High-power narrow-spectrum wide-pulse laser

Abstract

The invention discloses a high-power narrow-spectrum wide-pulse laser. The high-power narrow-spectrum wide-pulse laser comprises a pump light providing system and a resonant cavity, a gain crystal and a nonlinear optical crystal are arranged in the resonant cavity, first pump light and second pump light output by the pump light providing system are input into the resonant cavity, the first pump light and the second pump light have the same repetition frequency, and time delay exists between pulses of the first pump light and pulses of the second pump light. The gain crystal and the nonlinear optical crystal are arranged in the resonant cavity, and the signal light generated in the optical parameter process is used as the seed light in the gain process, so that the pulse establishment time and the pulse width of the laser are reduced, and the time domain jitter of the output laser pulse is reduced; meanwhile, laser generated in the gain process serves as signal light in the optical parameter process, the conversion efficiency of the optical parameter process is improved by increasing coupling between the pump light and the signal light used for optical parameters, and finally pulse light which is stable in pulse sequence, high in power and narrow in spectrum width is output.

Description

Technical Field

[0001] The present application relates to the field of laser technology, and more specifically, to a high-power narrow-spectrum pulse laser. Background Art

[0002] Stable high-power narrow-spectrum pulse lasers have the advantages of high coherence, high beam quality, and stable pulse sequences. High-power narrow-spectrum lasers have good absorption and penetration capabilities for a variety of substances such as biological tissues, atmosphere, and chemical elements. Therefore, they are widely used in precision measurement, lidar, laser communications, laser spectroscopy, biological detection, laser guidance, and industrial manufacturing.

[0003] Generally, one of the ways to achieve high-power narrow-spectrum lasers is the stimulated emission process of the gain medium. For high-power pulsed lasers that use the gain medium, the inherent quantum loss of the stimulated emission process will lead to significant thermal effects in the gain crystal, making it impossible for the resonant cavity based on a single crystal to simultaneously achieve high conversion efficiency and high beam quality laser output. For pulsed lasers based on gain switching technology, at low pump rates, due to the influence of the proportion of spontaneous radiation, the jitter of the pulse establishment time of the output laser will be very obvious, and the pulse width will be wider than the pulse width of the pump light, thus affecting the pulse sequence stability of the output laser.

[0004] Another approach to achieve high-power narrow-spectrum lasers is the optical parametric process based on nonlinear optical crystals. 4 Laser, Nd:YAG laser) and its frequency-doubled and tripled light pumping have become important devices for obtaining light sources in other bands due to their high conversion efficiency and negligible thermal effects. However, when pumped at high peak power, the spectral width of the parametric light generated by the optical parametric process can reach the nanometer level. It is usually necessary to insert a mode-selective element into the resonant cavity to narrow the signal spectrum width, but due to the lack of a mode competition mechanism in the optical parametric process, its output power and conversion efficiency will be limited to a low level. In addition, although the spectral width can be narrowed by injecting seeds and seed injection locking technology, a high-quality and stable single-frequency laser must be obtained as a seed source, which undoubtedly increases the cost and complexity of the light source system.

[0005] It can be seen from the above that it is difficult to obtain a high-power narrow-spectrum pulse laser output with a stable pulse sequence using a single gain process or optical parameter process. Summary of the invention

[0006] The present application provides a high-power narrow-spectrum pulse laser, in which a gain crystal is arranged in a resonant cavity to realize a gain process, and a nonlinear optical crystal is arranged to realize an optical parametric process. The signal light generated by the optical parametric process serves as the seed light of the gain process, and by reducing the proportion of spontaneous radiation in the gain process, the pulse establishment time and pulse width of the laser are shortened, thereby reducing the time domain jitter of the output laser pulse; at the same time, the laser generated by the gain process serves as the signal light of the optical parametric process, and by increasing the coupling between the pump light and the signal light used for the optical parameter, the conversion efficiency of the optical parametric process is improved, and finally a pulse light with a stable pulse sequence, high power and narrow spectrum width is output.

[0007] The present application provides a high-power narrow-spectrum pulse laser, including a pump light providing system and a resonant cavity;

[0008] A gain crystal and a nonlinear optical crystal are arranged in the resonant cavity. The first pump light and the second pump light output by the pump light system are input into the resonant cavity. The first pump light and the second pump light have the same repetition frequency, and there is a delay between the pulses of the first pump light and the second pump light.

[0009] Preferably, the narrow spectrum width pulse laser further comprises a temperature control system for adjusting the temperature of the nonlinear optical crystal.

[0010] Preferably, a spectrum narrowing component is also provided in the resonant cavity.

[0011] Preferably, the pump light providing system includes a pump light generating system and an optical coupling system.

[0012] Preferably, the pump light generating system comprises a first pump source, a second pump source and a first digital delay generator, the first pump source and the second pump source are respectively connected to the first digital delay generator, and the first pump source and the second pump source output the first pump light and the second pump light.

[0013] Preferably, the pump light generating system comprises a third pump source, a second digital delay generator and a beam splitter, the second digital delay generator controls the third pump source to emit a double-pulse laser, and the double-pulse laser forms a first pump light and a second pump light after passing through the beam splitter.

[0014] Preferably, the beam splitting device further comprises a polarization beam splitting prism and a first light guide mirror, and the polarization beam splitting prism is arranged on the output light path of the Pockels cell;

[0015] The first pump light is transmitted through the polarization beam splitter prism and then input into the optical coupling system; the second pump light is reflected through the polarization beam splitter prism and then input into the optical coupling system through the first light guide mirror.

[0016] Preferably, the resonant cavity comprises a first input mirror and a second input mirror, the first pump light enters the first input mirror after passing through a first optical coupling system, and the second pump light enters the second input mirror after passing through a second optical coupling system.

[0017] Preferably, the resonant cavity is a four-mirror ring cavity or an L-shaped folded cavity.

[0018] Preferably, the resonant cavity is a three-mirror ring cavity, comprising a third input mirror;

[0019] The first pump light passes through the first optical coupling system and then enters the third input mirror through the second light guide mirror; the second pump light passes through the second optical coupling system and then enters the third input mirror through the third light guide mirror.

[0020] Preferably, the resonant cavity is a linear cavity, comprising a fourth input mirror;

[0021] The first pump light passes through the first optical coupling system, is reflected by the fourth light guide mirror and the beam splitter in sequence, and then enters the fourth input mirror; the second pump light passes through the second optical coupling system, is transmitted by the beam splitter, and then enters the fourth input mirror.

[0022] Preferably, the annular cavity comprises a first output mirror and a second output mirror, the first output mirror is used to output pulsed light, the second output mirror is used to output the remaining first pump light and idler light, and a plane reflector is disposed outside the first output mirror.

[0023] Preferably, the resonant cavity is a linear cavity, comprising a fifth input mirror;

[0024] The first pump light and the second pump light enter the fifth input mirror after passing through the first optical coupling system.

[0025] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0027] Figure 1 A structural diagram of a first embodiment of a high-power narrow-spectrum pulse laser provided by the present application;

[0028] Figure 2 A structural diagram of a second embodiment of a high-power narrow-spectrum pulse laser provided by the present application;

[0029] Figure 3 A structural diagram of a third embodiment of a high-power narrow-spectrum pulse laser provided by the present application;

[0030] Figure 4A structural diagram of a fourth embodiment of a high-power narrow-spectrum pulse laser provided by the present application;

[0031] Figure 5 A structural diagram of a fifth embodiment of a high-power narrow-spectrum pulse laser provided by the present application;

[0032] Figure 6 This is a structural diagram of a sixth embodiment of the high-power narrow-spectrum pulse laser provided by the present application. DETAILED DESCRIPTION

[0033] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0034] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0035] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0036] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0037] The present application provides a high-power narrow-spectrum pulse laser, in which a gain crystal is arranged in a resonant cavity to realize a gain process, and a nonlinear optical crystal is arranged to realize an optical parametric process. The signal light generated by the optical parametric process serves as the seed light of the gain process, so that the pulse establishment time and pulse width of the laser are shortened, thereby reducing the time domain jitter of the output laser pulse; at the same time, the laser generated by the gain process serves as the signal light of the optical parametric process, and the conversion efficiency of the optical parametric process is improved by increasing the coupling between the pump light and the signal light used for the optical parameter, and finally outputs a pulse light with a stable pulse sequence, high power and narrow spectrum width.

[0038] The high-power narrow-spectrum pulse laser provided in the present application comprises a pump light providing system and a resonant cavity 3. The narrow-spectrum pulse laser also comprises a temperature control system 4 for adjusting the temperature of the nonlinear optical crystal.

[0039] A gain crystal 37 and a nonlinear optical crystal 36 are arranged in the resonant cavity 3. The first pump light and the second pump light provided by the pump light system are input into the resonant cavity 3. The first pump light and the second pump light have the same repetition frequency, and there is a delay between the pulses of the first pump light and the second pump light.

[0040] Specifically, Figure 1-6 As shown, the pump light providing system includes a pump light generating system 1 and an optical coupling system 2 .

[0041] As an example, Figure 1-4 As shown, the pump light generating system 1 includes a first pump source 11, a second pump source 12 and a first digital delay generator 13. The first pump source 11 and the second pump source 12 are respectively connected to the first digital delay generator 13, and the first pump source 11 and the second pump source 12 output the first pump light and the second pump light respectively. The first digital delay generator 13 controls the first pump source 11 and the second pump source 12 to be triggered synchronously, so that there is a fixed delay between the pulses of the first pump light and the second pump light emitted by the two. At the same time, the relative delay between the pulses of the first pump light and the second pump light can be flexibly adjusted by changing the parameters of the first digital delay generator 13.

[0042] Based on the above pump light generating system, as an embodiment, Figure 1-4 As shown, the optical coupling system includes a first optical coupling system and a second optical coupling system. The first pump light output by the pump light generating system 1 enters the resonant cavity 3 after passing through the first optical coupling system, and the second pump light enters the resonant cavity 3 after passing through the second optical coupling system.

[0043] Specifically, the first optical coupling system includes a first beam shaping system 21 and a first half-wave plate 22. The first beam shaping system 21 includes at least two lenses. Figure 1-4 The first lens 211 and the second lens 212 are shown, which are used to adjust the spot size of the first pump light at the nonlinear optical crystal 36 in the resonant cavity 3, and maximize the conversion efficiency of the nonlinear process by optimizing the mode matching between the first pump light and the cavity mode at the nonlinear optical crystal 36. The first half-wave plate 22 is used to calibrate the polarization state of the first pump light entering the nonlinear optical crystal 36.

[0044] The second optical coupling system includes a second beam shaping system 23 and a second half-wave plate 24. The second beam shaping system 23 includes at least two lenses. Figure 1-4 The third lens 231 and the fourth lens 232 are shown, which are used to adjust the spot size of the second pump light at the gain crystal 37 in the resonant cavity 3, and maximize the conversion efficiency of the gain process by optimizing the mode matching between the second pump light and the cavity mode at the gain crystal 37. The second half-wave plate 24 is used to calibrate the polarization state of the second pump light entering the gain crystal 37.

[0045] Based on the above-mentioned pump light generation system and optical coupling system, as an embodiment, the resonant cavity 3 is a ring cavity. As an embodiment, no isolator is set in the ring cavity, and the ring cavity includes a first output mirror and a second output mirror. The first output mirror is used to output pulse laser (as the output light of a high-power narrow-spectrum pulse laser), and the second output mirror is used to output the first pump light and idler light remaining in the optical parameter process. A plane reflector is provided on the outer side of the first output mirror. The plane reflector is coated with a dielectric film with high reflection to the laser wavelength, which is used to return the oscillating laser output from the reverse optical path to the resonant cavity through the first output mirror, and the stable unidirectional operation of the laser is ensured by self-injection.

[0046] Example 1

[0047] Based on the above-mentioned pump light generation system and optical coupling system, Figure 1 As shown, the resonant cavity 3 is a four-mirror ring cavity, which includes a first input mirror 31, a second input mirror 32, a first output mirror 33 and a second output mirror 34. The first input mirror 31 is coated with a dielectric film with high transmittance to the first pump light wavelength and high reflection to the oscillating laser wavelength in the resonant cavity. The second input mirror 32 is coated with a dielectric film with high transmittance to the second pump light wavelength and high reflection to the laser wavelength. The first output mirror 33 is coated with a dielectric film with high transmittance to the second pump light wavelength and a certain transmittance to the laser wavelength; the second output mirror 34 is coated with a dielectric film with high transmittance to the wavelengths of the first pump light and idler light and high reflection to the laser wavelength. The nonlinear optical crystal 36 is placed between the first input mirror 31 and the second output mirror 34, and the gain crystal 37 is placed between the second input mirror 32 and the first output mirror 33.

[0048] Figure 1 In the embodiment, no isolator is arranged in the annular cavity. Therefore, the laser oscillating in the resonant cavity has a forward optical path (first input mirror 31→second output mirror 34→first output mirror 33→second input mirror 32→first input mirror 31) and a reverse optical path (first input mirror 31→second input mirror 32→first output mirror 33→second output mirror 34→first input mirror 31). In order to suppress the reverse optical path in the resonant cavity and make it run unidirectionally along the forward optical path, a plane reflecting mirror 35 is arranged on the outer side of the first output mirror 33 to reflect the oscillating laser outputted through the first output mirror 33 on the reverse optical path, so that it re-enters the resonant cavity and drives the oscillating laser in the resonant cavity to be transmitted along the forward optical path.

[0049] Preferably, a spectrum narrowing component 38 is also provided in the resonant cavity 3. As an embodiment, Figure 1As shown, the spectrum narrowing component 38 includes a first etalon 381, a second etalon 382 and a birefringent filter 383. The birefringent filter 383 is placed between the first output mirror 33 and the second output mirror 34 as a coarse mode selection element. The first etalon 381 and the second etalon 382 are fine mode selection elements, which are placed between the first input mirror 31 and the second input mirror 32. First, by changing the angle of the birefringent filter 383, a wide range of tuning and selection of the laser wavelength generated based on the gain process in the resonant cavity is performed. Subsequently, by fine tuning and selection of the laser wavelength generated based on the gain process in the resonant cavity by the first etalon 381 and the second etalon 382, ​​the laser spectrum width is narrowed, thereby achieving a pulsed laser output with a narrow spectrum width.

[0050] At the same time, the wavelength of the generated signal light is made consistent with the wavelength of the oscillating laser by scanning the temperature of the nonlinear optical crystal 36. And by changing the delay between the pulses of the first pump light and the second pump light, the oscillating laser pulse generated based on the gain process in the resonant cavity 3 is strictly aligned with the signal light pulse, thereby increasing the power density of the oscillating light in the cavity and reducing the pulse establishment time and pulse width.

[0051] The principle of the preferred embodiment with the spectrum narrowing component 38 is as follows:

[0052] First, the second pump light is injected into the resonant cavity 3, and the second pump light is incident on the gain crystal 37. The oscillating laser is generated through the stimulated radiation process of the gain crystal 37 and the amplification of the resonant cavity 3. Then the spectrum width narrowing component 38 tunes the output laser wavelength to the target wavelength. Then the first pump light is injected into the resonant cavity 3, and the first pump light is incident on the nonlinear optical crystal 36. The signal light and the idler light are generated through the optical parametric process. In order to prevent the optical parametric process from being reversed, the generated idler light and the remaining first pump light are promptly exported out of the resonant cavity 3 through the second output mirror 34. By changing the parameters of the temperature control system 4, the temperature of the nonlinear optical crystal 36 is scanned to the phase matching temperature corresponding to the target wavelength, so that the wavelength of the signal light generated by the nonlinear optical crystal 36 is consistent with the wavelength of the laser in the cavity (i.e., the target wavelength). Finally, by changing the setting parameters of the first digital delay generator 13, the laser pulse generated by the gain process is strictly aligned with the signal light pulse generated by the optical parametric process, thereby improving the power density of the oscillating laser in the cavity and reducing the pulse establishment time and pulse width.

[0053] At this time, the signal light of the optical parametric process serves as the seed light of the gain process, which reduces the proportion of spontaneous radiation in the laser generation process and accelerates the stimulated radiation process in the gain crystal, thereby shortening the pulse establishment time of the output laser and narrowing the pulse width, and reducing the time domain jitter of the laser pulse output by the laser. At the same time, the laser generated by the gain process serves as the signal light of the optical parametric process, and the conversion efficiency of the optical parametric process is improved by increasing the coupling between the first pump light and the signal light. Finally, the oscillating laser and the signal light transmitted through the first output mirror 33 on the forward optical path are used together as the output light of the high-power narrow-spectrum pulse laser.

[0054] Example 2

[0055] Based on the above-mentioned pump light generating system and optical coupling system, as another embodiment, Figure 2 As shown, the resonant cavity 3 is a three-mirror ring cavity, which includes a third input mirror 39, a first output mirror 310 and a second output mirror 320. The third input mirror 39 is coated with a dielectric film that is highly transparent to the first pump light wavelength and the second pump light wavelength and highly reflective to the laser wavelength. The second output mirror 320 is coated with a dielectric film that is highly transparent to the first pump light and idler light wavelengths and highly reflective to the laser wavelength. The first output mirror 310 is coated with a dielectric film that is highly transparent to the second pump light wavelength and has a certain transmittance to the laser wavelength. The nonlinear optical crystal 36 is placed between the third input mirror 39 and the second output mirror 320, and the gain crystal 37 is placed between the third input mirror 39 and the first output mirror 310. A plane reflector 35 is provided on the outer side of the first output mirror 310. The plane reflector 35 is coated with a dielectric film that is highly reflective to the laser wavelength, and the stable unidirectional operation of the laser is ensured by self-injection.

[0056] On the basis of the above, if Figure 2 As shown, preferably, the first etalon 381 , the second etalon 382 and the birefringent filter 383 of the spectrum narrowing component 38 are all located between the first output mirror 310 and the second output mirror 320 .

[0057] like Figure 2 As shown, after the first pump light passes through the first optical coupling system, it enters the third input mirror 39 through the second light guide mirror 5 (coated with a dielectric film with high reflectivity to the wavelength of the first pump light). After the second pump light passes through the second optical coupling system, it enters the third input mirror 39 through the third light guide mirror 6 (coated with a dielectric film with high reflectivity to the wavelength of the second pump light). Figure 2 The working principle of the resonant cavity is Figure 1 same.

[0058] Example 3

[0059] Based on the above-mentioned pump light generating system and optical coupling system, as another embodiment, Figure 3As shown, the resonant cavity 3 is an L-shaped folded cavity, including a first input mirror 330, a second input mirror 340 and an output mirror 350, and the second input mirror 340 is placed at a 45° angle; in the optical path, the first input mirror 330 and the output mirror 350 are respectively located on both sides of the second input mirror 340. The first input mirror 330 is coated with a dielectric film with high transmittance to the first pump light wavelength and high reflection to the laser wavelength. The second input mirror 340 is coated with a dielectric film with high transmittance to the first pump light, the second pump light and the idler light wavelength, and high reflection to the laser. The output mirror 350 is coated with a dielectric film with high transmittance to the second pump light and a certain transmittance of the laser. The nonlinear optical crystal 36 is placed between the first input mirror 330 and the second input mirror 340, and the gain crystal 37 is placed between the second input mirror 340 and the output mirror 350.

[0060] Preferably, if Figure 3 As shown, a spectrum narrowing component 38 is also provided in the resonant cavity 3 , and a first etalon 381 , a second etalon 382 and a birefringent filter 383 are all placed between the gain crystal 37 and the output mirror 350 .

[0061] The first pump light enters the first input mirror 330 after being reflected by the fifth light guide mirror 9, and the second pump light directly enters the second input mirror 340. The working principle in the resonant cavity 3 is as described above.

[0062] Example 4

[0063] Based on the above-mentioned pump light generating system and optical coupling system, as another embodiment, Figure 4 As shown, the resonant cavity 3 is a linear cavity, including a fourth input mirror 360 and an output mirror 370. The fourth input mirror 360 is coated with a dielectric film with high transmittance to the first pump light and the second pump light wavelengths and high reflectance to the laser wavelength. The output mirror 370 is coated with a dielectric film with high transmittance to the first pump light, the second pump light and the idler light and a certain transmittance to the laser wavelength. The nonlinear optical crystal 36, the gain crystal 37 and the spectrum narrowing component 38 are sequentially arranged between the fourth input mirror 360 and the output mirror 370. After passing through the first optical coupling system, the first pump light is reflected by the fourth light guide mirror 10 (coated with a dielectric film with high reflectance to the first pump light wavelength) and the first beam splitter 7 (coated with a dielectric film with high reflectance to the first pump light wavelength and high transmittance to the second pump light wavelength) in sequence, and then enters the fourth input mirror 360; after passing through the second optical coupling system, the second pump light is transmitted through the first beam splitter 7 and then enters the fourth input mirror 360. The first pump light and the second pump light are combined and enter the resonant cavity 3. The working principle in the resonant cavity 3 is shown in the above description.

[0064] like Figure 4As shown, a second beam splitter 8 is placed behind the output mirror 370, which is coated with a dielectric film with high transmittance to the first pump light, the second pump light and the idler light wavelengths and high reflectivity to the laser wavelength. It is used to separate the transmitted oscillating laser and signal light from the light transmitted by the resonant cavity 3 as the output light of the high-power narrow-spectrum pulse laser.

[0065] As another example, Figure 5-6 As shown, the pump light generating system 1 comprises a third pump source 17, a second digital delay generator 16 and a beam splitter 14. The second digital delay generator 16 controls the third pump source 17 to emit a double-pulse laser, which forms a first pump light and a second pump light after passing through the beam splitter.

[0066] Example 5

[0067] Based on the above pump light generating system, as an embodiment, Figure 5 As shown, the beam splitting device 14 includes a Pockels cell 141, and the second digital delay generator 16 is connected to the Pockels cell 141. The second digital delay generator 16 is used to trigger the third pump source 17 and control the delay between the two pulse lasers output by the third pump source 17, and is used to synchronously trigger the Pockels cell 141. The double-pulse laser output by the third pump source 17 passes through the Pockels cell 141, and the polarization of the first pulse in the double-pulse laser is calibrated to vertical polarization to form a first pump light; at the same time, the polarization of the second pulse is calibrated to horizontal polarization to form a second pump light.

[0068] like Figure 5 As shown, the optical coupling system includes a first optical coupling system, including a first beam shaping system 21 and a first half-wave plate 22. The first beam shaping system 21 includes at least two lenses, Figure 5 The first lens 211 and the second lens 212 are shown, which are used to adjust the spot size of the first pump light and the second pump light at the nonlinear optical crystal 36 and the gain crystal 37, and maximize the conversion efficiency of the nonlinear process and the gain process by optimizing the mode matching between the double-pulse pump light and the cavity mode at the nonlinear optical crystal 36 and the gain crystal 37 in the resonant cavity 3. The first half-wave plate 22 is used to calibrate the polarization state of the double-pulse pump light entering the resonant cavity 3.

[0069] The resonant cavity 3 is a linear cavity, including a fifth input mirror 380 and an output mirror 390. The first pump light and the second pump light enter the fifth input mirror 380 after passing through the first optical coupling system. The fifth input mirror 380 is coated with a dielectric film with high transmittance to the wavelengths of the first pump light and the second pump light and high reflectance to the laser wavelength. The output mirror 390 is coated with a dielectric film with high transmittance to the first pump light, the second pump light and the idler light and a certain transmittance to the laser wavelength. The nonlinear optical crystal 36, the gain crystal 37 and the spectrum narrowing component 38 are sequentially arranged between the fifth input mirror 380 and the output mirror 390. The second beam splitter 8 is placed behind the output mirror 390, which is coated with a dielectric film with high transmittance to the wavelengths of the first pump light, the second pump light and the idler light and high reflectance to the laser wavelength, and is used to separate the transmitted oscillating laser and signal light from the light transmitted by the resonant cavity 3 as the output light of the high-power narrow spectrum pulse laser.

[0070] Example 6

[0071] Based on the above pump light generating system, as another embodiment, Figure 6 As shown, on the basis of the above, the beam splitting device further includes a polarization beam splitting prism 142 and a first light guide mirror 143, and the polarization beam splitting prism 142 is arranged on the output light path of the Pockels cell 141. The function of the Pockels cell 141 is similar to Figure 5 The first light guide mirror 143 is arranged on the reflected light path of the Pockels cell 141 .

[0072] The optical coupling system includes a first optical coupling system and a second optical coupling system. The first pump light is transmitted through the polarization beam splitter prism 142 to form the first pump light, and enters the first optical coupling system; the second pump light is reflected through the polarization beam splitter prism 142 to form the second pump light, and is reflected through the first light guide mirror 143 to enter the second optical coupling system.

[0073] like Figure 6 As shown, the resonant cavity is a four-mirror ring cavity, and its structure and principle are similar to Figure 1 The resonant cavity is the same.

[0074] Understandably, in Figure 6 Based on the pump light generating system 1 shown, the resonant cavity can also be a linear cavity (please refer to Figure 4 )、L-shaped folding cavity (please refer to Figure 3 ) or other annular cavities (e.g. Figure 2 The three-mirror annular cavity shown in the figure) and other cavity types.

[0075] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A high-power narrow-spectrum pulse laser, characterized in that: It includes a pump light supply system and a resonant cavity; A gain crystal and a nonlinear optical crystal are arranged in the resonant cavity. The first pump light and the second pump light output by the pump light providing system are input into the resonant cavity. The first pump light and the second pump light have the same repetition frequency, and there is a delay between the pulses of the first pump light and the second pump light.

2. The high-power narrow-spectrum pulse laser according to claim 1, characterized in that: The narrow spectrum pulse laser further comprises a temperature control system for adjusting the temperature of the nonlinear optical crystal.

3. The high-power narrow-spectrum pulse laser according to claim 1 or 2, characterized in that: A spectrum narrowing component is also provided in the resonant cavity.

4. The high-power narrow-spectrum pulse laser according to claim 1, characterized in that: The pump light providing system includes a pump light generating system and an optical coupling system.

5. The high-power narrow-spectrum pulse laser according to claim 4, characterized in that: The pump light generating system includes a first pump source, a second pump source and a first digital delay generator. The first pump source and the second pump source are respectively connected to the first digital delay generator. The first pump source and the second pump source output the first pump light and the second pump light.

6. The high-power narrow-spectrum pulse laser according to claim 5, characterized in that: The resonant cavity comprises a first input mirror and a second input mirror. The first pump light enters the first input mirror after passing through a first optical coupling system, and the second pump light enters the second input mirror after passing through a second optical coupling system.

7. The high-power narrow-spectrum pulse laser according to claim 6, characterized in that: The resonant cavity is a four-mirror ring cavity or an L-shaped folded cavity.

8. The high-power narrow-spectrum pulse laser according to claim 5, characterized in that: The resonant cavity is a three-mirror ring cavity, including a third input mirror; The first pump light passes through the first optical coupling system and then enters the third input mirror through the second light guide mirror; the second pump light passes through the second optical coupling system and then enters the third input mirror through the third light guide mirror.

9. The high-power narrow-spectrum pulse laser according to claim 5, characterized in that: The resonant cavity is a linear cavity, comprising a fourth input mirror; The first pump light passes through the first optical coupling system, is reflected by the fourth light guide mirror and the beam splitter in sequence, and then enters the fourth input mirror; the second pump light passes through the second optical coupling system, is transmitted by the beam splitter, and then enters the fourth input mirror.

10. The high-power narrow-spectrum pulse laser according to claim 7 or 8, characterized in that: The ring cavity comprises a first output mirror and a second output mirror, wherein the first output mirror is used to output pulse light, and the second output mirror is used to output the remaining first pump light and idler light, and a plane reflector is arranged outside the first output mirror.

Images