34 results about "Slab laser" patented technology

The invention provides an all-solid-state high-power single-frequency laser based on an optical fiber-slab mixed structure, and relates to the technical field of solid lasers, and the all-solid-state high-power single-frequency laser comprises an all-solid-state continuous single-frequency seed module, an optical fiber pulse modulation module, an optical fiber pre-amplification module, a slab laser pre-amplification module, a slab laser main amplification module and a frequency multiplication module which are sequentially arranged; the lath laser pre-amplifier and the lath laser main amplifier are used for compensating thermally induced aberration generated by lath laser through multi-pass amplification designed according to the spherical aberration self-compensation principle, and then the quality of light beams is improved. In addition, a discrete mirror group is adopted to replace a complete amplifier cavity mirror, spontaneous radiation and parasitic oscillation in the working process of the amplifier are effectively restrained, nearly hundred mJ-magnitude single-frequency pulse laser with excellent light beam quality can be obtained, and application to laser radar detection or industry can be met.

The invention discloses an all-solid-state debugging-free slab laser based on an orthogonal Porro prism, and belongs to the technical field of solid laser. The diode stack array is used as a pumping source; the pumping shaping system performs homogenization shaping on the slow axis direction of the diode stack array; the coupling cavity mirror introduces the shaped light field into the lath laser crystal, and is used as an oscillation laser reflector at the same time; the ridges of the first Porro prism and the second Porro prism are mutually orthogonal; a light field introduced into the slab laser crystal reaches the first Porro prism through the polaroid, enters the coupling cavity mirror through the polaroid after being reflected, is subjected to repeated reciprocating oscillation on the end face where the coupling cavity mirror is located and the end face where the first reflector and the second reflector which are longitudinally arranged are located to reach the second Porro prism, and then returns to the first Porro prism along the original path; and the light is output by the polaroid. Large single pulse energy can be output based on a single resonant cavity, cascade amplification is not needed, the system size compactness is very high, and the photoelectric conversion efficiency is high.

The invention discloses an air-cooled miniature slab laser based on double-end pumping, and belongs to the technical field of solid laser. Wherein the first conduction cooling single bar and the second conduction cooling single bar are arranged at the upper end and the lower end of the lath laser crystal in a staggered manner to form a double-end pumping structure; after the first fast axis collimation cylindrical lens and the second fast axis collimation cylindrical lens respectively collimate the fast axis directions of the first conduction cooling single bar and the second conduction cooling single bar, partial end surfaces are injected into the lath laser crystal; the first resonant cavity reflector and the second resonant cavity reflector are located at the left end and the right end of the lath laser crystal; the laser injected into the slab laser crystal passes through the resonant cavity mirror and then is subjected to multi-pass back-and-forth oscillation between the first resonant cavity reflector and the second resonant cavity reflector to reach the resonant cavity output cavity mirror. The output monopulse energy is greatly improved, the overall electro-optical efficiency is high, and the system compactness is high.

The invention discloses a high-power torsional mode cavity single-frequency laser based on a slab crystal, which belongs to the technical field of solid lasers and comprises two pumping sources, two pumping shaping mirror groups, two reflectors, a slab laser crystal, three quarter-wave plates, an electro-optic Q-switched crystal, a polarizer, a total reflection plano-concave cavity mirror and an output cavity mirror. Pump light emitted by the two pump sources passes through the two pump shaping lens sets and then passes through the two reflectors to be injected into the lath laser crystal, and the first quarter-wave plate and the third quarter-wave plate are combined to achieve the torsional mode cavity technology. The electro-optic Q-switched crystal, the second quarter-wave plate and the polarizer which are sequentially arranged are combined to modulate continuous light in the resonant cavity into pulsed light, and the total reflection plano-concave cavity mirror and the output cavity mirror are combined to serve as a cavity mirror of the resonant cavity. According to the invention, the existing pumping power limited to tens of watts can be improved to hundreds of watts, the existing single-frequency laser power limited to watt level can be improved to tens of watts, and the cooperative improvement of high power and single-frequency characteristics is realized.

The application provides a function gradient doped slab laser device, and relates to the technical field of solid-state lasers.The device comprises a pump source, a pump light shaping element and a laser material.The pump light output by the pump source is guided into the laser material through the pump light shaping element, so that the pump light activates the active ions in the laser material to generate laser light.The doping concentration of the laser material satisfies a pre-set doping concentration function, which is used to represent that the materials at different positions in the laser material correspond to different doping concentrations.The technical scheme provided by the application precisely controls the doping concentration of the laser material.Under the condition that the total heat power is unchanged, the temperature distribution of the laser material along the thickness direction is closer to a uniform distribution state, the thermal gradient and thermal effect of the laser material can be reduced, the thermal deformation and thermal stress of the laser material caused by the temperature gradient can be reduced, and the stability and reliability of the function gradient doped slab laser device in operation can be improved.

The application discloses a slab laser and a fixing method thereof, and relates to the technical field of slab lasers. The slab laser comprises a laser shell, a slab assembly, a first ceramic sheet, a second ceramic sheet, a wedge-shaped block and a fastener. The laser shell has a resonant cavity which is in communication with the outside. The slab assembly is arranged in the resonant cavity. The heat generated by the operation of the slab assembly is conducted to the outside of the laser shell through the second ceramic sheet and the wedge-shaped block on one side, and is conducted to the outside through the laser shell on the other side, so that the temperature of the slab assembly is maintained at a low state. The slab laser will not be distorted due to the excessive temperature difference caused by the asymmetric heat dissipation. In addition, the structure of the slab laser is simple, the use of screw holes is reduced, and the processing cost is saved.

This disclosure discloses an internal liquid-cooled laser crystal assembly for a medical laser. One specific embodiment of this internal liquid-cooled laser crystal assembly includes a rectangular slab laser crystal and a fixing device for clamping the slab laser crystal. The contact surface between the fixing device and the slab laser crystal is sealed at the edge. The slab laser crystal has coolant channels parallel to the clamping direction, arranged in two rows along the crystal thickness direction. The thickness of the slab laser crystal and the spacing between two adjacent coolant channels in the same row have a first preset relationship, and the thickness of the coolant channels has a second preset relationship. The slab laser crystal has two optically grade polished surfaces, respectively coated with antireflection films for the pump light and the emitted laser, as light-transmitting end faces. The fixing device has a liquid passage hole. By creating coolant channels within the slab laser crystal, the risk of crystal wavefront distortion is reduced. This improves the energy stability of the laser output.

The utility model provides a double-end pumping slab laser amplifier based on temperature control, which comprises end face pumping laser modules respectively arranged at two ends of a slab heat sink module, and the end face pumping laser modules and the slab heat sink module are connected with a temperature detection assembly and a temperature control assembly. The temperature detection assembly comprises a first temperature probe used for monitoring the temperature of the end face pumping laser module, a second temperature probe used for monitoring the side face of the lath gain medium, and a third temperature probe used for monitoring the top face of the lath gain medium. The temperature control assembly comprises a first water cooling device and a fourth water cooling device which are used for adjusting the temperature of the end face pumping laser module, and further comprises a second water cooling device and a third water cooling device which are used for adjusting the temperature of the lath heat sink module. And the slab gain medium fully absorbs the pump light, so that the damage risk caused by escape of the pump light is reduced.

This invention discloses a high-power torsional mode cavity single-frequency laser based on a slab crystal, belonging to the field of solid-state laser technology. It includes: two pump sources, two pump shaping mirror groups, two mirrors, a slab laser crystal, three quarter-wave plates, an electro-optic Q-switched crystal, a polarizer, a total internal reflection plano-concave cavity mirror, and an output cavity mirror. Pump light emitted from the two pump sources passes through the two pump shaping mirror groups, then through the two mirrors, and is injected into the slab laser crystal. The combination of the first and third quarter-wave plates realizes the torsional mode cavity technology. The sequentially arranged electro-optic Q-switched crystal, second quarter-wave plate, and polarizer modulate the continuous light in the resonant cavity into pulsed light. The total internal reflection plano-concave cavity mirror and the output cavity mirror serve as the cavity mirrors of the resonant cavity. This invention can increase the pump power, currently limited to tens of watts, to hundreds of watts, and the single-frequency laser power, currently limited to watts, to tens of watts, achieving a synergistic improvement in high power and single-frequency characteristics.

The invention discloses a three-dimensional composite structure slab laser performance simulation implementation system and method, and belongs to the technical field of solid lasers. The implementation method comprises the steps of obtaining a to-be-simulated target parameter; the target is used for calculating the pump light intensity and the laser light intensity of a specific position so as to calculate the output power of the pump light intensity and the laser light intensity; the pump light intensity, the laser light intensity, the pump light absorption coefficient and the laser gain coefficient of any point on the light beam transmission path are obtained to draw a light power result; and a thermal power result is obtained. The beneficial effects of the invention are that simulation results of related laser structures are provided for optimization and improvement of experimental parameters.

The invention belongs to the technical field of lasers, and relates to a dual-wavelength slab frequency doubling laser which comprises a laser resonant cavity unit and a slab crystal pump unit. The laser resonant cavity unit is provided with a first light path, and a first total reflection mirror, a slab crystal, a first electro-optical Q switch, a first harmonic mirror, a first frequency doubling crystal and a first output mirror are sequentially arranged along the first light path; a second total reflection mirror, a slab crystal, a second electro-optical Q switch, a second harmonic mirror, a second frequency doubling crystal and a second output mirror are sequentially arranged along the second light path; the slab crystal pumping device unit is a side pumping or a large pumping, and comprises a semiconductor laser array and an optical waveguide. The dual-wavelength slab laser has the advantages of high pumping power and high beam quality, and maximum power output is achieved.

The present invention provides a multi-wavelength slab laser and a laser for anti-angiogenesis, which at least include a pump source, a laser crystal, a first cavity mirror, a second cavity mirror and a third cavity mirror, wherein the pump source is used to emit pump light; the laser crystal is used to release laser light after receiving the pump light, and the laser crystal is cut along 545nm, 577nm and 595nm cutting angles respectively; the first cavity mirror and the first crystal surface and the second crystal surface form a first resonant cavity for outputting 545nm laser; the second cavity mirror and the third crystal surface and the fourth crystal surface form a second resonant cavity for outputting 577nm laser; the third cavity mirror and the fifth crystal surface and the sixth crystal surface form a third resonant cavity for outputting 595nm laser; the multi-wavelength slab laser of the present invention can output three or six wavelengths of laser light, avoid the problem of multi-wavelength output mode competition, and is conducive to obtaining a highly integrated and low-cost laser, and has important application scenarios in the fields of biological detection, medical cosmetology, scar treatment, etc.

The invention discloses a regenerative amplifier based on a slab medium and a double-end pumping configuration, and belongs to the technical field of laser technologies and photoelectric devices. The regenerative amplifier comprises a seed source, a modulator, an amplifier, an isolator, a polarization control element, an electro-optic Q-switched crystal, a slab laser crystal, a double-end pumping system and a resonant cavity structure. The amplifier adopts the lath gain medium, heat sinks are bonded on the upper surface and the lower surface to improve the heat dissipation efficiency, the pump light is uniformly distributed in the crystal in combination with a double-end symmetric pumping mode, and the energy utilization rate and the light beam quality are improved. Seed light reciprocates in the resonant cavity for multiple times, and after multi-pass amplification and energy accumulation, cavity emptying is achieved through electro-optical Q-switching control, and high-peak-power laser pulses are output. The problems that a traditional regenerative amplifier is serious in heat effect, uneven in gain, limited in output power and the like are effectively solved, and the regenerative amplifier is suitable for the high-energy laser application fields such as laser micromachining and ultrafast spectrums.

This invention discloses a wind-cooled microslab laser based on dual-end pumping, belonging to the field of solid-state laser technology. The laser comprises a first and a second conductive cooling bar, alternately placed at the top and bottom ends of a slab laser crystal, presenting a dual-end pumping structure. A first and a second fast-axis collimating cylindrical lens collimate the first and second conductive cooling bars along their fast axes, respectively, before partially injecting the laser beams into the slab laser crystal. A first and a second resonant cavity mirror are located at the left and right ends of the slab laser crystal. The laser beam injected into the slab laser crystal undergoes multiple round-trip oscillations between the first and second resonant cavity mirrors after passing through the resonant cavity mirrors, before reaching the output cavity mirror. This invention significantly improves the output single-pulse energy, achieves high overall electro-optical efficiency, and boasts a compact system design.

The invention relates to the technical field of lasers, in particular to a liquid cooling device for a lath laser amplifier crystal. The device comprises a cooling unit, the cooling unit sequentially comprises a water inlet layer, a backflow layer, an exchange layer and a sealing plate, the water inlet layer comprises a plurality of water inlet pipes arranged in a matrix shape, and the other ends of the water inlet pipes penetrate through the backflow layer and are communicated with the exchange layer; the sealing plate separates the exchange layer from the lath laser amplifier crystal and transfers heat between the exchange layer and the lath laser amplifier crystal; a drainage pipe is arranged on the backflow layer, a one-way flowing piece is arranged on the common wall of the backflow layer and the exchange layer and arranged on one side of the water inlet pipe, and liquid for cooling enters the exchange layer from the water inlet pipe and then enters the backflow layer through the one-way flowing piece till being discharged. By arranging the cooling liquid flowing channel perpendicular to the lath laser amplifier crystal, the contact amount and the contact area between the cooling liquid and the crystal in the initial stage are greatly increased, and the temperature difference caused by the too large cooling liquid passing area is prevented.

The application discloses a regenerative amplifier based on a slab medium and a double-end pumping configuration and belongs to the technical field of laser technology and optoelectronic devices. The regenerative amplifier comprises a seed source, a modulator, an amplifier, an isolator, a polarization control element, an electro-optical Q-switching crystal, a slab laser crystal, a double-end pumping system and a resonant cavity structure. The amplifier adopts a slab gain medium, improves the heat dissipation efficiency through the bonding of upper and lower surfaces with heat sinks, uniformly distributes pumping light in the crystal by combining a double-end symmetric pumping mode, and improves energy utilization and beam quality. Seed light repeatedly goes back and forth in the resonant cavity, accumulates energy after multi-pass amplification, and realizes cavity emptying output of high peak power laser pulses through electro-optical Q-switching control. The application effectively solves the problems of the traditional regenerative amplifier, such as serious thermal effect, uneven gain and limited output power, and is suitable for high-energy laser application fields such as laser micro-processing and ultrafast spectroscopy.

The application discloses a kind of hybrid pumping slab laser amplifiers, comprising: slab laser medium, side pumping source and end face pumping source;One end face of slab laser medium is laser incidence face, the other opposite end face is end face pumping face, side is side pumping face;Seed laser is incident at preset angle from laser incidence face, forms total reflection after being incident in side pumping face, and seed laser after total reflection is emitted from end face pumping face;Side pumping face is pumped by side pumping source, and forms elongated pumping area in side pumping face;End face pumping face is pumped by end face pumping source, and the center of end face pumping light is coincident with the center of seed laser, and the spot size of end face pumping light is less than or equal to the spot size of seed laser in the base mode of this face.The seed laser of the application has high mode matching degree with side pumping area, and the end face pumping area strengthens and amplifies the base mode component in seed laser, and high beam quality, high extraction efficiency laser amplification can be obtained.

The application discloses a pumped passive Q-switched laser, characterized in that the pumped passive Q-switched laser comprises a pumping source (1), a laser resonant cavity (2) and a pumped light shaping and coupling device (3), wherein the laser resonant cavity (2) comprises, in sequence along an optical axis, a total reflection mirror (21), a laser gain medium, a passive Q-switched crystal (23) and an output mirror (24); the passive Q-switched crystal (23) is provided with a cooling device (4), and the cooling device (4) is used for dissipating heat of the passive Q-switched crystal (23). The application adds the cooling device (4) on the passive Q-switched crystal (23), dissipates heat of the passive Q-switched crystal (23), keeps the temperature of the passive Q-switched crystal (23), makes the passive Q-switched crystal (23) bear higher intracavity laser power density, and thus the application is applied to a high-power slab laser.

The invention provides a sunlight direct pumping slab laser, and belongs to the field of pumping lasers, the sunlight direct pumping slab laser comprises a laser shell, a sunlight collection system is arranged on the surface or the outer side of the laser shell, and the sunlight collection system is used for collecting sunlight and focusing the collected sunlight; a collimating mirror is arranged on the surface of the laser shell or in the laser shell, the collimating mirror is located at the focus position of light beams output by the sunlight collecting system, a gain batten in a flat cuboid shape is arranged on the output side of the collimating mirror, and a reflection cavity mirror and an output cavity mirror are arranged on the two sides of the gain batten in the length direction respectively. And the output cavity mirror is aligned with a laser output window of the laser shell. The invention has the beneficial effects that the operation cost and the energy consumption of the laser can be obviously reduced, efficient and stable sunlight pumping can be realized, and the output power and the light beam quality of the laser are improved.

The invention discloses a heat dissipation system of a macro-energy lath laser for OHx detection, and belongs to the technical field of macro-energy lath lasers. According to the system, through a series-parallel combined liquid cooling framework, micro-channel topological optimization and a multi-layer composite sealing technology, the problems that a traditional heat dissipation scheme is uneven in temperature, too high in flow resistance and poor in sealing reliability are solved. Main channels are connected in series to ensure that the flow is less than 6L / min, and branches are connected in parallel to realize that the total pressure drop is less than 0.2 MPa; the micro-channel flow channel is subjected to CFD optimization layout, is matched with heat source distribution, and can bear heat flux of more than 500W / cm < 2 >; and a multi-layer sealing structure (the micro-channel copper substrate / Mo-Cu transition layer / AlN ceramic ring) is combined with a double-channel sealing interface, so that a cooling liquid is prevented from leaking to pollute an optical path. According to the invention, the temperature difference is less than 2 DEG C, the wavelength drift is less than 0.1 nm, the OHx spectrum detection precision and the system environment adaptability are obviously improved, and the method is suitable for long-term stable operation at an extreme temperature (-40 DEG C to 50 DEG C).

The utility model discloses a micro-channel water cooling module for a four-pass slab laser amplification system, relates to the technical field of laser heat dissipation, and solves the problems that in the prior art, temperature measurement is inaccurate, and the interior of a liquid cooling structure is closed and cannot be overhauled. The device comprises a base body, two micro-channel heat dissipation blocks are detachably arranged on the base body in parallel, a gap between the two micro-channel heat dissipation blocks is used for arranging a lath laser crystal, a temperature detection unit used for being matched with the lath laser crystal is arranged on the base body, and a shading structure used for being matched with the temperature detection unit is arranged on the base body. Heat sink liquid inlet and outlet blocks are detachably arranged on the outer sides of the micro-channel heat dissipation blocks, liquid inlet and outlet structures are arranged on the heat sink liquid inlet and outlet blocks, and the liquid inlet and outlet structures are connected with heat exchange structures arranged on the micro-channel heat dissipation blocks. The micro-channel heat dissipation blocks are arranged in parallel, and the shading structure is arranged in the gap between the micro-channel heat dissipation blocks, so that the temperature monitoring unit can be prevented from absorbing pump light, and the temperature measurement error is reduced; meanwhile, the components are detachably connected, so that disassembly and assembly are convenient.

The application discloses a kind of air-cooled type tunable single-frequency pulsed slab laser, belong to solid laser technical field.The method includes diode stack, pump shaping system, coupling cavity mirror, slab laser crystal, first mirror, film polarizer, wherein, the diode stack is as pump source;The pump shaping system is used to eliminate the slow axis direction non-uniformity of diode stack, and slab laser crystal is directly partially end-pumped based on coupling cavity mirror;The coupling cavity mirror, first mirror and film polarizer jointly constitute annular resonant cavity, and oscillation laser is repeatedly passed through slab laser crystal in the annular resonant cavity, and finally single-frequency pulsed laser is output via film polarizer.The application does not need continuous seed modulation or seed injection locking, and the system is simple and reliable, low in cost, and can be used as the large energy single-frequency pulsed laser source required by atmospheric detection.

This invention discloses an all-solid-state, tune-free slab laser based on orthogonal Porro prisms, belonging to the field of solid-state laser technology. A diode array is used as the pump source; a pump shaping system homogenizes and shapes the slow axis of the diode array; a coupling cavity mirror introduces the shaped light field into the slab laser crystal and also functions as an oscillating laser reflector; the prisms of the first and second Porro prisms are orthogonal; the light field introduced into the slab laser crystal reaches the first Porro prism via a polarizer, is reflected, and then enters the coupling cavity mirror via the polarizer. It oscillates multiple times back and forth between the end face of the coupling cavity mirror and the end faces of the longitudinally arranged first and second reflectors, reaching the second Porro prism, and then returning along the same path to the first Porro prism, where it is output by the polarizer. This invention can output large single-pulse energy based on a single resonant cavity, eliminating the need for cascaded amplification, resulting in a highly compact system with high photoelectric conversion efficiency.

The invention relates to the technical field of solid laser, in particular to an end pump multi-pass slab laser amplifier which comprises a pump semiconductor laser, a laser shaping light path, a slab laser crystal, a laser reflection light path and a heat dissipation module. The heat dissipation module comprises a first temperature sensor, two heat dissipation assemblies, an oscillation assembly and a gas cooling circulation device, each heat dissipation assembly comprises a heat dissipation body and a lead-in device, and the two heat dissipation bodies are attached to the lath laser crystal; each stage of the leading-in device is divided into two parts and is branched to the nth stage step by step; the oscillation assembly comprises an electromagnetic coil and a magnet which are respectively arranged on the periphery and inside the fork part of the importer; when the electromagnetic coils drive the magnets to oscillate, the oscillation directions of the adjacent magnets are opposite; according to the invention, uniform cooling is ensured through the plurality of air inlets of the heat dissipation body; and in combination with the oscillation assemblies with opposite oscillation directions, unsmooth gas flow caused by excessive forks is avoided, and non-uniform distribution of the gas in binary distribution due to viscidity is also avoided.

An external optical injection-locked laser including a master laser (1), an input / output waveguide (3), and a slave laser (2) formed on the same substrate (9), in which the master laser (1) is configured to emit laser light to the input / output waveguide (3), the input / output waveguide (3) is configured to inject the laser light emitted from the master laser (1) into the slave laser (2) by a directional coupling method and output the laser light emitted from the master laser (1) and the slave laser (2), the slave laser (2) has a waveguide resonant cavity, the slave laser (2) is configured to emit laser light after making the laser light generated by the slave laser (2) coherent with the laser light injected from the master laser (1), and the laser light emitted from the slave laser (2) is synchronized by the master laser (1).

The invention provides a high-beam-quality slab laser system based on stimulated Brillouin scattering, which is used for solving the technical problem that pulse laser output with high pulse energy, high repetition frequency and high beam quality is difficult to simultaneously appear in the prior art. The device comprises a seed light beam shaping module, a double-end pumping slab amplification module and a phase conjugation module which are arranged in sequence, single-longitudinal-mode seed laser output by the seed light beam shaping module is guided into the double-end pumping slab amplification module to be subjected to double-pass amplification, and the amplified laser enters the phase conjugation module; and after returning through the phase conjugation module, the laser enters the double-end pumping slab amplification module again to be subjected to four-pass amplification, and then KHz nanosecond high-beam-quality laser is output. The laser is amplified for four times back and forth between the phase conjugation module and the double-end pumping slab amplification module, and nanosecond pulse laser output with high repetition frequency, large energy and high beam quality is achieved.

The application provides a soldering method of a slab laser gain medium module, which comprises the following steps: pre-treating relevant materials; setting a first diamond soldering transition sheet on one side of a first heat sink and performing soldering treatment to form a first soldering body; setting a second diamond soldering transition sheet on one side of a second heat sink and performing soldering treatment to form a second soldering body; setting a slab laser gain medium between one side of the first soldering body close to the first diamond soldering transition sheet and one side of the second soldering body close to the second diamond soldering transition sheet and performing soldering treatment. The application adds a diamond transition sheet with good heat conductivity between the slab laser gain medium and the soldering layer of the heat sink by adopting a cold pressure soldering pre-treatment method, improves the heat dissipation of the laser gain medium during work, reduces the thermal stress of the soldering layer of the laser gain medium and the heat sink, and improves the beam quality and reliability of the slab laser gain medium module.

The invention discloses a slab laser, which comprises a laser medium arranged in a slab shape; the pumping source is arranged on at least one end surface, side surface or large surface of the laser medium; the resonant cavity comprises a first lens, a second lens and a third lens, the first lens and the second lens are arranged on the two sides of the end face of the laser medium respectively, the third lens is arranged between the laser medium and the second lens, the first lens and the second lens form an optical resonant cavity, and the focal points of the first lens and the second lens coincide. The focal length f1 of the first lens and the focal length f2 of the second lens meet the following condition: # imgabs0 #; the third lens is used as a diaphragm inside the resonant cavity and reflects laser to the outside of the resonant cavity; and the Q switch is arranged between the third lens and the second lens. According to the invention, the lath-shaped laser medium is adopted as the oscillator, and the cavity type structure characteristics of the unstable cavity and the application of the third lens are combined, so that the size limitation of a Q switch is broken through, the laser output of the high-power Q-switched lath laser is obtained, and the power upper limit of the existing Q-switched laser is improved.

The invention discloses a surface gain slab laser medium preparation method based on reverse stress engineering, and relates to the technical field of solid laser manufacturing. Through a reverse strategy of doping a seed crystal long pure layer, protective pressure stress is introduced into a growth layer, crack initiation is successfully inhibited, and a composite crystal blank is obtained; cutting the blank along the center of the seed crystal layer to obtain two semi-finished products; after the pure YAG growth face of the semi-finished product is polished, the two pure YAG faces are in butt joint through the homogeneous thermal diffusion bonding technology, and the Yb: YAG / YAG / Yb: YAG sandwich structure batten is manufactured. According to the invention, crystal growth cracks are effectively inhibited, reliable interface bonding is realized, and color center and impure phase defects are eliminated.

The invention provides a multi-pass reflection plate strip laser oscillation device, which relates to the technical field of solid laser, and comprises a pumping source, a first cavity mirror, a second cavity mirror, a first reflection mirror, a second reflection mirror and a laser material, a first reflecting mirror and a second reflecting mirror are respectively arranged on two sides of the laser material; the first cavity mirror and the first reflecting mirror are located on the same side of the laser material, and the second cavity mirror and the second reflecting mirror are located on the same side of the laser material. According to the technical scheme provided by the invention, laser oscillation is realized through multi-pass reflection, and compared with the problems of large light spot aperture, high temperature gradient and poor light beam quality in the width direction in the traditional scheme, the structure uses a smaller light spot aperture to resonate in the cavity, so that the temperature gradient in the area where the light spot is located in the resonance process is small, and the light beam quality is improved. Degradation of light beam quality is greatly reduced, the light beam quality can be obviously improved, pulse output can be achieved by using a small-caliber Q switch in combination with an unstable cavity structure, and amplification or frequency conversion can be continued subsequently.