CN112636156B - Satellite-borne high-energy dual-wavelength all-solid-state pulse laser - Google Patents
Satellite-borne high-energy dual-wavelength all-solid-state pulse laser Download PDFInfo
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- CN112636156B CN112636156B CN202011551547.2A CN202011551547A CN112636156B CN 112636156 B CN112636156 B CN 112636156B CN 202011551547 A CN202011551547 A CN 202011551547A CN 112636156 B CN112636156 B CN 112636156B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0071—Beam steering, e.g. whereby a mirror outside the cavity is present to change the beam direction
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1123—Q-switching
- H01S3/115—Q-switching using intracavity electro-optic devices
Abstract
The invention provides a satellite-borne large-energy dual-wavelength all-solid-state pulse laser which comprises an active Q-switched oscillator, a pre-power amplifier, a main power amplifier and a frequency doubling module, wherein the active Q-switched oscillator is a U-shaped resonant cavity and comprises a first security prism, a first optical wedge, a first wave plate, a slab crystal, a first polarization splitting prism, a second polarization splitting prism, an electro-optical Q switch, a second wave plate, a second optical wedge, a second security prism and a pump diode array arranged on the slab crystal, and the pre-power amplifier and the main power amplifier both comprise beam shaping mirror groups. The invention can realize the output of large-energy, high-stability and high-reliability pulse laser, reduce the volume and the weight of the laser, is suitable for multi-platform application, particularly a satellite-borne platform, and can be used as detection light sources of a satellite-borne aerosol detection laser radar, a satellite-borne distance measurement laser radar and the like.
Description
Technical Field
The invention relates to the technical field of lasers, in particular to a satellite-borne large-energy dual-wavelength all-solid-state pulse laser.
Background
Lidar is an active remote sensing technology. Because the laser radar has the advantages of high detection precision and high resolution, all-weather working, small size, light weight and the like, the laser radar is widely applied to the aspects of distance measurement, mapping, environment monitoring and the like. The satellite-borne laser radar is a laser radar load applied to a satellite or a spacecraft, and is mainly applied to aspects of laser ranging, laser remote sensing and the like at present. The core of the satellite-borne laser radar is a detection light source space laser thereof. Due to the particularity of the application environment, the design of the space laser needs to comprehensively consider the severe space environment, limited satellite resources, non-maintainability and the like, and is specially designed in the aspects of reliability, environmental adaptability, weight, volume, power consumption, component selection and the like.
In the prior art, in the scheme 1, the resonant cavity adopts a U-shaped cavity of an orthogonal paul, and includes a paul prism, a dove prism and a paul prism, wherein the dove prism is adopted to turn a light path. The gain medium and the electro-optical Q-switch are respectively arranged on the reflecting arm and the output arm, and the gain medium is a slab structure crystal. The pumping mode adopts the side pumping of a pulse laser diode. A wave plate is input in front of the Porro prism on the transmitting arm and used for adjusting the reflectivity. A wave plate is inserted in front of the Porro prism on the output arm and used for adjusting the reflectivity; inserting a half wave plate behind the dove prism for changing the polarization state of the laser in the cavity; and a Brewster plate are inserted for realizing Q-switching and polarization coupling output. The proportion of the laser S light in the cavity can be adjusted by adjusting the voltage applied to the electro-optical Q switch, so that the adjustment of the output transmittance is realized. Electro-optic Q-switches operate at relatively low voltages, typically around kilovolts.
In the prior art, in the scheme 2, the resonant cavity adopts a Z-shaped cavity of an orthogonal paul, and includes a paul prism, a polarization splitting prism PBS and a paul prism, where the PBS is used to turn a light path. Gain medium and electro-optical Q-switch are respectively placed on output arm and reflecting arm, and the gain medium can be made into bar-like or plate-like structure. The pumping mode adopts the side pumping of a pulse laser diode. The electro-optical Q-switch works at half-wave voltage (about three thousand to four kilovolts), a wave plate is inserted into the reflecting arm for adjusting effective reflectivity, and a quarter-wave plate is inserted into the output arm for adjusting coupling output rate.
The shortcomings of the prior art scheme 1 are that the resonant cavity adopts two Brewster plates to realize polarized laser output, a laser output light path is not coaxial with the optical axis of the resonant cavity, laser is output at an angle, miniaturization is not facilitated, the laser is large in size and heavy in weight, and more satellite resources are occupied.
The disadvantage of prior art scheme 2 is that the electro-optic Q-switch operates at half-wave voltage, approximately three thousand to four kilovolts. Due to the limitation of space environment and on-satellite components, the high-voltage output of three or four kilovolts is difficult to realize by on-satellite products, the technical difficulty is too high, and the on-satellite high-voltage output device is not suitable for application of on-satellite products.
Disclosure of Invention
The invention provides a satellite-borne large-energy dual-wavelength all-solid-state pulse laser for solving the problem of satellite-borne miniaturized laser output, wherein a quadrature Paul prism cavity is adopted to improve the stability of an optical path, the voltage of an electro-optical Q switch is adjusted to realize the adjustment of the output coupling transmittance of a resonant cavity and reduce the working voltage, and two PBSs are adopted to realize the turning of the optical path, thereby realizing the miniaturization and compactness of the laser. The invention can realize the output of large-energy, high-stability and high-reliability pulse laser, reduce the volume and the weight of the laser, is suitable for multi-platform application, particularly a satellite-borne platform, and can be used as detection light sources of a satellite-borne aerosol detection laser radar, a satellite-borne distance measurement laser radar and the like.
The invention provides a satellite-borne large-energy dual-wavelength all-solid-state pulse laser which comprises an active Q-switched oscillator, a pre-power amplifier, a main power amplifier and a frequency doubling module, wherein the active Q-switched oscillator is used for outputting oscillating light with high beam quality, the pre-power amplifier is used for outputting the oscillating light after beam shaping and primary power amplification are carried out on the oscillating light, the main power amplifier is used for outputting laser after beam shaping and secondary power amplification are carried out on the oscillating light, and the frequency doubling module is used for generating dual-wavelength laser;
the active Q-switched oscillator is a U-shaped resonant cavity and comprises a first Porro prism, a first optical wedge, a first wave plate, a slab crystal, a first polarization beam splitter prism, a second polarization beam splitter prism, an electro-optic Q switch, a second wave plate, a second optical wedge, a second Porro prism and a pump diode array arranged on the slab crystal, wherein the first polarization beam splitter prism and an output light path of the slab crystal form 45 degrees, the second polarization beam splitter prism and an output light path of the first polarization beam splitter prism form 45 degrees, the first Porro prism and a rear edge of the second Porro prism are orthogonally arranged, and the first Porro prism and the second Porro prism form 45 degrees with an optical axis.
The invention relates to a satellite-borne high-energy dual-wavelength all-solid-state pulse laser, which is used as a preferred mode, wherein a lath crystal is connected on an oxygen-free copper heat sink by using indium welding;
the first optical wedge and the second optical wedge are used for adjusting an optical path in the U-shaped resonant cavity, pump light emitted by the pump diode array directly irradiates on the slab crystal, the first wave plate is used for compensating phase delay caused by the first Porro prism on incident S polarized light, the first polarization beam splitter prism and the second polarization beam splitter prism are used for conducting optical path turning, the electro-optical Q switch is used for adjusting output coupling transmittance of the U-shaped resonant cavity through voltage, the second wave plate is used for compensating phase delay caused by the second Porro prism on the S polarized light, and the second polarization beam splitter prism is used for forming laser oscillation and outputting the oscillation light to the outside of the U-shaped resonant cavity.
The invention relates to a satellite-borne high-energy dual-wavelength all-solid-state pulse laser, which is used as a preferred mode, wherein a pre-power amplifier comprises a first reflector, an isolator, an 1/2 wave plate, a second reflector, a first beam shaping mirror group and a pre-power amplifier module which are sequentially arranged;
the first reflector forms an angle of 45 degrees with the output light path of the second polarization splitting prism, and the second reflector forms an angle of 45 degrees with the output light path of the 1/2 wave plate;
the first reflector is used for reflecting the oscillation light output by the active Q-switched oscillator to the isolator, the isolator is used for preventing the laser generated by the pre-power amplifier from reversely entering the active Q-switched oscillator, and the 1/2 wave plate is used for adjusting the phase of the oscillation light after passing through the isolator; the first beam shaping mirror group is used for expanding and shaping the oscillation light and outputting the expanded and shaped oscillation light to the pre-power amplifier module; the pre-power amplifier module is used for performing primary power amplification on the oscillation light and outputting laser.
The invention relates to a satellite-borne large-energy dual-wavelength all-solid-state pulse laser, which is used as a preferred mode, wherein a main power amplifier comprises a second beam shaping mirror group, a third reflector, a fourth reflector and a main power amplifier module which are sequentially arranged;
the third reflector forms an angle of 45 degrees with the output light path of the second beam shaping mirror group, and the fourth reflector forms an angle of 45 degrees with the output light path of the third reflector;
the second beam shaping mirror group is used for shaping and outputting the laser output by the pre-power amplifier module, the third reflector and the fourth reflector are used for turning the laser light path output by the second beam shaping mirror group, and the main power amplifier module is used for carrying out secondary power amplification and outputting on the laser.
The invention relates to a satellite-borne high-energy dual-wavelength all-solid-state pulse laser, which is characterized in that a lath crystal is solid Nd, YAG, as a preferred mode; the pre-power amplifier module and the main power amplifier module are both LD array side pump Nd: YAG slab amplifier.
As an optimal mode, the main power amplifier module is used for outputting 1064nm laser.
The invention relates to a satellite-borne high-energy dual-wavelength all-solid-state pulse laser, wherein as an optimal mode, a frequency doubling module comprises an 1/2 wave plate, a third beam shaping mirror group and a frequency doubling crystal which are sequentially arranged;
the 1/2 wave plate is used for adjusting the phase of the 1064nm laser and outputting the laser; the third beam shaping mirror group is used for expanding and outputting 1064nm laser, and the frequency doubling crystal is used for doubling the frequency of the 1064nm laser and outputting dual-wavelength laser.
The invention relates to a satellite-borne high-energy dual-wavelength all-solid-state pulse laser, which is an optimal mode, wherein dual-wavelength laser is 1064nm laser and 532nm laser.
As an optimal mode, a first Porro prism, a first wave plate, a slab crystal, a first polarization beam splitter prism, a second polarization beam splitter prism, an electro-optic Q switch, a second wave plate, a second Porro prism and a pumping diode array all adopt fixed structure clamps; the first optical wedge and the second optical wedge are both provided with adjustable structure clamps.
As an optimal mode, the active Q-switched oscillator, the pre-power amplifier, the main power amplifier and the frequency doubling module all adopt modular structures.
When the electro-optical Q switch is not pressurized, S polarized light reflected from the second Porro prism is changed into P polarized light after passing through the second wave plate, and the P polarized light is completely output through the second polarization beam splitter prism, and at the moment, the resonant cavity is in a high-loss state and no laser is output; when the electro-optical Q switch is in a pressurized state, after P polarized light passes through the pressurized electro-optical Q switch, a part of S light components are reflected back to the gain arm through the first polarization beam splitter prism and the second polarization beam splitter prism to form laser oscillation, and the rest P light components pass through the outside of an output cavity of the second polarization beam splitter prism to form laser output. The output transmittance of the cavity can be varied by adjusting the voltage applied across the electro-optic Q-switch. The invention can reduce the voltage applied on the electro-optical Q switch from three-four kilovolts to about several hundred volts, greatly reduces the development difficulty of the electro-optical Q switch drive and improves the reliability thereof.
The oscillating light enters the pre-power amplifier after being bent by the first reflector, so that the mass and the volume of the laser can be effectively reduced, and resources on a satellite are saved. The first beam shaping mirror group in the pre-power amplifier expands and shapes the oscillation light and then enters the pre-power amplifier module, so that the extraction efficiency of the pre-power amplifier module can be effectively improved, and the peak power density of the laser output by the pre-power amplifier is reduced.
The third reflector and the fourth reflector realize the light path deflection, so that the mass and the volume of the laser can be effectively reduced, and the resources on the satellite are saved. The second beam shaping mirror group in the main power amplifier reshapes the laser amplified by the pre-power and then enters the main power amplifier module, so that the extraction efficiency of the pre-power amplifier module can be effectively improved, the peak power density of the laser output by the main power amplifier is reduced, the peak power density of the laser output by the main power amplifier is ensured to be smaller than the damage threshold of the film coating layers of the optical component 1/2 wave plate and the third beam shaping mirror group in the rear light path, and the margin is reserved, so that the reliability of the laser is improved, and the service life of the laser is prolonged.
The second beam shaping mirror group can expand the laser output by the main power amplifier again and then enter the frequency doubling crystal, so that the peak power density of the laser output by the main power amplifier can be effectively reduced, the peak power density of the laser output by the second beam shaping mirror group is ensured to be smaller than the damage threshold of a film coating layer of the frequency doubling crystal of the optical component in a rear light path, and the margin is reserved, so that the reliability of the laser can be effectively improved, and the service life of the laser can be effectively prolonged.
The key point of the invention is that the design is optimized on the basis of the traditional orthogonal Paul prism resonant cavity, two PBS (polarization beam splitter prism) are adopted to convert the light path, the traditional two Brewster plates are replaced, the coaxial polarization laser output can be realized, and the miniaturization of the structure is easy to realize; meanwhile, the output transmittance of the resonant cavity is changed by adjusting the voltage applied to the electro-optical Q switch, so that the driving voltage of the Q switch is greatly reduced; through reasonable beam shaping, the peak power density of the laser is reduced, the reliability of the laser is improved, and the service life of the laser is prolonged. Through two-stage power amplification of the pre-power amplifier and the main power amplifier, hundreds mJ to 1J magnitude 1064nm fundamental frequency light output can be realized; the output of the maximum 500mJ of dual-wavelength of 1064nm and 532nm can be realized through the frequency doubling crystal.
The invention has the following advantages:
(1) the invention adopts the orthogonal Paul prism cavity to improve the stability of the light path, has high-performance mechanical stability, can eliminate the alignment disorder caused by impact and vibration, can effectively solve the problems of poor adaptability, poor reliability and poor thermal stability of the laser in severe application environments, simultaneously adopts fixed structure clamps for other optical devices except the adjustable optical wedge in the resonant cavity, has strong environmental adaptability and is suitable for space environment application; the output coupling transmittance of the resonant cavity is adjusted by adjusting the voltage of the electro-optical Q switch, the working voltage of the electro-optical Q switch is reduced from thousands of volts to hundreds of volts, the technical risk is greatly reduced, the use of a high-voltage component on a satellite is avoided, and the reliability of the laser is improved; the two PBSs are adopted to realize the turning of the light path, so that the miniaturization and compactness of the laser are realized, the volume and the weight of the laser are reduced, and the resources on a satellite are saved.
(2) The pre-power amplifier and the main power amplifier adopt a one-way absorption and double-sided pumping mode, and the LD array is positioned at the footprint of the Zigzag light path, so that the electro-optic conversion efficiency of the power amplifier can be effectively improved, the power supply utilization rate of a satellite is improved, and resources on the satellite are saved; the power amplifier slab crystal is welded on the oxygen-free copper heat sink in an indium welding mode, heat generated by the power amplifier slab crystal is dissipated in a conduction mode, the thermal lens effect of the slab crystal can be effectively controlled, and the stability of the output energy of the power amplifier is improved.
(3) The invention can realize the output of large-energy high-stability high-reliability pulse laser, and can realize the output of larger-energy laser by increasing the size of the slab gain medium, the power of the pumping diode array and proper beam shaping. The resonant cavity has strong environmental adaptability, low electro-optical Q-switching voltage, compact structure and small volume, and is suitable for space environment application.
(4) The invention can realize high-stability pulse space lasers with various energy levels by the laser crystals with different sizes and the pump sources matched with the laser crystals.
(5) The invention is suitable for multi-platform application, in particular to a satellite-borne platform, and can be used as detection light sources of a satellite-borne aerosol detection laser radar, a satellite-borne range finding laser radar and the like.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment 1 of a satellite-borne high-energy dual-wavelength all-solid-state pulsed laser;
fig. 2 is a schematic structural diagram of an embodiment 2 of a satellite-borne high-energy dual-wavelength all-solid-state pulsed laser.
Reference numerals:
1. an active Q-switched oscillator; 11. a first compass prism; 12. a first optical wedge; 13. a first wave plate; 14. a slab crystal; 15. a first polarization splitting prism; 16. a second polarization beam splitter prism; 17. an electro-optic Q-switch; 18. a second wave plate; 19. a second optical wedge; 1a, a second Paul prism; 1b, a pumping diode array; 2. a pre-power amplifier; 21. a first reflector; 22. an isolator; 23. 1/2 a wave plate; 24. a second reflector; 25. a first beam shaping mirror group; 26. a pre-power amplifier module; 3. a main power amplifier; 31. a second beam shaping mirror group; 32. a third reflector; 33. a fourth mirror; 34. a main power amplifier module; 4. a frequency doubling module; 41. 1/2 a wave plate; 42. a third beam shaping mirror group; 43. frequency doubling crystals.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1
As shown in fig. 1, a satellite-borne large-energy dual-wavelength all-solid-state pulse laser includes an active Q-switched oscillator 1 for outputting high-beam-quality oscillation light, a pre-power amplifier 2 for outputting the oscillation light after beam shaping and primary power amplification, a main power amplifier 3 for outputting laser light after beam shaping and secondary power amplification of the oscillation light, and a frequency doubling module 4 for generating dual-wavelength laser, which are sequentially arranged;
the active Q-switched oscillator 1 is a U-shaped resonant cavity, the active Q-switched oscillator 1 comprises a first Porro prism 11, a first optical wedge 12, a first wave plate 13, a slab crystal 14, a first polarization beam splitter prism 15, a second polarization beam splitter prism 16, an electro-optical Q switch 17, a second wave plate 18, a second optical wedge 19, a second Porro prism 1a and a pump diode array 1b arranged on the slab crystal 14, the first polarization beam splitter prism 15 forms a 45-degree angle with the output light path of the slab crystal 14, the second polarization beam splitter prism 16 forms a 45-degree angle with the output light path of the first polarization beam splitter prism 15, the first Porro prism 11 is orthogonally arranged with the rear edge of the second Porro prism 1a, and both the first Porro prism 11 and the second Porro prism 1a form a 45-degree angle with the optical axis.
Example 2
As shown in fig. 2, a satellite-borne large-energy dual-wavelength all-solid-state pulse laser includes an active Q-switched oscillator 1 for outputting high-beam-quality oscillation light, a pre-power amplifier 2 for outputting the oscillation light after beam shaping and primary power amplification, a main power amplifier 3 for outputting laser light after beam shaping and secondary power amplification of the oscillation light, and a frequency doubling module 4 for generating dual-wavelength laser, which are sequentially arranged;
the active Q-switched oscillator 1 is a U-shaped resonant cavity, the active Q-switched oscillator 1 comprises a first Porro prism 11, a first optical wedge 12, a first wave plate 13, a slab crystal 14, a first polarization beam splitter prism 15, a second polarization beam splitter prism 16, an electro-optic Q switch 17, a second wave plate 18, a second optical wedge 19, a second Porro prism 1a and a pump diode array 1b arranged on the slab crystal 14, the first polarization beam splitter prism 15 forms 45 degrees with the output light path of the slab crystal 14, the second polarization beam splitter prism 16 forms 45 degrees with the output light path of the first polarization beam splitter prism 15, the first Porro prism 11 is orthogonally arranged with the rear edge of the second Porro prism 1a, and the first Porro prism 11 and the second Porro prism 1a form 45 degrees with the optical axis;
the slab crystal 14 is connected to the oxygen-free copper heat sink by indium welding;
the first optical wedge 12 and the second optical wedge 19 are used for adjusting an optical path in the U-shaped resonant cavity, the pumping light emitted by the pumping diode array 1b directly irradiates on the slab crystal 14, the first wave plate 13 is used for compensating phase delay of the first Porro prism 11 caused by incident S polarized light, the first polarization beam splitter prism 15 and the second polarization beam splitter prism 16 are used for performing optical path turning, the electro-optical Q switch 17 is used for adjusting output coupling transmittance of the U-shaped resonant cavity through voltage, the second wave plate 18 is used for compensating phase delay of the second Porro prism 1a caused by S polarized light, and the second polarization beam splitter prism 16 is used for forming laser oscillation and outputting oscillation light to the outside of the U-shaped resonant cavity;
the pre-power amplifier 2 comprises a first reflector 21, an isolator 22, an 1/2 wave plate 23, a second reflector 24, a first beam shaping mirror group 25 and a pre-power amplifier module 26 which are arranged in sequence;
the first reflector 21 and the output optical path of the second polarization beam splitter prism 16 form an angle of 45 degrees, and the second reflector 24 and the output optical path of the 1/2 wave plate 23 form an angle of 45 degrees;
the first reflector 21 is used for reflecting the oscillation light output by the active Q-switched oscillator 1 to the isolator 22, the isolator 22 is used for preventing the laser light generated by the pre-power amplifier 2 from reversely entering the active Q-switched oscillator 1, and the 1/2 wave plate 23 is used for adjusting the phase of the oscillation light after passing through the isolator 22; the first beam shaping mirror group 25 is used for expanding and shaping the oscillation light and outputting the expanded oscillation light to the pre-power amplifier module 26; the pre-power amplifier module 26 is configured to perform primary power amplification on the oscillation light and output laser light;
the main power amplifier 3 comprises a second beam shaping mirror group 31, a third reflector 32, a fourth reflector 33 and a main power amplifier module 34 which are arranged in sequence;
the third reflector 32 forms an angle of 45 degrees with the output light path of the second beam shaping mirror group 31, and the fourth reflector 33 forms an angle of 45 degrees with the output light path of the third reflector 32;
the second beam shaping mirror group 31 is used for shaping and outputting the laser output by the pre-power amplifier module 26, the third reflector 32 and the fourth reflector 33 are used for turning the laser light path output by the second beam shaping mirror group 31, and the main power amplifier module 34 is used for performing secondary power amplification and outputting on the laser;
the slab crystal 14 is solid Nd: YAG; both the pre-power amplifier module 26 and the main power amplifier module 34 are LD array side-pumped Nd: a YAG slab amplifier;
the main power amplifier module 34 is used for outputting 1064nm laser;
the frequency doubling module 4 comprises an 1/2 wave plate 41, a third beam shaping mirror group 42 and a frequency doubling crystal 43 which are arranged in sequence;
1/2 wave plate 41 is used to adjust the phase of 1064nm laser and output; the third beam shaping mirror group 42 is used for outputting the 1064nm laser after expanding the beam, and the frequency doubling crystal 43 is used for outputting the dual-wavelength laser after frequency doubling the 1064nm laser;
the dual-wavelength laser is 1064nm laser and 532nm laser;
the first Porro prism 11, the first wave plate 13, the slab crystal 14, the first polarization beam splitter prism 15, the second polarization beam splitter prism 16, the electro-optical Q switch 17, the second wave plate 18, the second Porro prism 1a and the pumping diode array 1b all adopt fixed structure clamps; the first optical wedge 12 and the second optical wedge 19 both adopt adjustable structure clamps;
the active Q-switched oscillator 1, the pre-power amplifier 2, the main power amplifier 3 and the frequency doubling module 4 all adopt modular structures.
When the electro-optical Q-switch 17 is not pressurized, the S-polarized light reflected from the second Porro prism 1a passes through the second wave plate 18 and becomes P-polarized light, and is completely output through the second polarization beam splitter prism 16, and at this time, the resonant cavity is in a high loss state and no laser is output; when the electro-optical Q-switch 17 is in a pressurized state, after the P-polarized light passes through the pressurized electro-optical Q-switch 17, a part of the S light component is reflected back to the gain arm through the first polarization splitting prism 15 and the second polarization splitting prism 16 to form laser oscillation, and the rest of the P light component passes through the second polarization splitting prism 16 and out of the output cavity to form laser output.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. The utility model provides a full solid pulse laser of satellite-borne big energy dual wavelength which characterized in that: the laser oscillator comprises an active Q-switched oscillator (1) which is used for outputting high-beam-quality oscillating light, a pre-power amplifier (2) which is used for outputting the oscillating light after beam shaping and primary power amplification, a main power amplifier (3) which is used for outputting laser after beam shaping and secondary power amplification are carried out on the oscillating light, and a frequency doubling module (4) which is used for generating dual-wavelength laser, wherein the active Q-switched oscillator (1) is sequentially arranged;
the active Q-switched oscillator (1) is a U-shaped resonant cavity, the active Q-switched oscillator (1) comprises a first Porro prism (11), a first optical wedge (12), a first wave plate (13), a slab crystal (14), a first polarization beam splitter prism (15), a second polarization beam splitter prism (16), an electro-optical Q switch (17), a second wave plate (18), a second optical wedge (19), a second Porro prism (1a) and a pump diode array (1b) arranged on the slab crystal (14), the output light path of the first polarization beam splitter prism (15) and the output light path of the slab crystal (14) form 45 degrees, the output light path of the second polarization beam splitter prism (16) and the first polarization beam splitter prism (15) form 45 degrees, and the rear edges of the first Porro prism (11) and the second Porro prism (1a) are orthogonally arranged, the first Porro prism (11) and the second Porro prism (1a) are both 45 degrees from the optical axis.
2. A satellite-borne high-energy dual-wavelength all-solid-state pulsed laser according to claim 1, characterized in that:
the slab crystal (14) is connected to the oxygen-free copper heat sink by indium welding;
the first optical wedge (12) and the second optical wedge (19) are used for adjusting the optical path in the U-shaped resonant cavity, the pump light emitted by the pump diode array (1b) directly impinges on the slab crystal (14), the first wave plate (13) is used for compensating the phase delay of the first prism (11) caused by the incident S-polarized light, the first polarization beam splitter prism (15) and the second polarization beam splitter prism (16) are used for carrying out light path turning, the electro-optical Q switch (17) is used for adjusting the output coupling transmittance of the U-shaped resonant cavity through voltage, the second wave plate (18) is used for compensating the phase retardation of the S polarized light caused by the second Paul prism (1a), the second polarization beam splitter prism (16) is used for forming laser oscillation and outputting the oscillation light to the outside of the U-shaped resonant cavity.
3. A satellite-borne high-energy dual-wavelength all-solid-state pulsed laser according to claim 1, characterized in that: the pre-power amplifier (2) comprises a first reflector (21), an isolator (22), an 1/2 wave plate (23), a second reflector (24), a first beam shaping mirror group (25) and a pre-power amplifier module (26) which are arranged in sequence;
the first reflecting mirror (21) is arranged at an angle of 45 degrees with the output light path of the second polarization splitting prism (16), and the second reflecting mirror (24) is arranged at an angle of 45 degrees with the output light path of the 1/2 wave plate (23);
the first reflector (21) is used for reflecting the oscillation light output by the active Q-switched oscillator (1) to the isolator (22), the isolator (22) is used for preventing the laser light generated by the pre-power amplifier (2) from reversely entering the active Q-switched oscillator (1), and the 1/2 wave plate (23) is used for adjusting the phase of the oscillation light after passing through the isolator (22); the first beam shaping mirror group (25) is used for performing beam expanding and shaping on the oscillating light and outputting the oscillating light to the pre-power amplifier module (26); the pre-power amplifier module (26) is used for performing primary power amplification on the oscillating light and outputting laser.
4. A satellite-borne high-energy dual-wavelength all-solid-state pulsed laser according to claim 3, characterized in that: the main power amplifier (3) comprises a second beam shaping mirror group (31), a third reflector (32), a fourth reflector (33) and a main power amplifier module (34) which are arranged in sequence;
the third reflector (32) and the output light path of the second beam shaping mirror group (31) form an angle of 45 degrees, and the fourth reflector (33) and the output light path of the third reflector (32) form an angle of 45 degrees;
the second beam shaping mirror group (31) is used for shaping and outputting the laser output by the pre-power amplifier module (26), the third reflector (32) and the fourth reflector (33) are used for turning the laser light path output by the second beam shaping mirror group (31), and the main power amplifier module (34) is used for carrying out secondary power amplification and outputting on the laser.
5. The satellite-borne large-energy dual-wavelength all-solid-state pulse laser according to claim 4, wherein: the slab crystal (14) is solid Nd: YAG; the pre-power amplifier module (26) and the main power amplifier module (34) are both LD array side-pumped Nd: YAG slab amplifier.
6. The satellite-borne large-energy dual-wavelength all-solid-state pulse laser according to claim 4, wherein: the main power amplifier module (34) is used for outputting 1064nm laser.
7. A satellite-borne high-energy dual-wavelength all-solid-state pulsed laser according to claim 6, characterized in that: the frequency doubling module (4) comprises an 1/2 wave plate (41), a third beam shaping mirror group (42) and a frequency doubling crystal (43) which are arranged in sequence;
the 1/2 wave plate (41) is used for adjusting the phase of the 1064nm laser and outputting the laser; the third beam shaping mirror group (42) is used for outputting the 1064nm laser after expanding the beam, and the frequency doubling crystal (43) is used for outputting the dual-wavelength laser after frequency doubling the 1064nm laser.
8. A satellite-borne high-energy dual-wavelength all-solid-state pulsed laser according to claim 7, characterized in that: the dual-wavelength laser is 1064nm laser and 532nm laser.
9. A satellite-borne high-energy dual-wavelength all-solid-state pulsed laser according to any one of claims 1 to 8, characterized in that: the first Porro prism (11), the first wave plate (13), the slab crystal (14), the first polarization beam splitter prism (15), the second polarization beam splitter prism (16), the electro-optical Q-switch (17), the second wave plate (18), the second Porro prism (1a) and the pump diode array (1b) are all fixed structure clamps; the first optical wedge (12) and the second optical wedge (19) both adopt adjustable structure clamps.
10. A satellite-borne large-energy dual-wavelength all-solid-state pulsed laser according to any one of claim 9, wherein: the active Q-switched oscillator (1), the pre-power amplifier (2), the main power amplifier (3) and the frequency doubling module (4) all adopt modular structures.
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