Three-wavelength output laser equipment and implementation method thereof

Abstract

The invention discloses three-wavelength output laser equipment and an implementation method thereof. According to the invention, a fundamental frequency laser is adopted to output fundamental frequency light with a fundamental frequency wavelength, a frequency multiplication module is adopted to multiply the fundamental frequency light into multiple frequency light, a first dichroic mirror and a second dichroic mirror are used in pairs, and the directivity of the frequency multiplication light and the fundamental frequency light after the frequency multiplication module is moved into a light path is ensured to be the same; the wavelength of the frequency-doubled light is converted into the oscillation-starting wavelength of the laser cavity through the laser cavity, the divergence angle of the frequency-doubled light is modulated by adopting the second lens, and the divergence angle of the laser of the oscillation-starting wavelength of the laser cavity is modulated by adopting the fourth lens, so that the directivity and the divergence angle of the output laser of different wavelengths are the same; therefore, after entering the light guide arm, the light with different wavelengths acts on the same position on the application terminal and has the same focusing performance. According to the invention, three kinds of lasers with different wavelengths can be respectively provided according to needs, and three lasers do not need to be prepared; according to the invention, the cost is reduced, and great convenience is brought to a user in use.

Description

Technical Field

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

[0002] In medical applications, different wavelengths are used to treat different lesions. Doctors choose different wavelengths for treatment according to different diseases. Currently, in order to use three different wavelength lasers, doctors need to prepare at least two lasers. Directly replacing lasers increases costs and is inconvenient for doctors to use. Summary of the invention

[0003] In view of the problems existing in the above prior art, the present invention proposes a three-wavelength output laser device and its implementation method. The laser output by the three-wavelength output laser device acts on the application terminal after passing through the light guide arm. The three wavelengths share the light guide arm. The lasers of different wavelengths output by the three-wavelength output laser device of the present invention have the same directivity and divergence angle, so that the light of different wavelengths enters the light guide arm and acts on the application terminal at the same position and has the same focusing performance.

[0004] An object of the present invention is to provide a laser device with triple-wavelength output.

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

[0006] The frequency doubling module includes a first lens, a frequency doubling crystal, a first dichroic mirror, a second dichroic mirror, a second lens and a light blocking block; wherein the first lens has high transmittance to the fundamental frequency light output by the fundamental frequency laser, and the second lens has high transmittance to the doubled frequency light; the first and second dichroic mirrors reflect the fundamental frequency light and transmit the doubled frequency light; the first dichroic mirror and the second dichroic mirror are placed symmetrically in opposite directions; and a light blocking block is placed on the first dichroic mirror in the direction of the reflected light;

[0007] The laser cavity comprises a third lens, a first lens, a laser gain medium, a second lens and a fourth lens; wherein the third lens is highly transparent to the doubled frequency light output by the frequency doubling module, the first lens, the second lens and the laser gain medium form a resonant cavity, and the laser gain medium is located between the first lens and the second lens; the first lens is highly transparent to the doubled frequency light and highly reflective to the laser cavity starting wavelength λ3, the second lens partially reflects the laser cavity starting wavelength λ3, and the fourth lens is highly transparent to the laser cavity starting wavelength λ3;

[0008] When the frequency doubling module is moved into the optical path, the fundamental frequency laser outputs fundamental frequency light with a wavelength of fundamental frequency wavelength λ1 and transmits it to the frequency doubling module; the fundamental frequency light is focused by the first lens and enters the frequency doubling crystal. After passing through the frequency doubling crystal, the laser has both fundamental frequency light and frequency doubling light; the laser after passing through the frequency doubling crystal passes through the first dichroic mirror and the second dichroic mirror, the fundamental frequency light is reflected, and the frequency doubling light is transmitted. The laser after passing through the first dichroic mirror and the second dichroic mirror is consistent with the original laser optical path direction. The first dichroic mirror and the second dichroic mirror separate the residual fundamental frequency light after frequency doubling and the frequency doubling light. The first and second dichroic mirrors are used in pairs to ensure that the directivity of the frequency-doubled light after the frequency-doubled module is moved into the optical path is the same as that of the fundamental frequency light when the frequency-doubled module is not moved into the optical path; the light-blocking block located in the direction of the reflected light of the first dichroic mirror blocks the residual fundamental frequency light after the frequency-doubled light; the frequency-doubled light transmitted through the second dichroic mirror is modulated by the second lens on the divergence angle of the frequency-doubled light, so that the divergence angle of the frequency-doubled light is the same as that of the fundamental frequency light, and the frequency-doubled light with a wavelength of λ2 of the frequency-doubled light is output after passing through the second lens;

[0009] When the laser cavity moves into the optical path, the frequency-doubled light output by the second lens is transmitted to the third lens; the third lens focuses the frequency-doubled light onto the laser gain medium; the frequency-doubled light passes through the first lens and is focused onto the laser gain medium to store energy for the laser gain medium, and the resonant cavity composed of the first lens, the laser gain medium and the second lens is started to output a laser with a wavelength of the laser cavity starting wavelength λ3, which is emitted through the second lens; the fourth lens modulates the divergence angle of the laser with a wavelength of the laser cavity starting wavelength λ3 output by the second lens, so that the divergence angle of the laser with a wavelength of the laser cavity starting wavelength λ3 output by the second lens is the same as the divergence angle of the fundamental frequency light output by the fundamental frequency laser, and the laser with a wavelength of the laser cavity starting wavelength λ3 is output after passing through the fourth lens.

[0010] The transmittance of the first lens to the fundamental frequency light output by the fundamental frequency laser is greater than 90%, and the transmittance of the second lens to the doubled frequency light is greater than 90%; the transmittance of the first lens to the doubled frequency light is greater than 90%, and the reflectivity to the laser cavity starting wavelength is greater than 99%, and the reflectivity of the second lens to the laser cavity starting wavelength λ3 is greater than 70% and less than 98%; the transmittance of the third lens to the doubled frequency light is greater than 90%, and the transmittance of the fourth lens to the laser cavity starting wavelength λ3 is greater than 90%.

[0011] When the laser equipment leaves the factory, the power supply voltage corresponding to the different output energies of the fundamental frequency laser is recorded in the controller; the frequency doubling module is placed in the optical path, the laser cavity is placed outside the optical path, and the power supply voltage of the fundamental frequency laser corresponding to the different output energies of the frequency doubling module is recorded in the controller; the frequency doubling module is placed in the optical path, and the laser cavity is placed in the optical path at the same time, and the power supply voltage of the fundamental frequency laser corresponding to the different output energies of the laser cavity is recorded in the controller.

[0012] The first moving device and the second moving device respectively adopt a one-dimensional displacement platform.

[0013] 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.

[0014] By selecting a suitable focal length of the second lens, the divergence angle of the doubled frequency light is made the same as the divergence angle of the fundamental frequency light; by selecting a suitable focal length of the fourth lens, the divergence angle of the laser with a wavelength of the laser cavity starting wavelength λ3 is made the same as the divergence angle of the fundamental frequency light, and the laser output characteristics are the same.

[0015] Another object of the present invention is to provide a method for realizing a laser device with three-wavelength output.

[0016] The method for realizing the three-wavelength output laser device of the present invention comprises the following steps:

[0017] 1. Output wavelength is the laser with fundamental wavelength λ1:

[0018] 1) When the laser device requires a fundamental wavelength λ1, the controller moves the frequency doubling module and the laser cavity out of the optical path by controlling the first moving device and the second moving device respectively;

[0019] 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.

[0020] The energy required to make the laser device output the fundamental wavelength λ1, and the laser device outputs the laser with the fundamental wavelength λ1; 2. The laser output wavelength is the double frequency wavelength λ2:

[0021] 1) When the laser device needs a frequency-doubled light wavelength λ2, the controller places the frequency-doubled module into the optical path by controlling the first moving device, and moves the laser cavity out of the optical path by controlling the second moving device;

[0022] 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 device outputs the energy required for the frequency-doubled light wavelength λ2;

[0023] 3) The fundamental frequency laser outputs fundamental frequency light having a wavelength of fundamental frequency wavelength λ1, and the fundamental frequency light is transmitted to the frequency doubling module;

[0024] 4) The fundamental frequency light is focused by the first lens and then enters the frequency doubling crystal. After passing through the frequency doubling crystal, the laser has both fundamental frequency light and frequency doubling light.

[0025] 5) After passing through the frequency doubling crystal, the laser passes through the first dichroic mirror and the second dichroic mirror, the fundamental frequency light is reflected, and the frequency doubling light is transmitted. The laser after passing through the first dichroic mirror and the second dichroic mirror is consistent with the direction of the original laser light path. The first dichroic mirror and the second dichroic mirror separate the residual fundamental frequency light and the frequency doubling light after the frequency doubling, thereby obtaining pure frequency doubling light. The first and second dichroic mirrors are used in pairs to ensure that the frequency doubling light after the frequency doubling module is moved into the light path has the same directivity as the fundamental frequency light when the frequency doubling module is not moved into the light path;

[0026] 6) The light blocking block located in the direction of the light reflected by the first dichroic mirror blocks the residual fundamental frequency light after the frequency doubling; the frequency doubling light after passing through the second dichroic mirror is modulated by the second lens on the divergence angle of the frequency doubling light, so that the divergence angle of the frequency doubling light is the same as the divergence angle of the fundamental frequency light, and the frequency doubling light with a wavelength of the frequency doubling light wavelength λ2 is output after passing through the second lens, and the laser device outputs a laser with a wavelength of the frequency doubling light wavelength λ2;

[0027] 3. The output wavelength of the laser is the laser cavity starting wavelength λ3:

[0028] 1) When the laser device requires a laser cavity starting wavelength λ3, the controller places the frequency doubling module and the laser cavity into the optical path by controlling the first and second moving devices;

[0029] 2) The controller reads the power supply voltage data from the previously stored data, and controls the power supply voltage of the fundamental frequency laser so that the laser device outputs the energy required for the laser cavity starting wavelength λ3;

[0030] 3) The fundamental frequency laser outputs fundamental frequency light with a fundamental frequency wavelength λ1, and the fundamental frequency light is transmitted to the frequency doubling module. The second lens of the frequency doubling module outputs the frequency doubling light with a wavelength of the frequency doubling light wavelength λ2 to the laser cavity;

[0031] 4) The frequency-doubled light output by the second lens is transmitted to the third lens, and the third lens focuses the frequency-doubled light onto the laser gain medium;

[0032] 5) The frequency-doubled light passes through the first lens and is focused onto the laser gain medium to store energy in the laser gain medium. After the resonant cavity composed of the first lens, the laser gain medium and the second lens is started, the laser with a wavelength of λ3 of the laser cavity starting wavelength is output and is emitted through the second lens;

[0033] 6) The fourth lens modulates the divergence angle of the laser with a wavelength of the laser cavity oscillation wavelength λ3 output by the second lens, so that the divergence angle of the laser with a wavelength of the laser cavity oscillation wavelength λ3 output by the second lens is the same as the divergence angle of the fundamental frequency light output by the fundamental frequency laser, and the laser with a wavelength of the laser cavity oscillation wavelength λ3 is output after passing through the fourth lens, and the laser device outputs a laser with a wavelength of the laser cavity oscillation wavelength λ3.

[0034] Advantages of the present invention:

[0035] The present invention adopts a fundamental frequency laser to output fundamental frequency light with a wavelength being the fundamental frequency wavelength, adopts a frequency doubling module to frequency-double the fundamental frequency light into frequency-doubled light, and uses a first and a second dichroic mirror in a pair to ensure that the frequency-doubled light after the frequency doubling module is moved into the optical path has the same directivity as the fundamental frequency light when the frequency doubling module is not moved into the optical path; the wavelength of the frequency-doubled light is converted into the laser cavity starting wavelength through a laser cavity, and the divergence angle of the frequency-doubled light is modulated by a second lens, and the divergence angle of the laser of the laser cavity starting wavelength is modulated by a fourth lens, so that the directivity and divergence angle 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 three lasers of different wavelengths respectively according to needs, without the need to prepare three lasers; the present invention not only reduces costs, but also brings great convenience to users in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A structural block diagram of an application of an embodiment of a laser device with three wavelength outputs according to the present invention;

[0037] Figure 2 The overall structural block diagram of an embodiment of a three-wavelength output laser device of the present invention;

[0038] Figure 3 A structural block diagram of a frequency doubling module of an embodiment of a three-wavelength output laser device of the present invention;

[0039] Figure 4 A structural block diagram of a laser cavity of an embodiment of a laser device with three-wavelength outputs according to the present invention;

[0040] Figure 5 It is an overall schematic diagram of an embodiment of a triple-wavelength output laser device of the present invention. DETAILED DESCRIPTION

[0041] The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings.

[0042] like Figure 1As shown, the laser output by the three-wavelength output laser device acts on the application terminal after passing through the light guide arm, and the three wavelengths share the light guide arm. The directivity and divergence angle of the lasers of different wavelengths output by the three-wavelength output laser device 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.

[0043] like Figure 2 and Figure 5 As shown, the three-wavelength output laser device of this embodiment includes: a fundamental frequency laser, a frequency doubling module, a laser cavity, a first and a second moving device, and a controller; wherein the fundamental frequency wavelength of the fundamental frequency light output by the fundamental frequency laser is λ1, the wavelength of the frequency doubling light output by the frequency doubling module is λ2, λ1=2×λ2, and the laser cavity starting wavelength output by the laser cavity is λ3, λ3>λ2; the frequency doubling module and the laser cavity are respectively placed on the first moving device and the second moving device; the controller is respectively connected to the fundamental frequency laser, the first moving device and the second moving device, the controller controls the output laser energy of the fundamental frequency laser, and the controller controls the first moving device and the second moving device respectively, so that the frequency doubling module and the laser cavity are respectively moved into or out of the optical path as needed;

[0044] like Figure 3 As shown, the frequency doubling module includes a first lens, a frequency doubling crystal, a first dichroic mirror, a second dichroic mirror, a second lens and a light blocking block; wherein the first lens has high transmittance to the fundamental frequency light output by the fundamental frequency laser, and the second lens has high transmittance to the doubled frequency light; the first and second dichroic mirrors reflect the fundamental frequency light and transmit the doubled frequency light; the first dichroic mirror and the second dichroic mirror are placed symmetrically in opposite directions; and the light blocking block is placed in the direction of the light reflected by the first dichroic mirror;

[0045] like Figure 4 As shown, the laser cavity includes a third lens, a first lens, a laser gain medium, a second lens and a fourth lens; wherein the third lens is highly transparent to the doubled frequency light output by the frequency doubling module, the first lens, the second lens and the laser gain medium form a resonant cavity, and the laser gain medium is located between the first lens and the second lens; the first lens is highly transparent to the doubled frequency light and highly reflective to the laser cavity starting wavelength λ3, the second lens partially reflects the laser cavity starting wavelength λ3, and the fourth lens is highly transparent to the laser cavity starting wavelength λ3.

[0046] The fundamental frequency laser is a Q-switched laser with a central wavelength of 1064nm, which outputs 0.2-20ns laser pulses. After the fundamental frequency laser pulses are output, the laser wavelength is converted to 532nm after passing through the frequency doubling module. The 532nm laser is used as the pump source of the laser cavity, and the laser cavity can further generate 755nm laser. The laser gain medium uses alexandrite crystal. The first and second moving devices respectively use one-dimensional displacement platforms.

[0047] When the laser equipment leaves the factory, the power supply voltage corresponding to the different output energies of the fundamental frequency laser is recorded in the controller; the frequency doubling module is placed in the optical path, the laser cavity is placed outside the optical path, and the power supply voltage of the fundamental frequency laser corresponding to the different output energies of the frequency doubling module is recorded in the controller; the frequency doubling module is placed in the optical path, and the laser cavity is placed in the optical path at the same time, and the power supply voltage of the fundamental frequency laser corresponding to the different output energies of the laser cavity is recorded in the controller.

[0048] 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.

[0049] The method for implementing the three-wavelength output laser device of this embodiment includes the following steps:

[0050] 1. Output wavelength is the laser with fundamental wavelength λ1:

[0051] 1) When the laser device requires a fundamental wavelength λ1, the controller moves the frequency doubling module and the laser cavity out of the optical path by controlling the first and second moving devices respectively;

[0052] 2) The controller reads the power supply voltage data from the previously stored data, and the controller controls the power supply voltage of the fundamental frequency laser, so that the laser device outputs the energy required for the fundamental frequency wavelength λ1, the fundamental frequency laser outputs the fundamental frequency light with the wavelength of the fundamental frequency wavelength λ1, and the laser device outputs the laser with the wavelength of the fundamental frequency wavelength λ1;

[0053] 2. Laser with output wavelength equal to doubled wavelength λ2:

[0054] 1) When the laser device needs a frequency-doubled light wavelength λ2, the controller places the frequency-doubled module into the optical path by controlling the first moving device, and moves the laser cavity out of the optical path by controlling the second moving device;

[0055] 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 device outputs the energy required for the frequency-doubled light wavelength λ2;

[0056] 3) The fundamental frequency laser outputs fundamental frequency light having a wavelength of fundamental frequency wavelength λ1, and the fundamental frequency light is transmitted to the frequency doubling module;

[0057] 4) The fundamental frequency light is focused by the first lens and then enters the frequency doubling crystal. After passing through the frequency doubling crystal, the laser has both fundamental frequency light and frequency doubling light.

[0058] 5) After passing through the frequency doubling crystal, the laser passes through the first dichroic mirror and the second dichroic mirror, the fundamental frequency light is reflected, and the frequency doubling light is transmitted. The laser after passing through the first dichroic mirror and the second dichroic mirror is consistent with the direction of the original laser light path. The first dichroic mirror and the second dichroic mirror separate the residual fundamental frequency light and the frequency doubling light after the frequency doubling, thereby obtaining a relatively pure frequency doubling light. The first and second dichroic mirrors are used in pairs to ensure that the frequency doubling light after the frequency doubling module is moved into the light path has the same directivity as the fundamental frequency light when the frequency doubling module is not moved into the light path;

[0059] 6) The light blocking block located in the direction of the light reflected by the first dichroic mirror blocks the residual fundamental frequency light after the frequency doubling; the frequency doubling light after passing through the second dichroic mirror is modulated by the second lens on the divergence angle of the frequency doubling light, so that the divergence angle of the frequency doubling light is the same as the divergence angle of the fundamental frequency light, and the frequency doubling light with a wavelength of the frequency doubling light wavelength λ2 is output after passing through the second lens, and the laser device outputs a laser with a wavelength of the frequency doubling light wavelength λ2;

[0060] 3. The output wavelength of the laser is the laser cavity starting wavelength λ3:

[0061] 1) When the laser device requires a laser cavity starting wavelength λ3, the controller places the frequency doubling module and the laser cavity into the optical path by controlling the first and second moving devices;

[0062] 2) The controller reads the power supply voltage data from the previously stored data, and controls the power supply voltage of the fundamental frequency laser so that the laser device outputs the energy required for the laser cavity starting wavelength λ3;

[0063] 3) The fundamental frequency laser outputs fundamental frequency light of fundamental frequency wavelength λ1 and transmits it to the frequency doubling module, and the second lens of the frequency doubling module outputs frequency doubling light of wavelength λ2 to the laser cavity;

[0064] 4) The frequency-doubled light output by the second lens is transmitted to the third lens, and the third lens focuses the frequency-doubled light onto the laser gain medium; 5) The frequency-doubled light passes through the first lens and is focused onto the laser gain medium to store energy for the laser gain medium. The resonant cavity composed of the first lens, the laser gain medium and the second lens is vibrated and then outputs a laser with a wavelength of the laser cavity starting wavelength λ3.

[0065] The light is emitted through the second lens;

[0066] 6) The fourth lens modulates the divergence angle of the laser with a wavelength of the laser cavity oscillation wavelength λ3 output by the second lens, so that the divergence angle of the laser with a wavelength of the laser cavity oscillation wavelength λ3 output by the second lens is the same as the divergence angle of the fundamental frequency light output by the fundamental frequency laser, and the laser with a wavelength of the laser cavity oscillation wavelength λ3 is output after passing through the fourth lens, and the laser device outputs a laser with a wavelength of the laser cavity oscillation wavelength λ3.

[0067] 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 laser device with three-wavelength output, It is characterized in that The three-wavelength output laser device comprises: a fundamental frequency laser, a frequency doubling module, a laser cavity, a first and a second moving device, and a controller; wherein the fundamental frequency wavelength of the fundamental frequency light output by the fundamental frequency laser is λ1, the wavelength of the frequency doubling light output by the frequency doubling module is λ2, λ1=2×λ2, and the laser cavity starting wavelength output by the laser cavity is λ3, λ3>λ2; the frequency doubling module and the laser cavity are respectively placed on the first moving device and the second moving device; the controller is respectively connected to the fundamental frequency laser, the first moving device and the second moving device, the controller controls the output laser energy of the fundamental frequency laser, and the controller controls the first moving device and the second moving device respectively, so that the frequency doubling module and the laser cavity are respectively moved into or out of the optical path as needed; The frequency doubling module includes a first lens, a frequency doubling crystal, a first dichroic mirror, a second dichroic mirror, a second lens and a light blocking block; wherein the first lens has high transmittance to the fundamental frequency light output by the fundamental frequency laser, and the second lens has high transmittance to the doubled frequency light; the first and second dichroic mirrors reflect the fundamental frequency light and transmit the doubled frequency light; the first dichroic mirror and the second dichroic mirror are placed symmetrically in opposite directions; and a light blocking block is placed on the first dichroic mirror in the direction of the reflected light; The laser cavity comprises a third lens, a first lens, a laser gain medium, a second lens and a fourth lens; wherein the third lens is highly transparent to the doubled frequency light output by the frequency doubling module, the first lens, the second lens and the laser gain medium form a resonant cavity, and the laser gain medium is located between the first lens and the second lens; the first lens is highly transparent to the doubled frequency light and highly reflective to the laser cavity starting wavelength λ3, the second lens partially reflects the laser cavity starting wavelength λ3, and the fourth lens is highly transparent to the laser cavity starting wavelength λ3; When the frequency doubling module is moved into the optical path, the fundamental frequency laser outputs fundamental frequency light with a wavelength of fundamental frequency wavelength λ1 and transmits it to the frequency doubling module; the fundamental frequency light is focused by the first lens and enters the frequency doubling crystal. After passing through the frequency doubling crystal, the laser has both fundamental frequency light and frequency doubling light; the laser after passing through the frequency doubling crystal passes through the first dichroic mirror and the second dichroic mirror, the fundamental frequency light is reflected, and the frequency doubling light is transmitted. The laser after passing through the first dichroic mirror and the second dichroic mirror is consistent with the original laser optical path direction. The first dichroic mirror and the second dichroic mirror separate the residual fundamental frequency light after frequency doubling and the frequency doubling light. The first and second dichroic mirrors are used in pairs to ensure that the directivity of the frequency-doubled light after the frequency-doubled module is moved into the optical path is the same as that of the fundamental frequency light when the frequency-doubled module is not moved into the optical path; the light-blocking block located in the direction of the reflected light of the first dichroic mirror blocks the residual fundamental frequency light after the frequency-doubled light; the frequency-doubled light transmitted through the second dichroic mirror is modulated by the second lens on the divergence angle of the frequency-doubled light, so that the divergence angle of the frequency-doubled light is the same as that of the fundamental frequency light, and the frequency-doubled light with a wavelength of λ2 of the frequency-doubled light is output after passing through the second lens; When the laser cavity moves into the optical path, the frequency-doubled light output by the second lens is transmitted to the third lens; the third lens focuses the frequency-doubled light onto the laser gain medium; the frequency-doubled light passes through the first lens and is focused onto the laser gain medium to store energy for the laser gain medium, and the resonant cavity composed of the first lens, the laser gain medium and the second lens is started to output a laser with a wavelength of the laser cavity starting wavelength λ3, which is emitted through the second lens; the fourth lens modulates the divergence angle of the laser with a wavelength of the laser cavity starting wavelength λ3 output by the second lens, so that the divergence angle of the laser with a wavelength of the laser cavity starting wavelength λ3 output by the second lens is the same as the divergence angle of the fundamental frequency light output by the fundamental frequency laser, and the laser with a wavelength of the laser cavity starting wavelength λ3 is output after passing through the fourth lens.

2. The three-wavelength output laser device according to claim 1, It is characterized in that The fundamental frequency laser outputs 1-20ns laser pulses.

3. The three-wavelength output laser device according to claim 1, It is characterized in that The transmittance of the first lens to the fundamental frequency light output by the fundamental frequency laser is greater than 90%.

4. The three-wavelength output laser device according to claim 1, It is characterized in that The transmittance of the second lens to the frequency-doubled light is greater than 90%.

5. The three-wavelength output laser device according to claim 4, It is characterized in that The transmittance of the fourth lens to the laser cavity oscillation wavelength λ3 is greater than 90%.

6. The three-wavelength output laser device according to claim 1, It is characterized in that The transmittance of the first lens to the doubled frequency light is greater than 90%, and the reflectivity to the laser cavity starting wavelength is greater than 99%. The reflectivity of the second lens to the laser cavity starting wavelength λ3 is greater than 70% and less than 98%.

7. The three-wavelength output laser device according to claim 1, It is characterized in that The first moving device and the second moving device respectively adopt a one-dimensional displacement platform.

8. The three-wavelength output laser device according to claim 1, It is characterized in that 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.

9. A method for implementing the three-wavelength output laser device as claimed in claim 1, It is characterized in that The implementation method comprises the following steps:

1. Output wavelength is the laser with fundamental wavelength λ1: 1) When the laser device requires a fundamental wavelength λ1, the controller moves the frequency doubling module and the laser cavity out of the optical path by controlling the first moving device and the second moving device respectively; 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 device output the fundamental wavelength λ1, and the laser device outputs the laser with the fundamental wavelength λ1; 2. The laser output wavelength is the doubled wavelength λ2: 1) When the laser device needs a frequency-doubled light wavelength λ2, the controller places the frequency-doubled module into the optical path by controlling the first moving device, and moves the laser cavity out of the optical path by controlling the second 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 device output the frequency-doubled light wavelength λ2; 3) The fundamental frequency laser outputs fundamental frequency light having a wavelength of fundamental frequency wavelength λ1, and the fundamental frequency light is transmitted to the frequency doubling module; 4) The fundamental frequency light is focused by the first lens and then enters the frequency doubling crystal. After passing through the frequency doubling crystal, the laser has both fundamental frequency light and frequency doubling light. 5) After passing through the frequency doubling crystal, the laser passes through the first dichroic mirror and the second dichroic mirror, the fundamental frequency light is reflected, and the frequency doubling light is transmitted. The laser after passing through the first dichroic mirror and the second dichroic mirror is consistent with the direction of the original laser light path. The first dichroic mirror and the second dichroic mirror separate the residual fundamental frequency light and the frequency doubling light after the frequency doubling, thereby obtaining pure frequency doubling light. The first and second dichroic mirrors are used in pairs to ensure that the frequency doubling light after the frequency doubling module is moved into the light path has the same directivity as the fundamental frequency light when the frequency doubling module is not moved into the light path; 6) The light blocking block located in the direction of the light reflected by the first dichroic mirror blocks the residual fundamental frequency light after the frequency doubling; the frequency doubling light after passing through the second dichroic mirror is modulated by the second lens on the divergence angle of the frequency doubling light, so that the divergence angle of the frequency doubling light is the same as the divergence angle of the fundamental frequency light, and the frequency doubling light with a wavelength of the frequency doubling light wavelength λ2 is output after passing through the second lens, and the laser device outputs a laser with a wavelength of the frequency doubling light wavelength λ2; 3. The output wavelength of the laser is the laser cavity starting wavelength λ3: 1) When the laser device requires a laser cavity starting wavelength λ3, the controller places the frequency doubling module and the laser cavity 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 device output the laser cavity starting wavelength λ3; 3) The fundamental frequency laser outputs fundamental frequency light with a fundamental frequency wavelength λ1, and the fundamental frequency light is transmitted to the frequency doubling module. The second lens of the frequency doubling module outputs the frequency doubling light with a wavelength of the frequency doubling light wavelength λ2 to the laser cavity; 4) The frequency-doubled light output by the second lens is transmitted to the third lens, and the third lens focuses the frequency-doubled light onto the laser gain medium; 5) The frequency-doubled light passes through the first lens and is focused onto the laser gain medium to store energy in the laser gain medium. After the resonant cavity composed of the first lens, the laser gain medium and the second lens is started, the laser with a wavelength of λ3 of the laser cavity starting wavelength is output and is emitted through the second lens; 6) The fourth lens modulates the divergence angle of the laser with a wavelength of the laser cavity oscillation wavelength λ3 output by the second lens, so that the divergence angle of the laser with a wavelength of the laser cavity oscillation wavelength λ3 output by the second lens is the same as the divergence angle of the fundamental frequency light output by the fundamental frequency laser, and the laser with a wavelength of the laser cavity oscillation wavelength λ3 is output after passing through the fourth lens, and the laser device outputs a laser with a wavelength of the laser cavity oscillation wavelength λ3.

10. The implementation method according to claim 9, It is characterized in that When the laser equipment leaves the factory, the power supply voltage corresponding to different output energies of the fundamental frequency laser is recorded in the controller; the frequency doubling module is placed in the optical path, the laser cavity is placed outside the optical path, and the power supply voltage of the fundamental frequency laser corresponding to different output energies of the frequency doubling module is recorded in the controller; The frequency doubling module is placed in the optical path, and the laser cavity is placed in the optical path at the same time, and the power supply voltage of the fundamental frequency laser corresponding to the different energies output by the laser cavity is recorded in the controller.

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