Multi-wavelength output laser and implementation method thereof

Abstract

The invention discloses a multi-wavelength output laser and an implementation method thereof. According to the invention, a fundamental frequency laser is adopted to output fundamental frequency light of which the wavelength is the fundamental frequency wavelength, and the output of multiple wavelengths is realized through the combination of the second wavelength module and the third module; the lens is adopted to modulate the divergence angle of the laser with the second wavelength and the divergence angle of the laser with the third wavelength, so that the directivity and the divergence angle of the output laser with different wavelengths are the same, and the light with different wavelengths is ensured to have the same position and the same focusing performance after entering the light guide arm and acting on the application terminal; according to the invention, various lasers with different wavelengths can be provided according to needs, and a plurality of lasers do not need to be prepared; according to the invention, the cost is saved while a plurality of lasers with different wavelengths are provided, and great convenience is brought to a user in use.

Description

Technical Field

[0001] The invention relates to the field of lasers, and in particular to a multi-wavelength output laser and a realization method thereof. Background Art

[0002] Selective photothermal effect is the process of interaction after laser is absorbed by tissue, and also refers to the expected purpose of the effect on a specific target. Because selective photothermal effect ultimately applies laser energy directly to the treatment target, such as melanosomes, hemoglobin, water molecules or fat in the skin, causing necrosis of the target tissue without causing damage to adjacent normal tissue. Therefore, doctors hope to choose different wavelengths for targeted treatment according to different diseases. At present, most of the existing medical lasers are single wavelength, which cannot meet the needs of doctors for actual treatment. Summary of the invention

[0003] In view of the problems existing in the above prior art, the present invention proposes a multi-wavelength output laser and its implementation method. The laser output by the multi-wavelength output laser acts on the application terminal after passing through the light guide arm, and multiple wavelengths share the light guide arm. The directivity and divergence angle of the lasers of different wavelengths output by the multi-wavelength output laser of the present invention are the same, so that the positions of the light of different wavelengths acting on the application terminal after entering the light guide arm are the same, and the focusing performance is the same.

[0004] An object of the present invention is to provide a multi-wavelength output laser, wherein the second wavelength module adopts a laser cavity, a parametric oscillator cavity or a white light generation and amplification module.

[0005] The second wavelength module adopts a laser cavity. The multi-wavelength output laser of the present invention comprises: a fundamental frequency laser, a second wavelength module, a second wavelength moving device, a third wavelength module, a third wavelength moving device and a controller; wherein the fundamental frequency wavelength of the fundamental frequency light output by the fundamental frequency laser is λ1, the second wavelength output by the second wavelength module is λ2, the third wavelength output by the third wavelength module is λ3, λ2=2×λ3, λ1<λ3<λ2; the second wavelength module is placed on the second wavelength moving device as a whole; the third wavelength module is placed on the third wavelength moving device as a whole; the controller is respectively connected to the fundamental frequency laser, the second wavelength moving device and the third wavelength moving device; the controller controls the output laser energy of the fundamental frequency laser, and the controller independently controls the second wavelength moving device and the third wavelength moving device, so that the second wavelength module and the third wavelength module are moved into or out of the optical path as needed;

[0006] The second wavelength module adopts a laser cavity, and the second wavelength module includes a first lens, a first mirror, a first laser gain medium, a second mirror and a second lens; wherein the first lens is highly transparent to the fundamental wavelength λ1 output by the fundamental frequency laser, the laser cavity starting wavelength is the second wavelength λ2, and the second lens is highly transparent to the second wavelength λ2; the first mirror, the second mirror and the first laser gain medium form a resonant cavity, the first laser gain medium is located in the resonant cavity formed by the first mirror and the second mirror, the first mirror is highly transparent to the fundamental wavelength λ1, and highly reflective to the laser cavity starting wavelength, and the second mirror partially reflects the laser cavity starting wavelength;

[0007] When the second wavelength module is moved into the optical path, the fundamental frequency laser outputs fundamental frequency light with a wavelength of fundamental frequency wavelength λ1, which is transmitted to the second wavelength module; the first lens focuses the fundamental frequency light onto the first laser gain medium; the fundamental frequency light passes through the first lens and is focused onto the first laser gain medium to store energy for the first laser gain medium, and the resonant cavity composed of the first lens, the first laser gain medium and the second lens is started to output laser light with the laser cavity starting wavelength, which is output through the second lens; the second lens modulates the divergence angle of the laser light with a second wavelength λ2 output by the second lens, and by selecting a suitable focal length of the second lens, the divergence angle of the laser light with a wavelength of the second wavelength λ2 is made the same as the divergence angle of the fundamental frequency light with a wavelength of the fundamental frequency wavelength λ1 output by the fundamental frequency laser; the laser light with a wavelength of the second wavelength λ2 is output after passing through the second lens;

[0008] The third wavelength module includes a third lens, a first frequency doubling crystal, a fourth lens, a third lens and a light blocking block; the third lens has high transmittance to the second wavelength λ2; the fourth lens has high transmittance to the third wavelength λ3; the third lens has high reflection to the second wavelength λ2 and high transmittance to the third wavelength λ3;

[0009] When the third wavelength module is moved into the optical path, the laser with the second wavelength λ2 output by the second wavelength module goes to the third wavelength module; the third lens focuses the laser with the second wavelength λ2 output by the second wavelength module into the first frequency doubling crystal, doubles the wavelength of the laser with the second wavelength λ2, and generates doubled light with the third wavelength λ3, and the doubled light generated at this time is divergent; the fourth lens collimates the doubled light and modulates the divergence angle of the laser with the third wavelength λ3 output from the first frequency doubling crystal at the same time. By selecting a suitable focal length of the fourth lens, the divergence angle of the laser with the third wavelength λ3 output by the third wavelength module is the same as the divergence angle of the fundamental frequency light with the fundamental frequency wavelength λ1 output by the fundamental frequency laser, and the laser output characteristics are the same; the laser after passing through the fourth lens goes to the third lens, and the third lens separates the laser with the third wavelength λ3 from the laser with the second wavelength λ2 output by the second wavelength module, the laser with the second wavelength λ2 is reflected by the third lens and enters the light blocking block, and the laser with the third wavelength λ3 is transmitted by the third lens and then output.

[0010] The third lens is coated to make it highly reflective to the second wavelength λ2, with a reflectivity greater than 99%, and a transmittance greater than 99% to the second wavelength λ2. The reflectivity of the second lens to the second wavelength λ2 is greater than 70% and less than 98%. The transmittance of the first lens to the fundamental wavelength λ1 is greater than 90%, and the reflectivity to the second wavelength λ2 is greater than 99%. The transmittance of the first lens to the fundamental wavelength λ1 output by the fundamental laser is greater than 90%; the transmittance of the second lens to the second wavelength λ2 is greater than 90%.

[0011] The optical parametric oscillator cavity is adopted, and the multi-wavelength output laser of the present invention comprises: a fundamental frequency laser, a second wavelength module, a third wavelength module, a second wavelength moving device, a third wavelength moving device and a controller; wherein the fundamental frequency wavelength of the fundamental frequency light output by the fundamental frequency laser is λ1, the second wavelength output by the second wavelength module is λ2, the third wavelength output by the third wavelength module is λ3, λ2=2×λ3, λ2>λ1 or λ2<λ1; the second wavelength module and the third module are respectively placed on the second wavelength moving device and the third wavelength moving device; the controller is respectively connected to the fundamental frequency laser, the second wavelength moving device and the third wavelength moving device, the controller controls the output laser energy of the fundamental frequency laser, and the controller controls the second wavelength moving device and the third wavelength moving device respectively, so that the second wavelength module and the third module are respectively moved into or out of the optical path as required;

[0012] The second wavelength module adopts an optical parametric oscillator cavity, and the second wavelength module includes a fifth lens, a fourth lens, a parametric crystal, a fifth lens and a sixth lens; wherein the fifth lens has high transmittance to the fundamental frequency light output by the fundamental frequency laser; the fourth lens, the parametric crystal and the fifth lens form a resonant cavity, the parametric crystal is located between the fourth lens and the fifth lens, the fourth lens has high transmittance to the fundamental frequency wavelength λ1, and high reflection to the starting wavelength of the optical parametric oscillator cavity, and the fifth lens partially reflects the starting wavelength of the optical parametric oscillator cavity; the distance between the fourth lens and the fifth lens, i.e., the cavity length of the resonant cavity is less than 2m, ensuring that no synchronous pumping is required under a pulse width pump of 0.1 to 100ns; the sixth lens has high transmittance to the starting wavelength of the optical parametric oscillator cavity;

[0013] When the second wavelength module is moved into the optical path, the fundamental frequency laser outputs fundamental frequency light of fundamental frequency wavelength λ1 and transmits it to the fifth lens; the fifth lens focuses the frequency-doubled light onto the parametric crystal, and the resonant cavity composed of the fourth lens, the parametric crystal and the fifth lens is started to output the laser of the starting wavelength of the optical parametric oscillator cavity, and the starting wavelength of the optical parametric oscillator cavity is the second wavelength λ2, which is output through the fifth lens; the sixth lens modulates the divergence angle of the laser of the second wavelength λ2 output by the fifth lens, and by selecting a suitable focal length of the sixth lens, the divergence angle of the laser of the second wavelength λ2 output by the fifth lens is the same as the divergence angle of the fundamental frequency light output by the fundamental frequency laser, and the laser of the second wavelength λ2 is output after passing through the sixth lens;

[0014] The third wavelength module includes a third lens, a first frequency doubling crystal, a fourth lens, a third lens and a light blocking block; the third lens has high transmittance to the second wavelength λ2; the fourth lens has high transmittance to the third wavelength λ3; the third lens has high reflection to the second wavelength λ2 and high transmittance to the third wavelength λ3;

[0015] When the third wavelength module is moved into the optical path, the laser with the second wavelength λ2 output by the second wavelength module goes to the third wavelength module; the third lens focuses the laser with the second wavelength output by the second wavelength module into the first frequency doubling crystal, doubles the frequency of the laser with the second wavelength λ2, and generates doubled frequency light with the third wavelength λ3, and the doubled frequency light generated at this time is divergent; the fourth lens collimates the doubled frequency light and modulates the divergence angle of the laser with the third wavelength λ3 output from the first frequency doubling crystal at the same time, and by selecting a suitable focal length of the fourth lens, the divergence angle of the laser with the third wavelength λ3 output by the third wavelength module is the same as the divergence angle of the fundamental frequency light with the fundamental frequency wavelength λ1 output by the fundamental frequency laser, and the laser output characteristics are the same; the laser after passing through the fourth lens goes to the third lens, and the third lens separates the laser with the third wavelength λ3 from the laser with the second wavelength λ2 output by the second wavelength module, the laser with the second wavelength λ2 is reflected by the third lens and enters the light blocking block, and the laser with the third wavelength λ3 is transmitted by the third lens and then output.

[0016] The fundamental frequency laser is a Q-switched laser with a central wavelength of 1064nm, which outputs 0.1-100ns laser pulses. The 1064nm laser is used as the pump source of the optical parametric oscillator cavity, which can further generate lasers with wavelengths greater than 1064nm or less than 1064nm. The laser with strong output from the optical parametric oscillator further changes its wavelength after passing through the third wavelength module.

[0017] The transmittance of the fourth lens to the fundamental wavelength λ1 is greater than 90%, and the reflectance to the starting wavelength of the optical parametric oscillator cavity is greater than 99%. The reflectance of the fifth lens to the starting wavelength of the optical parametric oscillator cavity is greater than 70% and less than 98%. The transmittance of the sixth lens to the starting wavelength of the optical parametric oscillator cavity is greater than 99%. The transmittance of the fifth lens to the fundamental frequency light output by the fundamental frequency laser is greater than 99%.

[0018] The parameter crystal adopts BBO crystal.

[0019] The second wavelength module adopts a white light generation and amplification module. The multi-wavelength output laser of the present invention comprises: a fundamental frequency laser, a second wavelength module, a third wavelength module, a second wavelength moving device, a third wavelength moving device and a controller; wherein the fundamental frequency wavelength of the fundamental frequency light output by the fundamental frequency laser is λ1, the second wavelength output by the second wavelength module is λ2, the third wavelength output by the third wavelength module is λ3, λ2=2×λ3, λ2>λ1 or λ2<λ1; the second wavelength module and the third wavelength module are respectively placed on the second wavelength moving device and the third wavelength moving device; the controller is respectively connected to the fundamental frequency laser, the second wavelength moving device and the third wavelength moving device, the controller controls the output laser energy of the fundamental frequency laser, and the controller controls the second wavelength moving device and the third wavelength moving device respectively, so that the second wavelength module and the third wavelength module are respectively moved into or out of the optical path as needed;

[0020] The second wavelength module adopts a white light generation and amplification module, and the second wavelength module includes a beam splitter, a first reflector, a second reflector, a seventh lens, an eighth lens, a ninth lens, a white light generation crystal, a second frequency doubling crystal and a second laser gain medium; wherein the reflection of the beam splitter is less than the transmission; the first lens has high transmittance to the fundamental frequency light, the amplified wavelength of the second laser gain medium is the second wavelength λ2, and the second lens has high transmittance to the second wavelength λ2; the long-wave cutoff wavelength of the output wavelength of the white light generation crystal is greater than 1600nm;

[0021] When the second wavelength module is moved into the optical path, the fundamental frequency laser outputs fundamental frequency light of fundamental frequency wavelength λ1 which is input into the second wavelength module; after being split by the beam splitter of the second wavelength module, most of the light is transmitted and a small part of the light is reflected; the laser light transmitted by the beam splitter is focused onto the white light generating crystal by the seventh lens, and the laser light undergoes self-phase modulation in the white light generating crystal, and the laser spectrum is greatly broadened; the laser light after passing through the white light generating crystal is focused onto the second frequency doubling crystal by the eighth lens; after passing through the second frequency doubling crystal, the laser light with a wavelength of the second wavelength λ2 is injected into the second laser gain medium; the laser light reflected by the beam splitter is focused onto the white light generating crystal by the eighth lens; the laser light reflected by the beam splitter is focused onto the second frequency doubling crystal by the eighth lens; the laser light reflected by the beam splitter is injected into the second laser gain medium .... After passing through the first reflector and the second reflector, the light is used as a pump for the gain medium, and the laser light with a wavelength of the second wavelength λ2 injected into the second laser gain medium is amplified to obtain laser light with energy multiplied; the ninth lens modulates the divergence angle of the laser light with a wavelength of the second wavelength λ2 output by the second laser gain medium, and by selecting a suitable focal length of the ninth lens to modulate the divergence angle, the divergence angle of the laser light with a wavelength of the second wavelength λ2 output by the second laser gain medium is the same as the divergence angle of the fundamental frequency light with a wavelength of the fundamental frequency wavelength λ1 output by the fundamental frequency laser, and the laser light with a wavelength of the second wavelength λ2 is output after passing through the ninth lens;

[0022] The third wavelength module includes a third lens, a first frequency doubling crystal, a fourth lens, a third lens and a light blocking block; the third lens has high transmittance to the second wavelength λ2; the fourth lens has high transmittance to the third wavelength λ3; the third lens has high reflection to the second wavelength λ2 and high transmittance to the third wavelength λ3;

[0023] When the third wavelength module is moved into the optical path, the laser with the second wavelength λ2 output by the second wavelength module goes to the third wavelength module; the third lens focuses the laser with the second wavelength output by the second wavelength module into the first frequency doubling crystal, doubles the frequency of the laser with the second wavelength λ2, and generates doubled frequency light with the third wavelength λ3, and the doubled frequency light generated at this time is divergent; the fourth lens collimates the doubled frequency light and modulates the divergence angle of the laser with the third wavelength λ3 output from the first frequency doubling crystal at the same time, and by selecting a suitable focal length of the fourth lens, the divergence angle of the laser with the third wavelength λ3 output by the third wavelength module is the same as the divergence angle of the fundamental frequency light with the fundamental frequency wavelength λ1 output by the fundamental frequency laser, and the laser output characteristics are the same; the laser after passing through the fourth lens goes to the third lens, and the third lens separates the laser with the third wavelength λ3 from the laser with the second wavelength λ2 output by the second wavelength module, the laser with the second wavelength λ2 is reflected by the third lens and enters the light blocking block, and the laser with the third wavelength λ3 is transmitted by the third lens and then output.

[0024] The reflection to transmission ratio of the beam splitter is greater than 1:10 and less than 2:10.

[0025] The fundamental frequency laser is a Q-switched laser with a central wavelength of 1064nm, outputting a laser pulse of 0.1 to 100ns. The second wavelength is 1400≤λ2≤1800nm. The third wavelength is 700≤λ3≤900nm.

[0026] When the laser leaves the factory, the power supply voltage corresponding to the different output energies of the baseband laser is recorded in the controller; the second wavelength module is placed in the optical path, and the power supply voltage of the baseband laser corresponding to the different output energies of the second wavelength module is recorded in the controller. The second wavelength module is placed in the optical path, and the third wavelength module is placed in the optical path at the same time, and the power supply voltage of the baseband laser corresponding to the different output energies of the third wavelength module is recorded in the controller.

[0027] The second wavelength moving device and the third wavelength moving device adopt a one-dimensional displacement platform.

[0028] The controller is connected to the power supply of the fundamental frequency laser and controls the output laser energy by controlling the power supply voltage of the fundamental frequency laser.

[0029] The second laser gain medium is chromium-doped yttrium aluminum garnet (Cr:YAG).

[0030] Another object of the present invention is to provide a method for realizing a laser with multi-wavelength output.

[0031] The method for realizing a multi-wavelength output laser of the present invention, wherein the second wavelength module adopts a laser cavity, comprises the following steps:

[0032] 1. Output wavelength is fundamental frequency light with fundamental wavelength λ1:

[0033] 1) When the laser needs the fundamental wavelength λ1, the controller moves the second wavelength module and the third wavelength module out of the laser optical path by controlling the second wavelength moving device and the third wavelength moving device;

[0034] 2) The controller reads the power supply voltage data from the previously stored data, and the controller controls the power supply voltage of the baseband laser.

[0035] The energy required to make the laser output the fundamental wavelength λ1;

[0036] 2. Output wavelength of laser with second wavelength λ2:

[0037] 1) When the laser needs the second wavelength λ2, the controller controls the second wavelength moving device to place the second wavelength module into the optical path, and controls the third wavelength moving device to move the third wavelength module out of the optical path;

[0038] 2) The controller reads the power supply voltage data from the previously stored data, and controls the power supply voltage of the baseband laser so that the laser outputs the energy required for the wavelength λ2;

[0039] 3) The fundamental frequency laser outputs fundamental frequency light of fundamental frequency wavelength λ1, which is transmitted to the second wavelength module;

[0040] 4) The first lens focuses the fundamental frequency light onto the first laser gain medium;

[0041] 5) The fundamental frequency light passes through the first lens and is focused onto the first laser gain medium to store energy in the first laser gain medium. The resonant cavity composed of the first lens, the first laser gain medium and the second lens is started to output a laser with a starting wavelength of the laser cavity. The starting wavelength of the laser cavity is the second wavelength λ2, which is output through the second lens;

[0042] 6) The second lens modulates the divergence angle of the laser with the second wavelength λ2 output by the second lens, and by selecting a suitable focal length of the second lens, the divergence angle of the laser with the second wavelength λ2 is made the same as the divergence angle of the fundamental frequency light with the fundamental frequency wavelength λ1 output by the fundamental frequency laser; the laser with the second wavelength λ2 is output after passing through the second lens;

[0043] 3. Outputting a laser with a third wavelength λ3:

[0044] 1) When the laser needs a third wavelength λ3, the controller places the second wavelength module and the third wavelength module into the optical path by controlling the first and second moving devices;

[0045] 2) The controller reads the power supply voltage data from the previously stored data, and controls the power supply voltage of the baseband laser so that the laser outputs the energy required for the wavelength λ3;

[0046] 3) The fundamental frequency laser outputs fundamental frequency light of fundamental frequency wavelength λ1 and transmits it to the second wavelength module, and the second wavelength module outputs laser of second wavelength λ2 to the third wavelength module;

[0047] 4) The third lens focuses the laser with the second wavelength output by the second wavelength module into the first frequency doubling crystal;

[0048] 5) The first frequency doubling crystal doubles the frequency of the laser with the second wavelength λ2 to generate a frequency doubling light with the third wavelength λ3. The frequency doubling light generated at this time is divergent;

[0049] 6) The fourth lens collimates the doubled frequency light and modulates the divergence angle of the laser with the third wavelength λ3 output from the first doubled frequency crystal. By selecting a suitable focal length of the fourth lens, the divergence angle of the laser with the third wavelength λ3 output from the third wavelength module is the same as the divergence angle of the fundamental frequency light with the fundamental wavelength λ1 output from the fundamental frequency laser, and the laser output characteristics are the same;

[0050] 7) The laser after passing through the fourth lens reaches the third lens, and the third lens separates the laser with a wavelength of the third wavelength λ3 from the laser with a wavelength of the second wavelength λ2 output by the second wavelength module. The laser with the second wavelength λ2 is reflected by the third lens and enters the light blocking block, and the laser with a wavelength of the third wavelength λ3 is transmitted through the third lens and then output.

[0051] The method for realizing a multi-wavelength output laser of the present invention, wherein the second wavelength module adopts an optical parametric oscillator cavity, comprises the following steps:

[0052] 1. Output wavelength is fundamental frequency light with fundamental wavelength λ1:

[0053] 1) When the laser needs the fundamental wavelength λ1, the controller moves the second wavelength module and the third wavelength module out of the laser optical path by controlling the second wavelength moving device and the third wavelength moving device;

[0054] 2) The controller reads the power supply voltage data from the previously stored data, and the controller controls the power supply voltage of the baseband laser.

[0055] The energy required to make the laser output the fundamental wavelength λ1;

[0056] 2. Outputting a laser with a second wavelength λ2:

[0057] 1) When the laser needs the second wavelength λ2, the controller places the second wavelength module into the optical path by controlling the second wavelength moving device, and moves the third wavelength module out of the optical path by controlling the third wavelength moving device;

[0058] 2) The controller reads the power supply voltage data from the previously stored data, and controls the power supply voltage of the baseband laser so that the laser outputs the energy required for the wavelength λ2;

[0059] 3) The fundamental frequency laser outputs fundamental frequency light of fundamental frequency wavelength λ1 and transmits it to the second wavelength module;

[0060] 4) The fifth lens focuses the frequency-doubled light onto the parametric crystal;

[0061] 5) The resonant cavity composed of the fourth lens, the parametric crystal and the fifth lens is started to output a laser with the starting wavelength of the optical parametric oscillator cavity, and the starting wavelength of the optical parametric oscillator cavity is the second wavelength λ2, which is output through the fifth lens;

[0062] 6) The sixth lens modulates the divergence angle of the laser with the second wavelength λ2 output by the fifth lens. By selecting a suitable focal length of the sixth lens, the divergence angle of the laser with the second wavelength λ2 output by the fifth lens is made the same as the divergence angle of the fundamental frequency light output by the fundamental frequency laser, and the laser with the second wavelength λ2 is output after passing through the sixth lens;

[0063] 3. Outputting a laser with a third wavelength λ3:

[0064] 1) When the laser needs a third wavelength λ3, the controller places the second wavelength module and the third wavelength module into the optical path by controlling the first and second moving devices;

[0065] 2) The controller reads the power supply voltage data from the previously stored data, and controls the power supply voltage of the baseband laser so that the laser outputs the energy required for the wavelength λ3;

[0066] 3) The fundamental frequency laser outputs fundamental frequency light of fundamental frequency wavelength λ1 and transmits it to the second wavelength module, and the second wavelength module outputs laser of second wavelength λ2 to the third wavelength module;

[0067] 4) The third lens focuses the laser with the second wavelength output by the second wavelength module into the first frequency doubling crystal, doubles the frequency of the laser with the second wavelength λ2, and generates frequency doubling light with the third wavelength λ3. At this time, the frequency doubling light generated is divergent;

[0068] 5) The fourth lens collimates the doubled frequency light and modulates the divergence angle of the laser with the third wavelength λ3 output from the first doubled frequency crystal. By selecting a suitable focal length of the fourth lens, the divergence angle of the laser with the third wavelength λ3 output from the third wavelength module is the same as the divergence angle of the fundamental frequency light with the fundamental frequency wavelength λ1 output from the fundamental frequency laser, and the laser output characteristics are the same;

[0069] 6) The laser after passing through the fourth lens reaches the third lens, and the third lens separates the laser with a wavelength of the third wavelength λ3 from the laser with a wavelength of the second wavelength λ2 output by the second wavelength module. The laser with the second wavelength λ2 is reflected by the third lens and enters the light blocking block, and the laser with a wavelength of the third wavelength λ3 is transmitted through the third lens and then output.

[0070] The method for realizing a multi-wavelength output laser of the present invention, wherein the second wavelength module adopts a white light generating and amplifying module, comprises the following steps:

[0071] 1. Output wavelength is fundamental frequency light with fundamental wavelength λ1:

[0072] 1) When the laser needs the fundamental wavelength λ1, the controller moves the second wavelength module and the third wavelength module out of the laser optical path by controlling the second wavelength moving device and the third wavelength moving device;

[0073] 2) The controller reads the power supply voltage data from the previously stored data, and the controller controls the power supply voltage of the baseband laser.

[0074] The energy required to make the laser output the fundamental wavelength λ1;

[0075] 2. Output wavelength of laser with second wavelength λ2:

[0076] 1) When the laser needs the second wavelength λ2, the controller places the second wavelength module into the optical path by controlling the second wavelength moving device, and moves the third wavelength module out of the optical path by controlling the third wavelength moving device;

[0077] 2) The controller reads the power supply voltage data from the previously stored data, and controls the power supply voltage of the baseband laser so that the laser outputs the energy required for the wavelength λ2;

[0078] 3) The fundamental frequency laser outputs fundamental frequency light of fundamental frequency wavelength λ1 and transmits it to the second wavelength module;

[0079] 4) After being split by the beam splitter of the second wavelength module, most of the light is transmitted and a small part of the light is reflected;

[0080] 5) After being transmitted through the beam splitter, the laser is focused onto the white light generating crystal through the seventh lens, and the laser undergoes self-phase modulation in the white light generating crystal, and the laser spectrum is greatly broadened;

[0081] 6) The laser after passing through the white light generating crystal is focused into the second frequency doubling crystal through the eighth lens;

[0082] 7) After passing through the second frequency doubling crystal, the laser having a second wavelength λ2 is injected into the second laser gain medium;

[0083] 8) The laser reflected by the beam splitter passes through the first reflector and the second reflector and is used as a pump for the gain medium to amplify the laser with a wavelength of the second wavelength λ2 injected into the second laser gain medium to obtain energy-multiplied laser;

[0084] 9) the ninth lens modulates the divergence angle of the laser light with the second wavelength λ2 output by the second laser gain medium. By selecting a suitable focal length of the ninth lens to modulate the divergence angle, the divergence angle of the laser light with the second wavelength λ2 output by the second laser gain medium is the same as the divergence angle of the fundamental frequency light with the fundamental frequency wavelength λ1 output by the fundamental frequency laser. The laser light with the second wavelength λ2 is output after passing through the ninth lens.

[0085] 3. Outputting a laser with a third wavelength λ3:

[0086] 1) When the laser needs a third wavelength λ3, the controller places the second wavelength module and the third wavelength module into the optical path by controlling the first and second moving devices;

[0087] 2) The controller reads the power supply voltage data from the previously stored data, and controls the power supply voltage of the baseband laser so that the laser outputs the energy required for the wavelength λ3;

[0088] 3) The fundamental frequency laser outputs fundamental frequency light of fundamental frequency wavelength λ1 and transmits it to the second wavelength module, and the second wavelength module outputs laser of second wavelength λ2 to the third wavelength module;

[0089] 4) The third lens focuses the laser with the second wavelength output by the second wavelength module into the first frequency doubling crystal;

[0090] 5) The first frequency doubling crystal doubles the frequency of the laser with the second wavelength λ2 to generate a frequency doubling light with the third wavelength λ3. The frequency doubling light generated at this time is divergent;

[0091] 6) The fourth lens collimates the doubled frequency light and modulates the divergence angle of the laser with the third wavelength λ3 output from the first doubled frequency crystal. By selecting a suitable focal length of the fourth lens, the divergence angle of the laser with the third wavelength λ3 output from the third wavelength module is the same as the divergence angle of the fundamental frequency light with the fundamental wavelength λ1 output from the fundamental frequency laser, and the laser output characteristics are the same;

[0092] 7) The laser after passing through the fourth lens reaches the third lens, and the third lens separates the laser with a wavelength of the third wavelength λ3 from the laser with a wavelength of the second wavelength λ2 output by the second wavelength module. The laser with the second wavelength λ2 is reflected by the third lens and enters the light blocking block, and the laser with a wavelength of the third wavelength λ3 is transmitted through the third lens and then output.

[0093] Advantages of the present invention:

[0094] The present invention adopts a fundamental frequency laser to output fundamental frequency light with a wavelength being the fundamental frequency wavelength, and realizes the output of multiple wavelengths through the combination of a second wavelength module and a third module; and adopts a lens to modulate the divergence angles of the lasers of the second wavelength and the third wavelength, so that the directivity and divergence angles of the output lasers of different wavelengths are the same, thereby ensuring that the positions of the light of different wavelengths acting on the application terminal after entering the light guide arm are the same and the focusing performance is the same; the present invention can provide multiple lasers of different wavelengths respectively according to needs without preparing multiple lasers. While providing multiple lasers of different wavelengths, the present invention not only saves costs but also brings great convenience to users in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0095] Figure 1 A structural block diagram of an application of an embodiment of a multi-wavelength output laser of the present invention;

[0096] Figure 2 The overall structural block diagram of the multi-wavelength output laser of the present invention;

[0097] Figure 3 It is a structural block diagram of a second wavelength module of Embodiment 1 of the multi-wavelength output laser of the present invention;

[0098] Figure 4 It is a structural block diagram of the third wavelength module of the first embodiment of the multi-wavelength output laser of the present invention;

[0099] Figure 5 It is a structural block diagram of a second wavelength module of Embodiment 2 of a multi-wavelength output laser of the present invention;

[0100] Figure 6 It is a structural block diagram of the second wavelength module of the third embodiment of the multi-wavelength output laser of the present invention;

[0101] Figure 7 It is an overall schematic diagram of the first embodiment of the multi-wavelength output laser of the present invention. DETAILED DESCRIPTION

[0102] The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings.

[0103] like Figure 1As shown, the laser output by the multi-wavelength output laser of the present invention acts on the application terminal after passing through the light guide arm, and the two wavelengths share the light guide arm. The directivity and divergence angle of the lasers of different wavelengths output by the multi-wavelength output laser of the present invention are the same, so as to ensure that the positions of the light of different wavelengths acting on the application terminal are the same after entering the light guide arm, and the focusing performance is the same.

[0104] Embodiment 1

[0105] In this embodiment, the second wavelength module uses a laser cavity.

[0106] like Figure 2 and 7 As shown, the multi-wavelength output laser of this embodiment includes: a fundamental frequency laser, a second wavelength module, a second wavelength shifting device, a third wavelength module, a third wavelength shifting device and a controller; wherein, the fundamental frequency wavelength of the fundamental frequency light output by the fundamental frequency laser is λ1, the second wavelength output by the second wavelength module is λ2, the third wavelength output by the third wavelength module is λ3, λ2=2×λ3, λ1<λ3<λ2; the second wavelength module is placed on the second wavelength shifting device as a whole; the third wavelength module is placed on the third wavelength shifting device as a whole; the controller is respectively connected to the fundamental frequency laser, the second wavelength shifting device and the third wavelength shifting device; the controller controls the output laser energy of the fundamental frequency laser, and the controller independently controls the second wavelength shifting device and the third wavelength shifting device, so that the second wavelength module and the third wavelength module are moved into or out of the optical path as needed;

[0107] like Figure 3 As shown, the second wavelength module adopts a laser cavity, and the second wavelength module includes a first lens, a first mirror, a first laser gain medium, a second mirror and a second lens; wherein the first lens is highly transparent to the fundamental wavelength λ1 output by the fundamental frequency laser, the laser cavity starting wavelength is the second wavelength λ2, the laser cavity starting wavelength is twice the third wavelength λ3 output by the third wavelength module, and the second lens is highly transparent to the second wavelength λ2; the first mirror, the second mirror and the first laser gain medium form a resonant cavity, the first laser gain medium is located in the resonant cavity formed by the first mirror and the second mirror, the first mirror is highly transparent to the fundamental wavelength λ1, highly reflective to the laser cavity starting wavelength, and the second mirror partially reflects the laser cavity starting wavelength;

[0108] like Figure 4 As shown, the third wavelength module is a frequency doubling module, and the third wavelength module includes a third lens, a first frequency doubling crystal, a fourth lens, a third lens and a light blocking block; the third lens has high transmittance to the second wavelength λ2; the fourth lens has high transmittance to the third wavelength λ3; the third lens has high reflection to the second wavelength λ2 and high transmittance to the third wavelength λ3.

[0109] The method for implementing a multi-wavelength output laser of this embodiment, wherein the second wavelength module adopts a laser cavity, comprises the following steps:

[0110] 1. Output wavelength is fundamental frequency light with fundamental wavelength λ1:

[0111] 1) When the laser needs the fundamental wavelength λ1, the controller moves the second wavelength module and the third wavelength module out of the laser optical path by controlling the second wavelength moving device and the third wavelength moving device;

[0112] 2) The controller reads the power supply voltage data from the previously stored data, and the controller controls the power supply voltage of the baseband laser.

[0113] The energy required to make the laser output the fundamental wavelength λ1;

[0114] 2. Output wavelength of laser with second wavelength λ2:

[0115] 1) When the laser needs the second wavelength λ2, the controller controls the second wavelength moving device to place the second wavelength module into the optical path, and controls the third wavelength moving device to move the third wavelength module out of the optical path;

[0116] 2) The controller reads the power supply voltage data from the previously stored data, and controls the power supply voltage of the baseband laser so that the laser outputs the energy required for the wavelength λ2;

[0117] 3) The fundamental frequency laser outputs fundamental frequency light of fundamental frequency wavelength λ1, which is transmitted to the second wavelength module;

[0118] 4) The first lens focuses the fundamental frequency light onto the first laser gain medium;

[0119] 5) The fundamental frequency light passes through the first lens and is focused onto the first laser gain medium to store energy in the first laser gain medium. The resonant cavity composed of the first lens, the first laser gain medium and the second lens is started to output a laser with a starting wavelength of the laser cavity. The starting wavelength of the laser cavity is the second wavelength λ2, which is output through the second lens;

[0120] 6) The second lens modulates the divergence angle of the laser with the second wavelength λ2 output by the second lens, and by selecting a suitable focal length of the second lens, the divergence angle of the laser with the second wavelength λ2 is made the same as the divergence angle of the fundamental frequency light with the fundamental frequency wavelength λ1 output by the fundamental frequency laser; the laser with the second wavelength λ2 is output after passing through the second lens;

[0121] 3. Outputting a laser with a third wavelength λ3:

[0122] 1) When the laser needs a third wavelength λ3, the controller places the second wavelength module and the third wavelength module into the optical path by controlling the first and second moving devices;

[0123] 2) The controller reads the power supply voltage data from the previously stored data, and controls the power supply voltage of the baseband laser so that the laser outputs the energy required for the wavelength λ3;

[0124] 3) The fundamental frequency laser outputs fundamental frequency light of fundamental frequency wavelength λ1 and transmits it to the second wavelength module, and the second wavelength module outputs laser of second wavelength λ2 to the third wavelength module;

[0125] 4) The third lens focuses the laser light with the second wavelength outputted from the laser cavity into the first frequency doubling crystal;

[0126] 5) The first frequency doubling crystal doubles the frequency of the laser with the second wavelength λ2 to generate a frequency doubling light with the third wavelength λ3. The frequency doubling light generated at this time is divergent;

[0127] 6) The fourth lens collimates the doubled frequency light and modulates the divergence angle of the laser with the third wavelength λ3 output from the first doubled frequency crystal. By selecting a suitable focal length of the fourth lens, the divergence angle of the laser with the third wavelength λ3 output from the third wavelength module is the same as the divergence angle of the fundamental frequency light with the fundamental wavelength λ1 output from the fundamental frequency laser, and the laser output characteristics are the same;

[0128] 7) The laser after passing through the fourth lens reaches the third lens, and the third lens separates the laser with a wavelength of the third wavelength λ3 from the laser with a wavelength of the second wavelength λ2 output by the laser cavity. The laser with the second wavelength λ2 is reflected by the third lens and enters the light blocking block, and the laser with a wavelength of the third wavelength λ3 is transmitted through the third lens and then output.

[0129] Embodiment 2

[0130] In this embodiment, an optical parametric oscillator cavity is used.

[0131] The multi-wavelength output laser of the present embodiment comprises: a fundamental frequency laser, a second wavelength module, a third wavelength module, a second wavelength shifting device, a third wavelength shifting device and a controller; wherein the fundamental frequency wavelength of the fundamental frequency light output by the fundamental frequency laser is λ1, the second wavelength output by the second wavelength module is λ2, the third wavelength output by the third wavelength module is λ3, λ2=2×λ3, λ2>λ1 or λ2<λ1; the second wavelength module and the third module are respectively placed on the second wavelength shifting device and the third wavelength shifting device; the controller is respectively connected to the fundamental frequency laser, the second wavelength shifting device and the third wavelength shifting device, the controller controls the output laser energy of the fundamental frequency laser, and the controller controls the second wavelength shifting device and the third wavelength shifting device respectively, so that the second wavelength module and the third module are respectively moved into or out of the optical path as required;

[0132] like Figure 5As shown, the second wavelength module adopts an optical parametric oscillator cavity, and the second wavelength module includes a fifth lens, a fourth lens, a parametric crystal, a fifth lens and a sixth lens; wherein the fifth lens is highly transparent to the fundamental frequency light output by the fundamental frequency laser; the fourth lens, the parametric crystal and the fifth lens form a resonant cavity, the parametric crystal is located between the fourth lens and the fifth lens, the fourth lens is highly transparent to the fundamental frequency wavelength λ1, and highly reflective to the starting wavelength of the optical parametric oscillator cavity, and the fifth lens partially reflects the starting wavelength of the optical parametric oscillator cavity; the distance between the fourth lens and the fifth lens, that is, the cavity length of the resonant cavity is less than 2m, ensuring that no synchronous pumping is required under a pulse width pump of 0.1 to 100ns; the sixth lens is highly transparent to the starting wavelength of the optical parametric oscillator cavity.

[0133] The fundamental frequency laser is a Q-switched laser with a central wavelength of 1064nm, which outputs 0.1-100ns laser pulses. The 1064nm laser is used as the pump source of the optical parametric oscillator cavity, which can further generate lasers with wavelengths greater than 1064nm or less than 1064nm. The laser with strong output from the optical parametric oscillator further changes the laser wavelength after passing through the third wavelength module. The parametric crystal uses a BBO crystal.

[0134] The method for realizing a multi-wavelength output laser of this embodiment, wherein the second wavelength module adopts an optical parametric oscillator cavity, comprises the following steps:

[0135] 1. Output wavelength is fundamental frequency light with fundamental wavelength λ1:

[0136] 1) When the laser needs the fundamental wavelength λ1, the controller moves the second wavelength module and the third wavelength module out of the laser optical path by controlling the second wavelength moving device and the third wavelength moving device;

[0137] 2) The controller reads the power supply voltage data from the previously stored data, and the controller controls the power supply voltage of the baseband laser.

[0138] The energy required to make the laser output the fundamental wavelength λ1;

[0139] 2. Output wavelength of laser with second wavelength λ2:

[0140] 1) When the laser needs the second wavelength λ2, the controller places the second wavelength module into the optical path by controlling the second wavelength moving device, and moves the third wavelength module out of the optical path by controlling the third wavelength moving device;

[0141] 2) The controller reads the power supply voltage data from the previously stored data, and controls the power supply voltage of the baseband laser so that the laser outputs the energy required for the wavelength λ2;

[0142] 3) The fundamental frequency laser outputs fundamental frequency light of fundamental frequency wavelength λ1 and transmits it to the second wavelength module;

[0143] 4) The fifth lens focuses the frequency-doubled light onto the parametric crystal;

[0144] 5) The resonant cavity composed of the fourth lens, the parametric crystal and the fifth lens is started to output a laser with the starting wavelength of the optical parametric oscillator cavity, and the starting wavelength of the optical parametric oscillator cavity is the second wavelength λ2, which is output through the fifth lens;

[0145] 6) The sixth lens modulates the divergence angle of the laser with the second wavelength λ2 output by the fifth lens. By selecting a suitable focal length of the sixth lens, the divergence angle of the laser with the second wavelength λ2 output by the fifth lens is made the same as the divergence angle of the fundamental frequency light output by the fundamental frequency laser, and the laser with the second wavelength λ2 is output after passing through the sixth lens;

[0146] 3. Outputting a laser with a third wavelength λ3:

[0147] 1) When the laser needs a third wavelength λ3, the controller places the second wavelength module and the third wavelength module into the optical path by controlling the first and second moving devices;

[0148] 2) The controller reads the power supply voltage data from the previously stored data, and controls the power supply voltage of the baseband laser so that the laser outputs the energy required for the wavelength λ3;

[0149] 3) The fundamental frequency laser outputs fundamental frequency light of fundamental frequency wavelength λ1 and transmits it to the second wavelength module, and the second wavelength module outputs laser of second wavelength λ2 to the third wavelength module;

[0150] 4) The third lens focuses the laser with the second wavelength output by the optical parametric oscillator cavity into the first frequency doubling crystal, and frequency-doubles the laser with the second wavelength λ2 to generate frequency-doubled light with the third wavelength λ3. At this time, the frequency-doubled light generated is divergent.

[0151] 5) The fourth lens collimates the doubled frequency light and modulates the divergence angle of the laser with the third wavelength λ3 output from the first doubled frequency crystal. By selecting a suitable focal length of the fourth lens, the divergence angle of the laser with the third wavelength λ3 output from the third wavelength module is the same as the divergence angle of the fundamental frequency light with the fundamental frequency wavelength λ1 output from the fundamental frequency laser, and the laser output characteristics are the same;

[0152] 6) The laser after passing through the fourth lens reaches the third lens, and the third lens separates the laser with a wavelength of the third wavelength λ3 from the laser with a wavelength of the second wavelength λ2 output by the optical parametric oscillator cavity. The laser with the second wavelength λ2 is reflected by the third lens and enters the light blocking block, and the laser with a wavelength of the third wavelength λ3 is transmitted through the third lens and then output.

[0153] Embodiment 3

[0154] In this embodiment, the second wavelength module adopts a white light generating and amplifying module.

[0155] The multi-wavelength output laser of the present embodiment comprises: a fundamental frequency laser, a second wavelength module, a third wavelength module, a second wavelength shifting device, a third wavelength shifting device and a controller; wherein the fundamental frequency wavelength of the fundamental frequency light output by the fundamental frequency laser is λ1, the second wavelength output by the second wavelength module is λ2, the third wavelength output by the third wavelength module is λ3, λ2=2×λ3, λ2>λ1 or λ2<λ1; the white light generating and amplifying module and the third wavelength module are respectively placed on the second wavelength shifting device and the third wavelength shifting device; the controller is respectively connected to the fundamental frequency laser, the second wavelength shifting device and the third wavelength shifting device, the controller controls the output laser energy of the fundamental frequency laser, and the controller controls the second wavelength shifting device and the third wavelength shifting device respectively, so that the white light generating and amplifying module and the third wavelength module are respectively moved into or out of the optical path as required;

[0156] like Figure 6 As shown, the second wavelength module adopts a white light generating and amplifying module, and the second wavelength module includes a beam splitter, a first reflector, a second reflector, a seventh lens, an eighth lens, a ninth lens, a white light generating crystal, a second frequency doubling crystal and a second laser gain medium; wherein, the reflection of the beam splitter is less than the transmission; the first lens has high transmittance to the fundamental frequency light, the amplified wavelength of the second laser gain medium is the second wavelength λ2, and the second lens has high transmittance to the second wavelength λ2; the long-wave cutoff wavelength of the output wavelength of the white light generating crystal is greater than 1600nm.

[0157] The reflection and transmission ratio of the beam splitter is greater than 1:10 and less than 2:10. The fundamental frequency laser is a Q-switched laser with a central wavelength of 1064nm, outputting 0.1-100ns laser pulses. The second wavelength is 1400≤λ2≤1800nm. The third wavelength is 700≤λ3≤900nm. The second laser gain medium uses chromium-doped yttrium aluminum garnet (Cr:YAG).

[0158] The method for implementing a multi-wavelength output laser of this embodiment, wherein the second wavelength module adopts a white light generation and amplification module, comprises the following steps:

[0159] 1. Output wavelength is fundamental frequency light with fundamental wavelength λ1:

[0160] 1) When the laser needs the fundamental wavelength λ1, the controller moves the second wavelength module and the third wavelength module out of the laser optical path by controlling the second wavelength moving device and the third wavelength moving device;

[0161] 2) The controller reads the power supply voltage data from the previously stored data, and the controller controls the power supply voltage of the baseband laser.

[0162] The energy required to make the laser output the fundamental wavelength λ1;

[0163] 2. Outputting a laser with a second wavelength λ2:

[0164] 1) When the laser needs the second wavelength λ2, the controller places the second wavelength module into the optical path by controlling the second wavelength moving device, and moves the third wavelength module out of the optical path by controlling the third wavelength moving device;

[0165] 2) The controller reads the power supply voltage data from the previously stored data, and controls the power supply voltage of the baseband laser so that the laser outputs the energy required for the wavelength λ2;

[0166] 3) The fundamental frequency laser outputs fundamental frequency light of fundamental frequency wavelength λ1 and transmits it to the second wavelength module;

[0167] 4) After being split by the beam splitter of the second wavelength module, most of the light is transmitted and a small part of the light is reflected;

[0168] 5) After being transmitted through the beam splitter, the laser is focused onto the white light generating crystal through the seventh lens, and the laser undergoes self-phase modulation in the white light generating crystal, and the laser spectrum is greatly broadened;

[0169] 6) The laser after passing through the white light generating crystal is focused into the second frequency doubling crystal through the eighth lens;

[0170] 7) After passing through the second frequency doubling crystal, the laser having a second wavelength λ2 is injected into the second laser gain medium;

[0171] 8) The laser reflected by the beam splitter passes through the first reflector and the second reflector and is used as a pump for the gain medium to amplify the laser with a wavelength of the second wavelength λ2 injected into the second laser gain medium to obtain energy-multiplied laser;

[0172] 9) the ninth lens modulates the divergence angle of the laser light with the second wavelength λ2 output by the second laser gain medium. By selecting a suitable focal length of the ninth lens to modulate the divergence angle, the divergence angle of the laser light with the second wavelength λ2 output by the second laser gain medium is the same as the divergence angle of the fundamental frequency light with the fundamental frequency wavelength λ1 output by the fundamental frequency laser. The laser light with the second wavelength λ2 is output after passing through the ninth lens.

[0173] 3. Outputting a laser with a third wavelength λ3:

[0174] 1) When the laser needs a third wavelength λ3, the controller places the second wavelength module and the third wavelength module into the optical path by controlling the first and second moving devices;

[0175] 2) The controller reads the power supply voltage data from the previously stored data, and controls the power supply voltage of the baseband laser so that the laser outputs the energy required for the wavelength λ3;

[0176] 3) The fundamental frequency laser outputs fundamental frequency light of fundamental frequency wavelength λ1 and transmits it to the second wavelength module, and the second wavelength module outputs laser of second wavelength λ2 to the third wavelength module;

[0177] 4) The third lens focuses the laser with the second wavelength output by the white light generating and amplifying module into the first frequency doubling crystal;

[0178] 5) The first frequency doubling crystal doubles the frequency of the laser with the second wavelength λ2 to generate a frequency doubling light with the third wavelength λ3. The frequency doubling light generated at this time is divergent;

[0179] 6) The fourth lens collimates the doubled frequency light and modulates the divergence angle of the laser with the third wavelength λ3 output from the first doubled frequency crystal. By selecting a suitable focal length of the fourth lens, the divergence angle of the laser with the third wavelength λ3 output from the third wavelength module is the same as the divergence angle of the fundamental frequency light with the fundamental wavelength λ1 output from the fundamental frequency laser, and the laser output characteristics are the same;

[0180] 7) The laser after passing through the fourth lens reaches the third lens, and the third lens separates the laser with a wavelength of the third wavelength λ3 from the laser with a wavelength of the second wavelength λ2 output by the white light generating and amplifying module. The laser with the second wavelength λ2 is reflected by the third lens and enters the light blocking block, and the laser with a wavelength of the third wavelength λ3 is transmitted through the third lens and then output.

[0181] Finally, it should be noted that the purpose of publishing the embodiments is to help further understand the present invention, but those skilled in the art can understand that various substitutions and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the present invention should not be limited to the contents disclosed in the embodiments, and the scope of protection claimed by the present invention shall be subject to the scope defined in the claims.

Claims

1. A multi-wavelength output laser, the second wavelength module adopts a laser cavity, characterized in that: The multi-wavelength output laser comprises: a fundamental frequency laser, a second wavelength module, a second wavelength shifting device, a third wavelength module, a third wavelength shifting device and a controller; wherein the fundamental frequency wavelength of the fundamental frequency light output by the fundamental frequency laser is λ1, the second wavelength output by the second wavelength module is λ2, the third wavelength output by the third wavelength module is λ3, λ2=2×λ3, λ1<λ3<λ2; the second wavelength module is placed on the second wavelength shifting device as a whole; the third wavelength module is placed on the third wavelength shifting device as a whole; the controller is respectively connected to the fundamental frequency laser, the second wavelength shifting device and the third wavelength shifting device; the controller controls the output laser energy of the fundamental frequency laser, and the controller independently controls the second wavelength shifting device and the third wavelength shifting device, so that the second wavelength module and the third wavelength module are moved into or out of the optical path as needed; The second wavelength module adopts a laser cavity, and the second wavelength module includes a first lens, a first mirror, a first laser gain medium, a second mirror and a second lens; wherein the first lens is highly transparent to the fundamental wavelength λ1 output by the fundamental frequency laser, the laser cavity starting wavelength is the second wavelength λ2, and the second lens is highly transparent to the second wavelength λ2; the first mirror, the second mirror and the first laser gain medium form a resonant cavity, the first laser gain medium is located in the resonant cavity formed by the first mirror and the second mirror, the first mirror is highly transparent to the fundamental wavelength λ1, and highly reflective to the laser cavity starting wavelength, and the second mirror partially reflects the laser cavity starting wavelength; When the second wavelength module is moved into the optical path, the fundamental frequency laser outputs fundamental frequency light with a wavelength of fundamental frequency wavelength λ1, which is transmitted to The second wavelength module; the first lens focuses the fundamental frequency light onto the first laser gain medium; the fundamental frequency light passes through the first lens and is focused onto the first laser gain medium to store energy for the first laser gain medium, and the resonant cavity composed of the first lens, the first laser gain medium and the second lens is started to output the laser of the laser cavity starting wavelength, which is output through the second lens; the second lens modulates the divergence angle of the laser of the second wavelength λ2 output by the second lens, and by selecting a suitable focal length of the second lens, the divergence angle of the laser of the second wavelength λ2 is made the same as the divergence angle of the fundamental frequency light of the fundamental frequency wavelength λ1 output by the fundamental frequency laser; the laser of the second wavelength λ2 is output after passing through the second lens; The third wavelength module includes a third lens, a first frequency doubling crystal, a fourth lens, a third lens and a light blocking block; the third lens has high transmittance to the second wavelength λ2; the fourth lens has high transmittance to the third wavelength λ3; the third lens has high reflection to the second wavelength λ2 and high transmittance to the third wavelength λ3; When the third wavelength module is moved into the optical path, the laser with the second wavelength λ2 output by the second wavelength module goes to the third wavelength module; the third lens focuses the laser with the second wavelength λ2 output by the second wavelength module into the first frequency doubling crystal, doubles the wavelength of the laser with the second wavelength λ2, and generates doubled light with the third wavelength λ3, and the doubled light generated at this time is divergent; the fourth lens collimates the doubled light and modulates the divergence angle of the laser with the third wavelength λ3 output from the first frequency doubling crystal at the same time. By selecting a suitable focal length of the fourth lens, the divergence angle of the laser with the third wavelength λ3 output by the third wavelength module is the same as the divergence angle of the fundamental frequency light with the fundamental frequency wavelength λ1 output by the fundamental frequency laser, and the laser output characteristics are the same; the laser after passing through the fourth lens goes to the third lens, and the third lens separates the laser with the third wavelength λ3 from the laser with the second wavelength λ2 output by the second wavelength module, the laser with the second wavelength λ2 is reflected by the third lens and enters the light blocking block, and the laser with the third wavelength λ3 is transmitted by the third lens and then output.

2. A multi-wavelength output laser using an optical parametric oscillator cavity, characterized in that: The multi-wavelength output laser comprises: a fundamental frequency laser, a second wavelength module, a third wavelength module, a second wavelength moving device, a third wavelength moving device and a controller; wherein the fundamental frequency wavelength of the fundamental frequency light output by the fundamental frequency laser is λ1, the second wavelength output by the second wavelength module is λ2, the third wavelength output by the third wavelength module is λ3, λ2=2×λ3, λ2>λ1 or λ2<λ1; the second wavelength module and the third module are respectively placed on the second wavelength moving device and the third wavelength moving device; the controller is respectively connected to the fundamental frequency laser, the second wavelength moving device and the third wavelength moving device, the controller controls the output laser energy of the fundamental frequency laser, and the controller controls the second wavelength moving device and the third wavelength moving device respectively, so that the second wavelength module and the third module are respectively moved into or out of the optical path as needed; The second wavelength module adopts an optical parametric oscillator cavity, and the second wavelength module includes a fifth lens, a fourth lens, a parametric crystal, a fifth lens and a sixth lens; wherein the fifth lens has high transmittance to the fundamental frequency light output by the fundamental frequency laser; the fourth lens, the parametric crystal and the fifth lens form a resonant cavity, the parametric crystal is located between the fourth lens and the fifth lens, the fourth lens has high transmittance to the fundamental frequency wavelength λ1, and high reflection to the starting wavelength of the optical parametric oscillator cavity, and the fifth lens partially reflects the starting wavelength of the optical parametric oscillator cavity; the distance between the fourth lens and the fifth lens, i.e., the cavity length of the resonant cavity is less than 2m, ensuring that no synchronous pumping is required under a pulse width pump of 0.1 to 100ns; the sixth lens has high transmittance to the starting wavelength of the optical parametric oscillator cavity; When the second wavelength module is moved into the optical path, the fundamental frequency laser outputs fundamental frequency light of fundamental frequency wavelength λ1 and transmits it to the fifth lens; the fifth lens focuses the frequency-doubled light onto the parametric crystal, and the resonant cavity composed of the fourth lens, the parametric crystal and the fifth lens is started to output the laser of the starting wavelength of the optical parametric oscillator cavity, and the starting wavelength of the optical parametric oscillator cavity is the second wavelength λ2, which is output through the fifth lens; the sixth lens modulates the divergence angle of the laser of the second wavelength λ2 output by the fifth lens, and by selecting a suitable focal length of the sixth lens, the divergence angle of the laser of the second wavelength λ2 output by the fifth lens is the same as the divergence angle of the fundamental frequency light output by the fundamental frequency laser, and the laser of the second wavelength λ2 is output after passing through the sixth lens; The third wavelength module includes a third lens, a first frequency doubling crystal, a fourth lens, a third lens and a light blocking block; the third lens has high transmittance to the second wavelength λ2; the fourth lens has high transmittance to the third wavelength λ3; the third lens has high reflection to the second wavelength λ2 and high transmittance to the third wavelength λ3; When the third wavelength module is moved into the optical path, the laser with the second wavelength λ2 output by the second wavelength module goes to the third wavelength module; the third lens focuses the laser with the second wavelength output by the second wavelength module into the first frequency doubling crystal, doubles the frequency of the laser with the second wavelength λ2, and generates doubled frequency light with the third wavelength λ3, and the doubled frequency light generated at this time is divergent; the fourth lens collimates the doubled frequency light and modulates the divergence angle of the laser with the third wavelength λ3 output from the first frequency doubling crystal at the same time, and by selecting a suitable focal length of the fourth lens, the divergence angle of the laser with the third wavelength λ3 output by the third wavelength module is the same as the divergence angle of the fundamental frequency light with the fundamental frequency wavelength λ1 output by the fundamental frequency laser, and the laser output characteristics are the same; the laser after passing through the fourth lens goes to the third lens, and the third lens separates the laser with the third wavelength λ3 from the laser with the second wavelength λ2 output by the second wavelength module, the laser with the second wavelength λ2 is reflected by the third lens and enters the light blocking block, and the laser with the third wavelength λ3 is transmitted by the third lens and then output.

3. A multi-wavelength output laser, the second wavelength module adopts a white light generation and amplification module, characterized in that: The multi-wavelength output laser comprises: a fundamental frequency laser, a second wavelength module, a third wavelength module, a second wavelength moving device, a third wavelength moving device and a controller; wherein the fundamental frequency wavelength of the fundamental frequency light output by the fundamental frequency laser is λ1, the second wavelength output by the second wavelength module is λ2, the third wavelength output by the third wavelength module is λ3, λ2=2×λ3, λ2>λ1 or λ2<λ1; the second wavelength module and the third wavelength module are respectively placed on the second wavelength moving device and the third wavelength moving device; the controller is respectively connected to the fundamental frequency laser, the second wavelength moving device and the third wavelength moving device, the controller controls the output laser energy of the fundamental frequency laser, and the controller controls the second wavelength moving device and the third wavelength moving device respectively, so that the second wavelength module and the third wavelength module are respectively moved into or out of the optical path as needed; The second wavelength module adopts a white light generation and amplification module, and the second wavelength module includes a beam splitter, a first reflector, a second reflector, a seventh lens, an eighth lens, a ninth lens, a white light generation crystal, a second frequency doubling crystal and a second laser gain medium; wherein the reflection of the beam splitter is less than the transmission; the first lens has high transmittance to the fundamental frequency light, the amplified wavelength of the second laser gain medium is the second wavelength λ2, and the second lens has high transmittance to the second wavelength λ2; the long-wave cutoff wavelength of the output wavelength of the white light generation crystal is greater than 1600nm; When the second wavelength module is moved into the optical path, the fundamental frequency laser outputs fundamental frequency light of fundamental frequency wavelength λ1 which is input into the second wavelength module; after being split by the beam splitter of the second wavelength module, most of the light is transmitted and a small part of the light is reflected; the laser light transmitted by the beam splitter is focused onto the white light generating crystal by the seventh lens, and the laser light undergoes self-phase modulation in the white light generating crystal, and the laser spectrum is greatly broadened; the laser light after passing through the white light generating crystal is focused onto the second frequency doubling crystal by the eighth lens; after passing through the second frequency doubling crystal, the laser light with a wavelength of the second wavelength λ2 is injected into the second laser gain medium; the laser light reflected by the beam splitter is focused onto the white light generating crystal by the eighth lens; the laser light reflected by the beam splitter is focused onto the second frequency doubling crystal by the eighth lens; the laser light reflected by the beam splitter is injected into the second laser gain medium .... After passing through the first reflector and the second reflector, the light is used as a pump for the gain medium, and the laser light with a wavelength of the second wavelength λ2 injected into the second laser gain medium is amplified to obtain laser light with energy multiplied; the ninth lens modulates the divergence angle of the laser light with a wavelength of the second wavelength λ2 output by the second laser gain medium, and by selecting a suitable focal length of the ninth lens to modulate the divergence angle, the divergence angle of the laser light with a wavelength of the second wavelength λ2 output by the second laser gain medium is the same as the divergence angle of the fundamental frequency light with a wavelength of the fundamental frequency wavelength λ1 output by the fundamental frequency laser, and the laser light with a wavelength of the second wavelength λ2 is output after passing through the ninth lens; The third wavelength module includes a third lens, a first frequency doubling crystal, a fourth lens, a third lens and a light blocking block; the third lens has high transmittance to the second wavelength λ2; the fourth lens has high transmittance to the third wavelength λ3; the third lens has high reflection to the second wavelength λ2 and high transmittance to the third wavelength λ3; When the third wavelength module is moved into the optical path, the laser with the second wavelength λ2 output by the second wavelength module goes to the third wavelength module; the third lens focuses the laser with the second wavelength output by the second wavelength module into the first frequency doubling crystal, doubles the frequency of the laser with the second wavelength λ2, and generates doubled frequency light with the third wavelength λ3, and the doubled frequency light generated at this time is divergent; the fourth lens collimates the doubled frequency light and modulates the divergence angle of the laser with the third wavelength λ3 output from the first frequency doubling crystal at the same time, and by selecting a suitable focal length of the fourth lens, the divergence angle of the laser with the third wavelength λ3 output by the third wavelength module is the same as the divergence angle of the fundamental frequency light with the fundamental frequency wavelength λ1 output by the fundamental frequency laser, and the laser output characteristics are the same; the laser after passing through the fourth lens goes to the third lens, and the third lens separates the laser with the third wavelength λ3 from the laser with the second wavelength λ2 output by the second wavelength module, the laser with the second wavelength λ2 is reflected by the third lens and enters the light blocking block, and the laser with the third wavelength λ3 is transmitted by the third lens and then output.

4. The multi-wavelength output laser according to claim 1, 2 or 3, characterized in that: The third lens is coated to make it highly reflective to the laser cavity starting wavelength, with a reflectivity greater than 99%, and a transmittance greater than 99% to the second wavelength λ2; the reflectivity of the second lens to the laser cavity starting wavelength is greater than 70% and less than 98%; the transmittance of the first lens to the fundamental wavelength λ1 is greater than 90%, and the reflectivity to the laser cavity starting wavelength is greater than 99%.

5. The multi-wavelength output laser according to claim 2, characterized in that: The transmittance of the fourth lens to the fundamental wavelength λ1 is greater than 90%, and the reflectivity to the starting wavelength of the optical parametric oscillator cavity is greater than 99%. The reflectivity of the fifth lens to the starting wavelength of the optical parametric oscillator cavity is greater than 70% and less than 98%; The transmittance of the sixth lens to the starting wavelength of the optical parametric oscillator cavity is greater than 99%.

6. The multi-wavelength output laser according to claim 3, characterized in that: The fundamental frequency laser outputs 0.1-100ns laser pulses; the second wavelength is 1400≤λ2≤1800nm; and the third wavelength is 700≤λ3≤900nm.

7. The multi-wavelength output laser according to claim 3, characterized in that: The reflection to transmission ratio of the beam splitter is greater than 1:10 and less than 2:

10.

8. A method for realizing a multi-wavelength output laser as claimed in claim 1, wherein the second wavelength module adopts a laser cavity, characterized in that: The implementation method comprises the following steps:

1. Output wavelength is fundamental frequency light with fundamental wavelength λ1: 1) When the laser needs the fundamental wavelength λ1, the controller moves the second wavelength module and the third wavelength module out of the laser optical path by controlling the second wavelength moving device and the third wavelength moving device; 2) The controller reads the power supply voltage data from the previously stored data, and the controller controls the power supply voltage of the baseband laser. The energy required to make the laser output the fundamental wavelength λ1; 2. Outputting a laser with a second wavelength λ2: 1) When the laser needs the second wavelength λ2, the controller controls the second wavelength moving device to place the second wavelength module into the optical path, and controls the third wavelength moving device to move the third wavelength module out of the optical path; 2) The controller reads the power supply voltage data from the previously stored data, and controls the power supply voltage of the baseband laser so that the laser outputs the energy required for the wavelength λ2; 3) The fundamental frequency laser outputs fundamental frequency light of fundamental frequency wavelength λ1, which is transmitted to the second wavelength module; 4) The first lens focuses the fundamental frequency light onto the first laser gain medium; 5) The fundamental frequency light passes through the first lens and is focused onto the first laser gain medium to store energy in the first laser gain medium. The resonant cavity composed of the first lens, the first laser gain medium and the second lens is started to output a laser with a starting wavelength of the laser cavity. The starting wavelength of the laser cavity is the second wavelength λ2, which is output through the second lens; 6) The second lens modulates the divergence angle of the laser with the second wavelength λ2 output by the second lens, and by selecting a suitable focal length of the second lens, the divergence angle of the laser with the second wavelength λ2 is made the same as the divergence angle of the fundamental frequency light with the fundamental frequency wavelength λ1 output by the fundamental frequency laser; the laser with the second wavelength λ2 is output after passing through the second lens; 3. Outputting a laser with a third wavelength λ3: 1) When the laser needs a third wavelength λ3, the controller places the second wavelength module and the third wavelength module into the optical path by controlling the first and second moving devices; 2) The controller reads the power supply voltage data from the previously stored data, and controls the power supply voltage of the baseband laser so that the laser outputs the energy required for the wavelength λ3; 3) The fundamental frequency laser outputs fundamental frequency light of fundamental frequency wavelength λ1 and transmits it to the second wavelength module, and the second wavelength module outputs laser of second wavelength λ2 to the third wavelength module; 4) The third lens focuses the laser with the second wavelength output by the second wavelength module into the first frequency doubling crystal; 5) The first frequency doubling crystal doubles the frequency of the laser with the second wavelength λ2 to generate a frequency doubling light with the third wavelength λ3. The frequency doubling light generated at this time is divergent; 6) The fourth lens collimates the doubled frequency light and modulates the divergence angle of the laser with the third wavelength λ3 output from the first doubled frequency crystal. By selecting a suitable focal length of the fourth lens, the divergence angle of the laser with the third wavelength λ3 output from the third wavelength module is the same as the divergence angle of the fundamental frequency light with the fundamental wavelength λ1 output from the fundamental frequency laser, and the laser output characteristics are the same; 7) The laser after passing through the fourth lens reaches the third lens, and the third lens separates the laser with a wavelength of the third wavelength λ3 from the laser with a wavelength of the second wavelength λ2 output by the second wavelength module. The laser with the second wavelength λ2 is reflected by the third lens and enters the light blocking block, and the laser with a wavelength of the third wavelength λ3 is transmitted through the third lens and then output.

9. A method for realizing a multi-wavelength output laser as claimed in claim 2, wherein the second wavelength module adopts an optical parametric oscillator cavity, characterized in that: The implementation method comprises the following steps:

1. Output wavelength is fundamental frequency light with fundamental wavelength λ1: 1) When the laser needs the fundamental wavelength λ1, the controller moves the second wavelength module and the third wavelength module out of the laser optical path by controlling the second wavelength moving device and the third wavelength moving device; 2) The controller reads the power supply voltage data from the previously stored data, and the controller controls the power supply voltage of the baseband laser. The energy required to make the laser output the fundamental wavelength λ1; 2. Output wavelength of laser with second wavelength λ2: 1) When the laser needs the second wavelength λ2, the controller places the second wavelength module into the optical path by controlling the second wavelength moving device, and moves the third wavelength module out of the optical path by controlling the third wavelength moving device; 2) The controller reads the power supply voltage data from the previously stored data, and controls the power supply voltage of the baseband laser. The energy required to make the laser output wavelength λ2; 3) The fundamental frequency laser outputs fundamental frequency light of fundamental frequency wavelength λ1 and transmits it to the second wavelength module; 4) The fifth lens focuses the frequency-doubled light onto the parametric crystal; 5) The resonant cavity composed of the fourth lens, the parametric crystal and the fifth lens is started to output a laser with the starting wavelength of the optical parametric oscillator cavity, and the starting wavelength of the optical parametric oscillator cavity is the second wavelength λ2, which is output through the fifth lens; 6) The sixth lens modulates the divergence angle of the laser with the second wavelength λ2 output by the fifth lens. By selecting a suitable focal length of the sixth lens, the divergence angle of the laser with the second wavelength λ2 output by the fifth lens is made the same as the divergence angle of the fundamental frequency light output by the fundamental frequency laser, and the laser with the second wavelength λ2 is output after passing through the sixth lens; 3. Outputting a laser with a third wavelength λ3: 1) When the laser needs a third wavelength λ3, the controller places the second wavelength module and the third wavelength module into the optical path by controlling the first and second moving devices; 2) The controller reads the power supply voltage data from the previously stored data, and controls the power supply voltage of the baseband laser. The energy required to make the laser output wavelength λ3; 3) The fundamental frequency laser outputs fundamental frequency light of fundamental frequency wavelength λ1 and transmits it to the second wavelength module, and the second wavelength module outputs laser of second wavelength λ2 to the third wavelength module; 4) The third lens focuses the laser with the second wavelength output by the second wavelength module into the first frequency doubling crystal, doubles the frequency of the laser with the second wavelength λ2, and generates frequency doubling light with the third wavelength λ3. At this time, the frequency doubling light generated is divergent; 5) The fourth lens collimates the doubled frequency light and modulates the divergence angle of the laser with the third wavelength λ3 output from the first doubled frequency crystal. By selecting a suitable focal length of the fourth lens, the divergence angle of the laser with the third wavelength λ3 output from the third wavelength module is the same as the divergence angle of the fundamental frequency light with the fundamental frequency wavelength λ1 output from the fundamental frequency laser, and the laser output characteristics are the same; 6) The laser after passing through the fourth lens reaches the third lens, and the third lens separates the laser with a wavelength of the third wavelength λ3 from the laser with a wavelength of the second wavelength λ2 output by the second wavelength module. The laser with the second wavelength λ2 is reflected by the third lens and enters the light blocking block, and the laser with a wavelength of the third wavelength λ3 is transmitted through the third lens and then output.

10. A method for realizing a multi-wavelength output laser as claimed in claim 3, wherein the second wavelength module adopts a white light generation and amplification module, characterized in that: The implementation method comprises the following steps:

1. Output wavelength is fundamental frequency light with fundamental wavelength λ1: 1) When the laser needs the fundamental wavelength λ1, the controller moves the second wavelength module and the third wavelength module out of the laser optical path by controlling the second wavelength moving device and the third wavelength moving device; 2) The controller reads the power supply voltage data from the previously stored data, and the controller controls the power supply voltage of the baseband laser. The energy required to make the laser output the fundamental wavelength λ1; 2. Output wavelength of laser with second wavelength λ2: 1) When the laser needs the second wavelength λ2, the controller places the second wavelength module into the optical path by controlling the second wavelength moving device, and moves the third wavelength module out of the optical path by controlling the third wavelength moving device; 2) The controller reads the power supply voltage data from the previously stored data, and controls the power supply voltage of the baseband laser. The energy required to make the laser output wavelength λ2; 3) The fundamental frequency laser outputs fundamental frequency light of fundamental frequency wavelength λ1 and transmits it to the second wavelength module; 4) After being split by the beam splitter of the second wavelength module, most of the light is transmitted and a small part of the light is reflected; 5) After being transmitted through the beam splitter, the laser is focused onto the white light generating crystal through the seventh lens, and the laser undergoes self-phase modulation in the white light generating crystal, and the laser spectrum is greatly broadened; 6) The laser after passing through the white light generating crystal is focused into the second frequency doubling crystal through the eighth lens; 7) After passing through the second frequency doubling crystal, the laser having a second wavelength λ2 is injected into the second laser gain medium; 8) The laser reflected by the beam splitter passes through the first reflector and the second reflector and is used as a pump for the gain medium to amplify the laser with a wavelength of the second wavelength λ2 injected into the second laser gain medium to obtain energy-multiplied laser; 9) The ninth lens modulates the divergence angle of the laser light with the second wavelength λ2 output by the second laser gain medium, By selecting a suitable focal length of the ninth lens to modulate the divergence angle, the divergence angle of the laser light having the second wavelength λ2 output by the second laser gain medium is made the same as the divergence angle of the fundamental frequency light having the fundamental frequency wavelength λ1 output by the fundamental frequency laser, and the laser light having the second wavelength λ2 is output after passing through the ninth lens; 3. Outputting a laser with a third wavelength λ3: 1) When the laser needs a third wavelength λ3, the controller places the second wavelength module and the third wavelength module into the optical path by controlling the first and second moving devices; 2) The controller reads the power supply voltage data from the previously stored data, and controls the power supply voltage of the baseband laser so that the laser outputs the energy required for the wavelength λ3; 3) The fundamental frequency laser outputs fundamental frequency light of fundamental frequency wavelength λ1 and transmits it to the second wavelength module, and the second wavelength module outputs laser of second wavelength λ2 to the third wavelength module; 4) The third lens focuses the laser with the second wavelength output by the second wavelength module into the first frequency doubling crystal; 5) The first frequency doubling crystal doubles the frequency of the laser with the second wavelength λ2 to generate a frequency doubling light with the third wavelength λ3. The frequency doubling light generated at this time is divergent; 6) The fourth lens collimates the doubled frequency light and modulates the divergence angle of the laser with the third wavelength λ3 output from the first doubled frequency crystal. By selecting a suitable focal length of the fourth lens, the divergence angle of the laser with the third wavelength λ3 output from the third wavelength module is the same as the divergence angle of the fundamental frequency light with the fundamental wavelength λ1 output from the fundamental frequency laser, and the laser output characteristics are the same; 7) The laser after passing through the fourth lens reaches the third lens, and the third lens separates the laser with a wavelength of the third wavelength λ3 from the laser with a wavelength of the second wavelength λ2 output by the second wavelength module. The laser with the second wavelength λ2 is reflected by the third lens and enters the light blocking block, and the laser with a wavelength of the third wavelength λ3 is transmitted through the third lens and then output.

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