119 results about "Solid-state laser" patented technology

The embodiment of the invention discloses a solid laser with adjustable pulse width. According to one specific implementation mode, the solid laser comprises a shell, a pumping source, a gain medium, a controller, a pulse width regulation and control assembly, a first cavity mirror, a second cavity mirror, a Q-switching unit and a monitoring feedback device are arranged in the shell, and the pumping source is installed in front of the first cavity mirror; the gain medium is mounted behind the first cavity mirror, and the pumping source is configured to emit pumping light to the gain medium; the gain medium, the Q-switching unit and the second cavity mirror are sequentially arranged from front to back; the pulse width regulation and control assembly is installed in a resonant cavity of the laser. The monitoring feedback device is installed at the output end of the solid laser and used for detecting the actual pulse width and feeding back the actual pulse width to the controller. The controller is in communication connection with the monitoring feedback device and the pulse width regulation and control assembly. According to the embodiment, the actual pulse width of the output laser can be detected in real time, and the pulse width of the output laser can be adjusted. Therefore, the working accuracy of the laser can be improved.

The utility model relates to the technical field of laser devices, and discloses a laser assembly and a solid laser thereof, and the laser assembly comprises a liquid cooling heat dissipation block which is provided with an installation cavity arranged along the axial direction in a through manner, and is used for introducing a cooling medium; the number of the laser array modules is at least two, each laser array module comprises a strip-shaped heat conduction block and a plurality of bar units arranged in an arrayed mode, the bar units on each heat conduction block are connected in series, the heat conduction blocks are all arranged on the inner wall of the installation cavity and arranged in the circumferential direction, and the heat conduction blocks are used for conducting heat of the bar units to the liquid cooling heat dissipation block; and the heat is taken away by a cooling medium introduced into the liquid cooling heat dissipation block. By means of the mode, on the premise that it is guaranteed that the laser has high power and heat dissipation efficiency, it is guaranteed that no liquid leakage problem occurs after long-term use, the strip-shaped heat conduction blocks and the multiple strip units arranged in the extending direction of the heat conduction blocks can be replaced, and the maintenance cost of the laser is reduced.

The invention relates to a high-power dual-wavelength erbium-doped solid laser, and belongs to the technical field of laser. The high-power dual-wavelength erbium-doped solid laser comprises a pumping source, a pumping cavity, a diamond, a heat sink, a first resonant cavity and a second resonant cavity, the first resonant cavity comprises a first erbium-doped YAG slice crystal, and the second resonant cavity comprises a second erbium-doped YAG slice crystal. The first erbium-doped YAG sheet crystal is used for generating 1.64 [mu] m laser which oscillates back and forth in a back-and-forth light path provided by the first resonant cavity; and the second erbium-doped YAG sheet crystal is used for generating 2.94 [mu] m laser which oscillates back and forth in a back-and-forth light path provided by the second resonant cavity. According to the high-power dual-wavelength erbium-doped solid laser provided by the invention, synchronous output of 1.64 mu m and 2.94 mu m dual-wavelength laser is realized, the multifunctionality and medical adaptability of the laser are enhanced, and multi-type treatment requirements of soft tissues and hard tissues can be met at the same time.

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 invention provides a high-speed and multi-dimensional spatial light field regulation and control device, which can realize high-speed regulation of multiple dimensions such as amplitude, phase, polarization and the like of a spatial light field. Comprising a pumping regulation and control system, a collimation focusing shaping system and a laser resonance system which are sequentially installed through a three-dimensional adjusting frame along a light path, and the three systems are located on the same horizontal optical axis and are vertically arranged. The pumping regulation and control system comprises a signal generator, a driving circuit and a pumping source; the collimating focusing shaping system comprises a collimating lens, a conical lens or a cylindrical lens and a focusing lens, the laser resonance system comprises a laser crystal and a laser resonant cavity, and the laser resonant cavity comprises a compact parallel plane cavity and an open type optical resonant cavity. Laser pulses with different amplitude characteristics can be output at different moments; laser pulses with different phase characteristics can be output at different moments; and laser pulses with different polarization characteristics can be output at different moments.

The invention discloses a generation system and method based on a vector light beam of any structure, and the system comprises a laser, a collimating and beam expanding element, a polarizing film, a first half-wave plate, a beam splitting cube, a polarization beam splitting cube, a reflector, a second half-wave plate, a quarter-wave plate, a Fourier lens, a spatial light modulator, a computer, and a camera. Two parallel light beams which are generated by a continuous wave solid laser and a half-wave plate and have an orthogonal polarization state are respectively irradiated on spatial light modulators which are loaded with different topological charge values and are used for customizing light beam holograms with any shapes and structures, are modulated by the spatial light modulators, and are coaxially superposed with a Fourier lens through a quarter-wave plate; and the customized vector light beam with any shape and uniform intensity can be generated. According to the invention, the direct mapping of a real object can be realized, the light beam quality is improved, and the polarization state is flexibly regulated and controlled.

The invention discloses a 1319nm laser based on a torsional mode cavity and a lath configuration, which belongs to the technical field of solid lasers and comprises an oscillator stage, a pre-amplifier, a first-stage main amplifier and a second-stage main amplifier which are sequentially arranged, the oscillator stage generates a [mu] J magnitude narrow linewidth pulse laser and outputs the [mu] J magnitude narrow linewidth pulse laser to the pre-amplifier, the pre-amplifier amplifies the incident narrow linewidth pulse laser to an mJ magnitude and outputs the laser to the first-stage main amplifier, the first-stage main amplifier amplifies the incident narrow linewidth pulse laser to a dozens of mJ magnitude, and the second-stage main amplifier outputs the amplified laser to the second-stage main amplifier. The second-stage main amplifier amplifies the incident narrow-linewidth pulse laser to a magnitude of hundreds of mJ, and outputs the narrow-linewidth pulse laser to the second-stage main amplifier. The system outputs narrow-linewidth pulse laser with excellent light beam quality, and can be widely applied to the field of laser radar detection.

In an LD-pumped solid-state laser, where a solid-state laser crystal is excited by excitation light emitted from an LD to cause laser oscillation, and the resulting laser oscillation light of two frequencies is converted into a sum frequency, stable operation and cost reduction are achieved. [Solution] In an LD-pumped solid laser 1 comprising a solid laser crystal 19, an LD 11 that emits excitation light to excite the solid laser crystal 19, a resonator that resonates the light emitted from the solid laser crystal 19, and an optical wavelength conversion element 22 that converts the wavelength of solid laser oscillation light L21 and L22, a multiplexing means 21 is provided that receives the two solid laser oscillation light L21 and L22 from different directions and combines them into one, and the optical wavelength conversion element 22 converts the combined solid laser oscillation light L21 and L22 into a sum frequency.

The invention relates to the technical field of laser devices, and discloses a multi-bar series connection assembly and a pumping solid laser, the multi-bar series connection assembly comprises a plurality of bar modules which are arranged, two adjacent bar modules are arranged at intervals, and a bent and deformable metal foil is connected between two adjacent bar modules. And the two adjacent bar modules realize positive and negative electrode conduction through the metal foil connected between the two bar modules. By means of the mode, thermal stress in the multi-bar series connection assembly can be effectively released, the problem of laser bar cracking caused by hard connection adopted by a traditional structure is solved, the structural reliability and stability of the multi-bar series connection assembly are improved, and the service life of the multi-bar series connection assembly is prolonged.

The utility model provides a solid laser crystal heat sink structure, which relates to the field of laser crystal heat dissipation and comprises a first shell and a second shell combined with the first shell to form an accommodating space, a TEC semiconductor cooler and a pipeline are arranged in the accommodating space, a gap is reserved between the pipeline and the TEC semiconductor cooler, and the gap is filled with heat-conducting silica gel. The device further comprises a third shell arranged in the TEC semiconductor refrigerator, a laser crystal is arranged in the third shell, the laser crystal and the third shell form an interlayer, and an indium layer is arranged in the interlayer. According to the utility model, the TEC semiconductor cooler can accurately control the temperature of each part of the laser crystal, so that the heat dissipation capability of each part is matched with the heat distribution of the laser crystal.

The invention relates to the technical field of solid lasers, and particularly provides a narrow-linewidth tunable dual-wavelength laser output system based on data driving, which comprises a pumping source, a resonant cavity, a data acquisition unit and a data receiving and driving device, a single gain medium, two F-P etalon and an F-P angle regulator are arranged in the resonant cavity, the inclination angles of the two F-P etalon are adjusted through an F-P angle adjuster so as to perform longitudinal mode selection and wavelength tuning on the output laser of the resonant cavity; a neural network screening model is arranged in the data receiving and driving device, the neural network screening model is used for learning the mapping relation between intracavity parameters and output laser optical parameters, and dual-wavelength simultaneous locking and line width prediction are achieved through dual-etalon collaborative mode selection and data driving of the neural network screening model. According to the invention, the complexity of the system is greatly simplified, and dual-wavelength, narrow-linewidth, high-stability, repeatable and automatic laser output regulation and control which cannot be achieved by a traditional architecture are realized functionally.

The utility model relates to the technical field of laser equipment, in particular to a laser assembly, a solid-state laser and laser processing equipment, and the laser assembly comprises a birefringent crystal which is used for emitting solid-state laser under the pumping effect, and the solid-state laser comprises two pieces of orthogonal polarized light with different wavelengths; the Q switch is arranged at one end of the birefringent crystal and is used for controlling the output of the solid-state laser; and the dual-wavelength output coupler is arranged at one end, deviating from the birefringent crystal, of the Q switch and is used for coupling and outputting two orthogonal polarized lights in the solid-state laser. Through the mode, the energy loss in the laser pumping cavity can be reduced, so that the laser threshold value is reduced, and the laser output power is improved.

The invention discloses a laser batten welding device and method, and belongs to the technical field of solid lasers. The laser batten welding device comprises a fixing frame, the fixing frame comprises a bottom plate and side vertical plates, a laser batten assembly is arranged on the fixing frame, a first heating block is arranged at the top of the laser batten assembly, a second heating block is arranged between the laser batten assembly and the bottom plate, the top of the first heating block abuts against a first pressing block, and the top of the second heating block abuts against a second pressing block. The side face of the laser batten assembly abuts against a second pressing block, and the first pressing block and the second pressing block abut against the bottom plate and the side vertical plate of the fixing frame through two spring limiting devices arranged on the side vertical plate and the bottom plate respectively. The laser batten welding device is simple in structure, easy and convenient to operate and capable of achieving rapid and high-quality welding of laser battens.

The invention discloses a system and a method for lossless dynamic measurement of microstructure characteristics of a material surface, and relates to the technical field of optical measurement, and the method comprises the following steps: S1, placing an object to be measured on a two-dimensional stepping motor platform, and adjusting the platform to be horizontal; and starting the solid laser. According to the invention, an optical system composed of a solid laser, a beam expander, an aperture diaphragm and a spectroscope generates an accurate detection light beam, a spatial filter designed according to a confocal diffraction limit is matched to effectively suppress defocus stray light interference, and a multi-parameter fusion judgment mechanism is combined to synchronously extract a light intensity peak value and a light spot centroid offset, so that the detection accuracy is improved. The focus is judged only when the light intensity reaches the maximum value and the mass center offset is smaller than the threshold value, the positioning precision is greatly improved, Z-axis coordinate errors are dynamically corrected through real-time vibration compensation and thermal drift compensation, the problems of sample damage and optical method noise interference in traditional contact measurement are solved, and undistorted data support is provided for microstructure three-dimensional reconstruction.

The invention discloses a temperature-driven tunable all-solid-state 1.5-micron cross-polarization dual-wavelength laser, and belongs to the technical field of solid lasers. The laser comprises a laser pumping source, a light beam shaping device and a laser resonant cavity which are sequentially arranged along a light path, a cooling device is mounted outside the laser resonant cavity; the laser resonant cavity comprises a laser crystal arranged on a light path; laser emitted by the laser pumping source passes through the light beam shaping device and then is focused and incident into the laser crystal, and the laser crystal is selected from one of an a-cut Er < 3 + > / Yb < 3 + > double-doped borate crystal, an Er < 3 + > / Yb < 3 + > double-doped vanadate crystal and an Er < 3 + > / Yb < 3 + > double-doped yttrium aluminum garnet crystal. The all-solid-state 1.5-micron cross-polarization dual-wavelength laser with tunable power is realized by utilizing the photo-thermal anisotropy of the a-cut Er < 3 + > / Yb < 3 + > double-doped 1.5-micron laser crystal and adjusting the crystal temperature through the cooling device.

The application discloses a kind of hollow light beam coherent array solid-state lasers, it is related to the technical field of laser, wherein, microstructure sheet and microstructure output layer adopt bonding mode connection;Array of hollow light field modulation structure is formed on microstructure sheet, pump source is used to emit pumping light, pump source and optical coupling system are relatively microstructure sheet and are matched to be set, so that pumping light can be coupled into microstructure sheet by optical coupling system, and hollow light beam array is formed by hollow light field modulation structure array;Hollow light beam array enters microstructure output layer by microstructure sheet, and forms coherent coupling and injection phase-locked in microstructure output layer, and outputs hollow light beam coherent array laser.Through the technical scheme of the application, high-power hollow light beam coherent array laser output can be obtained, and hollow light beam regulation is easy to realize, the scope of application is wide, and scalability is strong, and simple structure, low in cost, high in efficiency.

The invention discloses a solid-state laser of a spectrum beam combination semiconductor laser pump. The solid-state laser comprises a spectrum beam combination pumping source system, a pumping coupling system and a solid-state laser resonant cavity, pump light emitted by the spectrum beam combination pump source system is collimated and focused through the pump coupling system and then enters a gain medium of the solid laser resonant cavity, generated oscillation light of a first wavelength oscillates in the solid laser resonant cavity in a reciprocating mode, and laser output of a second wavelength is achieved. High-power pumping can be carried out on the gain medium under the condition that the quality of pumping laser beams is not reduced, the problem that the quality of the beams is poor in traditional semiconductor laser direct pumping is solved, and a research basis is provided for follow-up power improvement.

This invention provides an intelligent adjustment device and method for an Er-doped solid-state laser, comprising a four-mirror cavity laser resonator consisting of a pump source, a collimating mirror, a focusing mirror, an input end mirror, an Er-doped laser crystal, an end mirror, an output coupling mirror, and a high-reflectivity mirror; and an automatic control system consisting of a PC information processing module, a visible light probe detection module, a feedback control module including a cavity mirror control rail and an angle controller, and an infrared optical power meter. The visible light probe detects the intensity change of the upconversion light from the Er-doped laser crystal in real time, which is verified by the infrared optical power meter. The PC module controls the feedback module to adjust the cavity mirror distance and angle to achieve closed-loop control. This invention utilizes optical characteristics to replace detection and intelligent closed-loop control, solving the problems of high cost and slow response of traditional 3-micron lasers, achieving low-cost, high-response automated cavity mirror control, and possessing advantages such as cost savings, fast response, and strong fault tolerance.

The invention relates to the technical field of solid-state lasers, in particular to a side pumping device for a solid-state laser and the solid-state laser. A side pumping device for a solid-state laser includes: a laser crystal rod; the pump radiation sources are arranged on the side wall of the laser crystal rod at intervals, and the pump radiation sources are configured to provide pump light; the optical substrate is arranged between the laser crystal rod and the pumping radiation source; the optical substrate comprises a first surface and a second surface, the first surface is arranged corresponding to the pumping radiation source, and the second surface is arranged corresponding to the laser crystal bar; the first surface is provided with a first metasurface structure, and the second surface is provided with a second metasurface structure; the first metasurface structure is configured to enable the pump light to be vertically incident into the optical substrate; the end, away from the optical substrate, of the second metasurface structure abuts against the laser crystal rod and is configured to change the deflection angle of the pump light to a target deflection angle. The target deflection angle is larger than a total internal reflection critical angle of the laser crystal rod and an external environment interface.

The utility model provides a chromium-doped gain medium solid laser based on thulium solid laser pumping. Comprising a pumping source, a pumping light coupling device, a first laser lens, a thulium-doped laser gain medium, a first laser coupling output lens, a light coupling device, a second laser lens, a chromium-doped laser gain medium and a second laser coupling output lens which are arranged in sequence, the thulium-doped laser gain medium is a thulium-doped solid gain medium; the chromium-doped laser gain medium is a chromium-doped solid gain medium; a first oscillation cavity of laser is constructed between the first laser lens and the first laser coupling output lens; and a second oscillation cavity of the laser is constructed between the second laser lens and the second laser coupling output lens, and is used for wavelength selection to realize the output of the laser at the wave band of 1.9-3 microns. According to the utility model, the thulium-doped solid laser is used as a pumping source for pumping the chromium-doped crystal, so that the problem that the chromium-doped crystal is low in pumping efficiency and output power under other pumping sources such as an optical fiber laser is solved.

The utility model discloses a novel watt-level solid laser core, which relates to the field of watt-level solid laser cores and comprises a yttrium aluminum garnet doped crystal and a yttrium aluminum garnet crystal which are connected with each other. The number of the doped yttrium aluminum garnet crystal and the yttrium aluminum garnet crystal is one or more; according to the novel watt-level solid laser core, the cost can be greatly saved through a microchip cutting process, the requirement that the light spot diameter is matched with the separation cavity is met by adjusting the cavity length of the core cavity, watt-level pumping power is achieved, and miniaturization is easy.

The utility model relates to a solid state laser radar system, which comprises a shell and a rear cover, the rear cover is connected with the shell, a first all-solid-state laser radar module and a second all-solid-state laser radar module are installed in the shell, the first laser radar module is located at the upper part of the interior of the shell, and the second laser radar module is located at the lower part of the interior of the shell. The second laser radar module is located at the lower part in the shell, the first laser radar module is provided with a first medium-distance lens and a first long-distance lens, and the second laser radar module is provided with a second medium-distance lens and a second long-distance lens; field angles formed by the first medium-distance lens and the first long-distance lens are subjected to point cloud splicing mutually, and field angles formed by the second medium-distance lens and the second long-distance lens are subjected to point cloud splicing mutually. The utility model has the beneficial effects of high reliability, long measurable distance and wide field angle range.

The application belongs to the technical field of laser heat dissipation, and particularly relates to a hierarchical heat dissipation device for a solid laser crystal rod and a control method thereof. The device comprises a TEC adjustable heat dissipation clamp and a split heat dissipation clamp. A TEC heat dissipation module and a first cooling liquid channel are arranged in the body of the TEC adjustable heat dissipation clamp. The cold face of the TEC heat dissipation module is arranged close to the end of the crystal rod pump source. The hot face of the TEC heat dissipation module is cooled by the cooling liquid in the first cooling liquid channel. The split heat dissipation clamp comprises a heat-conducting top block and an intermediate body. The bottom of the heat-conducting top block is detachably connected to the top of the intermediate body. The heat-conducting top block is provided with a second L-shaped clamping surface for placing the other end of the crystal rod. The heat-conducting top block is cooled by the cooling liquid in the second cooling liquid channel arranged in the intermediate body. The application integrates two heat dissipation mechanisms, has the advantages of high-precision temperature control and high-reliability structure, and solves the problems of insufficient heat dissipation at the hot end and supercooling condensation at the cold end.

The invention relates to the technical field of optical fiber solid lasers, and discloses a red and green light composite laser suitable for multifunctional 3D printing. The laser is integrated with a semiconductor / optical fiber pump light source, a nonlinear frequency conversion device comprising an infrared focus lens and a non-critical phase matching crystal, a light beam separation and synthesis device with a collimating lens and a wave plate motor driving half-wave plate, a pump light garbage can, a temperature control device, an integrated control unit and a double-core / multi-core transmission optical fiber. Through temperature control and frequency stabilization, polarization beam combination, residual light absorption and multi-parameter cooperative regulation and control, and by matching with a multi-material adaptation algorithm, coaxial composite output of red light and green light is realized. The defects that traditional single-wavelength laser is difficult to adapt to multiple materials, an existing composite scheme is inflexible in power adjustment, low in coaxiality and the like are overcome, the machining mode is dynamically adjusted for high-reflectivity and conventional materials, multi-material, high-precision and high-efficiency additive manufacturing is achieved, and the method is suitable for the fields of aerospace, electronic devices and the like.

The application belongs to the field of high-power solid-state lasers, and particularly relates to a linkage locking sheet-shaped amplifier sealing bottom plate structure convenient to disassemble and assemble. The structure comprises a bottom plate, a driving sliding block mechanism, a pi-shaped sliding frame, a sliding linkage mechanism and a positioning locking mechanism. Through linear movement of the driving sliding block mechanism, the pi-shaped sliding frame is driven to slide, and the locking rods of multiple positioning locking mechanisms are synchronously controlled through the sliding linkage mechanism, so that quick locking and unlocking operations of the sealing bottom plate are realized. The pre-tightening spring in the positioning locking mechanism provides automatic tension, ensuring firm locking effect. The linkage locking mechanism is used to replace the screw fixing mode in the prior art, and only simple sliding operation is needed to quickly complete installation and disassembly of the sealing bottom plate, greatly simplifying the operation process, reducing the maintenance difficulty and effectively improving the work efficiency.

This invention discloses a 1319nm laser based on a torsional cavity and slat configuration, belonging to the field of solid-state laser technology. It includes an oscillator stage, a preamplifier, a first-stage main amplifier, and a second-stage main amplifier placed sequentially. The oscillator stage generates a narrow-linewidth pulsed laser in the μJ range and outputs it to the preamplifier. The preamplifier amplifies the incident narrow-linewidth pulsed laser to the mJ range and outputs it to the first-stage main amplifier. The first-stage main amplifier amplifies the incident narrow-linewidth pulsed laser to the tens of mJ range and outputs it to the second-stage main amplifier. The second-stage main amplifier amplifies the incident narrow-linewidth pulsed laser to the hundreds of mJ range. This invention provides a narrow-linewidth pulsed laser with excellent beam quality, which can be widely used in the field of lidar detection.

The embodiment of the invention provides a solid laser, which comprises a gain resonant cavity and a loss resonant cavity connected with the gain resonant cavity, the gain resonant cavity comprises a first cavity and a gain medium assembly arranged in the first cavity, and is used for reflecting light of the gain resonant cavity back and forth in the cavity to prolong the working length of the gain medium assembly, inhibiting spontaneous radiation of photons and improving the photon number density in the cavity; wherein the gain medium assembly is used for providing optical gain; and the loss resonant cavity comprises a second cavity and a lens system arranged in the second cavity, and is used for reducing the diffraction loss of the auxiliary resonant cavity. According to the solid laser, the composite degenerate cavity structure design is adopted, the main body gain resonant cavity and the auxiliary loss resonant cavity are separated, and the quality of output light beams is improved.

The invention relates to the technical field of solid lasers, in particular to a pumping device and a solid laser. The pumping device comprises a laser crystal; the flow guide tube is a hollow cylindrical tube, and the laser crystal is arranged in the flow guide tube; the metasurface lens group is arranged on the outer side wall of the flow guide pipe; the output end of the laser diode array is arranged corresponding to the metasurface lens group; wherein the metasurface lens group is configured to collimate the divergence angle of the output light of the laser diode array. Therefore, the collimation of the output light of the laser diode array can be realized through the metasurface lens group arranged on the flow guide tube, so that the output light can enter the flow guide tube at a vertical angle and then enter the laser crystal, and the pumping of the laser crystal is realized. After being collimated by the metasurface lens group, light emitted by the laser diode is converted into parallel light which is uniformly distributed, so that uniform pumping of the gain medium is realized, and the influence of local heat accumulation on the quality of an emergent light beam is effectively avoided.

The utility model relates to the technical field of laser testing equipment, and discloses a lath crystal side pump uniformity testing device, which comprises a seed light source, a small hole diaphragm, an Nd: YAG lath crystal, a focus lens, a 45-degree reflection attenuation sheet and a light beam analyzer which are sequentially arranged along the direction of a light path, an LD pumping module is arranged above the Nd: YAG lath crystal, and the light beam analyzer is arranged above the Nd: YAG lath crystal. A crystal heat sink is arranged below the Nd: YAG lath crystal, and the crystal heat sink is connected with the bottom of the Nd: YAG lath crystal; the device provided by the utility model is suitable for the uniformity test of the whole lath crystal in a large-mode-volume unstable-cavity solid laser, and the reliability and stability of the uniformity test are effectively improved.