377results about "Laser cooling arrangements" patented technology

The invention relates to the technical field of lasers, in particular to a laser heat management device and a control method thereof, the laser heat management device comprises a cooling substrate, the cooling substrate is internally provided with a micro-channel, the micro-channel comprises a main channel and a branch channel, and the main channel is used for circulating cooling water; the cooling substrate is provided with a detection control area, the detection control area is located at the joint of the branch channel and the main channel, the detection control area is provided with a phase change micro-valve and a detection assembly, the detection assembly is used for collecting temperature data, the phase change micro-valve comprises a phase change material and a flexible separation blade, and after the valve is opened, the phase change material generating phase change pushes the flexible separation blade, and the phase change micro-valve is connected with the detection assembly. The communication state of the main channel and the branch channel is controlled; the main controller is used for receiving the temperature data of all the detection control areas and controlling the valves of the corresponding detection control areas to be opened or closed according to the deviation between the temperature data and the target temperature. The temperature gradient of the laser can be reduced at least so as to ensure that the laser realizes a long-term stable working state.

The utility model discloses a laser with an expandable pumping source and portable laser processing equipment, and belongs to the technical field of lasers. Comprising at least one pumping source module, and the pumping source module comprises at least one pumping source body and a heat dissipation assembly; the heat dissipation assembly comprises a heat dissipation device and a heat dissipation base, the heat dissipation base is connected to one side, in the first direction, of the heat dissipation device, and the pumping source body is detachably arranged on the other side, in the first direction, of the heat dissipation base; according to the laser with the expandable pumping source, a corresponding number of pumping source modules can be matched according to the requirements of the laser with the expandable pumping source, so that the pumping source expansion of the laser is realized, and the corresponding pumping source body is cooled through the cooling assembly in the corresponding pumping source module, so that the cooling effect of the laser with the expandable pumping source is ensured, and the service life of the laser is prolonged. Meanwhile, due to the modular arrangement of the pumping source and the heat dissipation assembly, the reusability and adaptability of the pumping source module are improved, and the design and manufacturing cost is reduced.

The invention relates to the technical field of high-power femtosecond laser manufacturing, and discloses a high-power industrial femtosecond laser water cooling structure and a thermal stability optimization method thereof. Comprising the steps that an adjustable flow resistance valve driven by a shape memory alloy is arranged in a cooling water channel in a machine shell water cooling plate, and a temperature sensor is embedded in a key position of the machine shell water cooling plate; a paraffin-based or metal-based phase change material is filled at the bottom of the heat dissipation chute of the shell water cooling plate; an ultrathin uniform-temperature plate is embedded in the water-cooling plate of the casing, so that heat of local hot spots, such as heat near a reflecting mirror seat, on the water-cooling plate of the casing is quickly diffused to the whole water-cooling plate; bionic guide vanes are arranged in the cooling water channel; an aerogel heat insulation layer is additionally arranged between the machine shell water cooling plate and the outer shell, the machine shell water cooling plate and the outer shell are connected through a titanium alloy connecting piece with a low expansion coefficient, and a flow channel cover plate and the machine shell water cooling plate are flexibly connected through a metal corrugated pipe.

The invention relates to the technical field of high-power femtosecond laser manufacturing, and discloses a high-power industrial femtosecond laser water cooling structure and a manufacturing method thereof. Comprising the steps that any one of a variable cross-section spiral flow channel, a bionic fin flow channel or a micro-channel array is directly machined in a machine shell water-cooling plate through the five-axis linkage precision machining technology or the micro-nano machining technology, or the printer shell water-cooling plate is integrated through the metal additive manufacturing technology; a reflector base, a heat dissipation chute and a cooling water channel are integrated in the machining process of the water cooling plate of the machine shell; carrying out material and surface treatment process operation; assembling process operation is carried out, a reflecting mirror base is matched with a mortise and tenon joint structure and a machine shell water-cooling plate through high-precision positioning pins, the reflecting mirror base and the machine shell water-cooling plate are rigidly connected in a vacuum brazing or laser welding mode, and a light guide side plate and a runner cover plate are designed into standard modules; the light guide side plate and the runner cover plate are quickly assembled through magnetic attraction positioning and spring buckles.

A portable air-cooled fiber laser device disclosed by the present invention comprises a box body, a laser pumping source, a fiber output assembly, a power supply assembly, a heat dissipation engine and a control circuit are integrated in the box body, the power supply assembly adopts a drawable structure, a replaceable battery is arranged in the power supply assembly, and energy supply without an external power supply is realized. The heat dissipation engine is arranged in a sandwich type structure and is composed of a heat dissipation fin set and heat pipes embedded in the heat dissipation fin set, a transverse ventilation heat dissipation channel is formed through a heat dissipation fan, and efficient heat management is achieved. Connection with a mobile terminal or computer equipment in a wired or wireless mode is supported, and remote control over the operation state of the laser is achieved. The device is compact in structure, efficient in heat dissipation and convenient to carry, has good heat dissipation performance, independent power supply capacity and environmental adaptability, is suitable for application scenes such as multi-scene field operation and emergency use, and has good practicability and popularization value.

The invention discloses a laser heat dissipation system and method and an air-cooled fiber laser, and relates to the technical field of lasers, the disclosed laser heat dissipation system comprises a data acquisition module, a main control module, a fan driving module and a heat dissipation fan, the main control module is electrically connected with the data acquisition module and the fan driving module, and the fan driving module is electrically connected with the heat dissipation fan. The fan driving module is electrically connected with the cooling fan; the data acquisition module is used for acquiring the output power, the input current, the input voltage and the temperature value of the laser; the main control module is used for determining a reference fan control signal according to the output power and correcting the reference fan control signal according to the temperature value and / or an efficiency value calculated through the output power, the input voltage and the input current to obtain a target fan control signal; and the fan driving module is used for controlling the rotating speed of the cooling fan according to the target fan control signal. The heat dissipation efficiency of the laser heat dissipation system can be improved.

The invention provides a high-power wide-spectrum long-wave infrared femtosecond laser generation method, and relates to the technical field of infrared ultrafast laser. According to the method, the 1.5 [mu] m pumping BGSe crystal is adopted, compared with a traditional 1 [mu] m pumping BGSe crystal, the heat accumulation effect is greatly reduced, and the operation stability of the system is remarkably improved in combination with a water-cooling heat dissipation device. Through crystal cutting angle optimization and phase matching design, 10-16 [mu] m wide-spectrum long-wave infrared femtosecond laser output is achieved, the power reaches 100 mW, and the application requirements in the fields of molecular spectrum recognition, environment monitoring and the like are met.

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 utility model provides a heat radiation device used for a laser and a laser module comprising the heat radiation device, in one embodiment, the heat radiation device comprises a laser gain medium having a first surface and a second surface; the antireflection film is arranged on the first surface of the laser crystal; the reflecting film is arranged on the second surface of the laser crystal; and the heat sink is used for supporting and fixing the laser gain medium and absorbing heat generated by the laser gain medium, and the heat sink is made of single crystal silicon carbide. The heat dissipation device provided by the utility model is low in processing cost, and facilitates the popularization and application of the disc laser.

The invention relates to the field of microcavity photonics and the technical field of control, and provides a temperature locking method and device based on an optical microcavity absorption peak position, and the method comprises the steps: employing a tunable laser to output continuous light, and obtaining a transmission spectrum power curve; manually adjusting the output wavelength of the tunable laser, and recording the wavelength interval as a rough absorption peak position when a wave band with significantly reduced transmission spectrum power is detected; automatically adjusting the output wavelength of the tunable laser, and continuously scanning in the rough wavelength interval of the absorption peak position to obtain the absorption peak position; the offset between the position of the absorption peak and the position of a target absorption peak of the optical microcavity in a natural room temperature state is calculated, and the detected position of the absorption peak is stably maintained at the position of the target absorption peak by automatically heating or refrigerating the optical microcavity. Through the method, the problems of heat conduction path delay and thermal field gradient between the microcavity and the sensor are avoided, and the response speed and precision of wavelength drift compensation are improved.

A passively, Q-switched laser is described. The laser may operate at an eye-safe lasing wavelength of 1.34 microns and use a gain element of Nd:YVO4 and a saturable absorber element of V:YAG with a space separating the gain element and saturable absorber element. The Q-switched laser is pumped by a grating stabilized laser diode. The laser may be used in laser ranging applications.

The application discloses a step variable pressure type micro-channel heat dissipation structure and a high-power laser cut-off light screen, and the structure comprises a flow channel (3), a gradually widened micro-channel (4), a first step variable pressure structure (5) and a second step variable pressure structure (6). The first step variable pressure structure (5) and the second step variable pressure structure (6) comprise a plurality of step-by-step increased elliptical cylinder arrays, the number of the elliptical cylinders is step-by-step increased, the length of the short axis of the elliptical cylinder is step-by-step decreased, the fluid flow cross-sectional area is step-by-step decreased, and the flow speed is step-by-step increased to form a jet effect to accelerate the fluid, and finally the fluid enters the gradually widened micro-channel (4) at a higher flow speed to realize flow heat exchange. The step variable pressure structure with the step-by-step increased number of elliptical cylinders, the step-by-step decreased length of the short axis and the step-by-step decreased total flow cross-sectional area at the micro-channel inlet section can rapidly and gradiently increase the pressure to accelerate the fluid, and effectively solve the problems of excessive and concentrated pressure at the micro-channel inlet.

The invention discloses a temperature control method and device for a laser and a medium, and relates to the technical field of temperature control, and the method comprises the steps: obtaining the operation parameters of a pump source assembly in a laser system, and carrying out the data query and interpolation calculation through a predefined current heat mapping table based on the pump source current in the operation parameters, and generating a thermal load prediction value; based on the thermal load predicted value and according to the working mode of the laser, a refrigeration control signal is generated, and the refrigeration control signal is sent to an execution component of the refrigeration system so as to control at least one of the rotating speed of a compressor, the opening degree of an expansion valve and the rotating speed of a fan; and calculating a current fine tuning coefficient according to the difference between a target temperature value in the thermal load predicted value and an actual temperature value, performing overall current compensation according to the difference between a power set value in the thermal load predicted value and an actual power value, and outputting an independent current adjustment value and a total current adjustment value of each pump source assembly.

The invention discloses a water, electricity and light independent separation multi-cavity laser heating system and device. The system comprises a laser generating module, a light beam guiding module, a double-cavity isolation module and a variable light spot adjusting module. The laser generating module outputs a laser beam, the light beam guiding module enables the laser beam to be transmitted according to a preset path through light path steering, the double-cavity isolation module comprises a laser action cavity and a cooling medium cavity which are mutually independent, and the variable light spot adjusting module is integrated in the laser action cavity to adjust the dimension of a light spot. The device comprises a frame assembly, a laser emitting part, a reflecting part, a lens adjusting part and a cooling part, the laser emitting part outputs light beams, the light beams enter a laser cavity after being turned by the reflecting part, the lens adjusting part adjusts the light spot width, and the cooling part is communicated with a water path of a lens fixing seat through a water cooling pipe to achieve cooling. The laser action cavity and the cooling medium cavity are subjected to double-cavity separation, and the problems that when light spots are adjusted, a pipeline is prone to being pulled and large in size, and cooling is affected by laser radiation are solved.

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 invention relates to the technical field of heat dissipation, in particular to a heat dissipation device and method for a high-power-density device. The heat dissipation device comprises a heat dissipation bottom face, heat dissipation fins and a heat conduction layer. The heat dissipation fins and the heat conduction layer are connected to the two sides of the heat dissipation bottom face. The heat conduction layer is in contact with the high-power-density device, and the contact area of the heat conduction layer and the high-power-density device is smaller than the contact area of the heat conduction layer and the heat dissipation bottom face. By arranging the heat conduction layer, heat generated by the high-power-density device can be radiated in the direction perpendicular to the contact face of the heat dissipation device and the high-power-density device and can be conducted to the periphery of the high-power-density device along the heat conduction layer at the same time. Compared with a traditional radiating fin or radiator, the radiating fin or radiator has the advantages that the radiating effect is greatly enhanced, the heating power density upper limit of high-power devices such as a laser, an LED (light-emitting diode) and a TR assembly under the condition that the radiating fin or radiator is singly used is improved, and the use cost of the high-power density devices is reduced.

An apparatus includes a frame structure forming a circumference around an opening, a receptacle along the circumference, wherein the receptacle is configured to allow a secure placement of an optical element such that electromagnetic waves traveling from the opening impinge upon the optical element; N heating elements attached to the frame structure substantially along entirety of the circumference, where N is a positive integer; and a radiation reflector disposed along the circumference of the frame.

The invention provides a laser chamber, a gas laser apparatus, and a manufacturing method of an electronic device. A laser chamber according to one aspect of the present disclosure is a laser chamber of a gas laser device that outputs laser light, the laser chamber being provided with: a container filled with a laser gas; a first electrode extending in a first direction and disposed inside the container; a second electrode extending in the first direction and disposed at a position closer to the inner wall of the container than the first electrode in a state of facing the first electrode in a second direction perpendicular to the first direction; a fan that causes the laser gas to flow in a discharge space between the first electrode and the second electrode; a plurality of heat pipes disposed on the inner wall of the container; and a plurality of heat exchangers disposed in the container so as to be separated from each other.

The present application relates to the technical field of laser, and especially relates to a heat dissipation system and a laser device. The heat dissipation system is used for dissipating heat for a laser, and the heat dissipation system comprises a refrigeration mode and a standby mode. The heat dissipation system comprises a compressor, a condenser, a cold plate and a functional device. The cold plate is used for cooling the laser. The functional device is used for throttling when the heat dissipation system is in the refrigeration mode, and is used for throttling and heat exchanging when the heat dissipation system is in the standby mode. The compressor, the condenser, the functional device and the cold plate are sequentially and circularly connected, and form a circulating loop of refrigerant. The laser device comprises the heat dissipation system. The present application provides a heat dissipation system and a laser device, so as to at least alleviate the technical problems that the cooling part of the laser is large in size, the cooling part is prone to condensation and frost when the laser is not started, and the compressor is prone to liquid compression damage.

The invention discloses a side pumping structure adopting staggered arrangement of LDs, and belongs to the technical field of high-power all-solid-state lasers, the side pumping structure comprises a laser crystal rod, a pumping module and a cooling system, the pumping module is composed of a plurality of circles of LD bar strip arrays, the LD bar strip arrays tightly surround the outer side of the laser crystal rod, the LD bar strip arrays comprise a plurality of LD bar strips, and the LD bar strips are arranged on the outer side of the laser crystal rod. The cooling system is integrated outside the pumping module, a quartz tube is sleeved on the outer side of the laser crystal rod, a high-reflection film is arranged on the outer wall of the quartz tube, and cooling water is arranged between the laser crystal rod and the quartz tube. By the adoption of the structure, due to the staggered arrangement, pump light does not enter a few axial positions of the crystal rod in a concentrated mode any more, but is dispersed in the axial direction; in this way, the absorption length of the pump light by the crystal rod is effectively lengthened, local energy accumulation is avoided, and heat sources in the crystal rod are distributed more evenly and axially.

The invention relates to the technical field of ultrafast laser, and discloses a negative chirp management method and device of a laser and a medium. The method comprises the following steps: pre-processing a seed pulse, outputting the seed pulse through a mode-locked optical fiber oscillator, and primarily amplifying the seed pulse through a single-mode gain optical fiber; temperature tuning negative chirp introduction is carried out, a chirp fiber grating is packaged in a temperature tuning device, and the temperature of a semiconductor chilling plate is linearly increased within a preset range, so that the second-order dispersion amount of the chirp fiber grating is changed, and controllable negative chirp is introduced into a pulse; carrying out nonlinear amplification and spectrum broadening, inputting the pulse introduced with the negative chirp into a multimode gain fiber, injecting pumping energy into the multimode gain fiber, and broadening the pulse spectrum width to be greater than a preset width by utilizing the synergistic effect of self-phase modulation, dispersion and gain; pulse width compression is carried out, and the pulse after spectrum broadening is adjusted through a transmission-type grating pair compressor, so that the ultra-narrow pulse width is obtained.

The invention relates to the technical field of lasers, in particular to a multi-pass gain laser, which comprises a pumping source, a beam shaping mirror group, a first reflecting mirror, a second reflecting mirror and an output coupling mirror which are arranged in sequence, the laser is transmitted to the output coupling mirror after being subjected to N times of reflection of light path separation between the second reflector and the first reflector; the multi-pass gain laser further comprises a composite gain structure, the composite gain structure comprises a high heat conduction part and a gain part, the gain part comprises N gain crystals which are connected in sequence, and the nth reflected light passes through the nth gain crystal; wherein the high heat conduction part covers the surface of the gain part, and the high heat conduction part is filled in a spacing region between two adjacent gain crystals. According to the invention, the heat dissipation efficiency can be obviously improved, and the laser has high gain and high output stability.

The utility model relates to the technical field of laser heat dissipation, and discloses a flow-controllable water-cooled laser heat dissipation device. The device comprises a water cavity, two water outlet hole channels are formed in one side of the water cavity, and the two water outlet hole channels are both communicated with a water inlet hole channel; the two water outlet regulating valves are respectively arranged at the two water outlet hole channels and are used for controlling the water outlet flow at the two water outlet hole channels; the water outlet rotating screw hole is formed in the water outlet hole channel, is perpendicular to the water flow direction of the water outlet hole channel, and penetrates to the external environment from the water outlet hole channel; and the gas pressure reducing groove extends from the water outlet rotating screw hole to the direction opposite to the external environment and is used for balancing the air pressure and the water pressure at the water outlet hole channel in the adjusting process of the water outlet adjusting valve. By arranging the water outlet adjusting valve and the gas pressure reducing groove at the water outlet hole channel, the flow of water flow can be effectively controlled, so that heat dissipation is performed on part of the position of the laser in a targeted manner, the heat dissipation effect of the laser is improved, and meanwhile, a water source is buffered to avoid impacting the laser.

The invention discloses a light-weight phase change direct cooling fiber laser cold plate structure and a design method, and relates to the technical field of laser thermal management, and the light-weight phase change direct cooling fiber laser cold plate structure comprises a plate body, a phase change refrigerant flow channel, a cooling liquid flow channel and a refrigerant flow adjusting device. The phase change refrigerant flow channel adopts a series connection structure at an inlet section and adopts a parallel connection structure at an outlet section, refrigerant flow adjusting devices are respectively arranged at an inlet and an outlet of the parallel connection structure section, the adjustment of pressure and flow in the refrigerant flow channel can be realized, and the phase change refrigerant flow channel is arranged close to a pumping source surface; the cooling liquid flow channels are grouped and connected in parallel, then the parallel flow channels are connected in series, and the cooling liquid flow channels are arranged close to the optical fiber face. The invention further discloses a design method of the light-weight phase-change direct-cooling optical fiber laser cold plate. The cold plate structure disclosed by the invention can realize accurate temperature control of the pumping source of the optical fiber laser and meet the temperature control requirements of other heating components, and is simple in design method, easy to process and suitable for large-scale industrial production.

This utility model discloses a miniature ultraviolet laser device integrated with a water-cooling component. It includes an outer shell assembly, a laser body, and a liquid-cooling component housed within the outer shell assembly. The outer shell assembly is formed by a top cover, a front panel, a rear panel, a bottom plate, and side panels. The laser body is positioned near the top cover, with a temperature-conducting plate at its bottom that is in contact with a refrigerant plate. A heat exchange plate is located on one side of the refrigerant plate. The liquid-cooling component includes a water tank, a water inlet, and a water pump. The water tank is also connected to a compressor with a condenser via pipes, and the compressor is connected to the heat exchange plate via pipes. This utility model solves the problems of existing ultraviolet laser devices lacking an integrated water-cooling structure, having a large overall structure, being difficult to carry, transport, assemble, and maintain.

The invention belongs to the technical field of laser heat management, and discloses a single-pump-driven phase change cold storage laser heat management system which comprises a refrigeration unit, a cold storage unit and a liquid supply unit. The refrigeration unit generates cold energy through vapor compression refrigeration cycle and supplies the cold energy to the cold storage unit and the liquid supply unit; the cold storage unit is filled with a solid-liquid phase change material as a cold storage material to store cold energy, and the cold energy is supplied to the liquid supply unit; the liquid supply unit adopts a speed-adjustable circulating pump to provide circulating power, the rotating speed is increased during the working period of the laser, large-flow liquid supply is achieved, the heat exchange power requirement of the short-time high-power heat load of the laser is met, the rotating speed is reduced during the non-working period of the laser, and the corresponding low-power refrigeration heat exchange requirement after homogenization during the high-power heat load is matched. The advantage of high energy storage density of solid-liquid phase change cold storage is utilized to the maximum extent, the energy storage density of the cold storage unit is improved, and the size and weight of the system are reduced.

The specification discloses a double-channel laser control system and a double-channel laser, and relates to the technical field of laser control. The system comprises a controller, a temperature control assembly and an energy control assembly. The temperature control assembly comprises a pump cabin temperature control module, a first output cabin temperature control module and a second output cabin temperature control module which are independent of each other, and the energy control assembly comprises a first energy control module and a second energy control module. The temperature control modules each comprise a cooling liquid supply, an opening valve, a temperature sensor and a temperature control pipeline. The energy control modules each comprise a rotary table, an energy attenuation element and a grating ruler. The energy attenuation element is fixedly connected to the rotary table. The grating ruler is used for determining the attitude angle of the rotary table. The controller is in communication connection with the opening valve, the temperature sensor, the rotary table and the grating ruler. The controller is used for receiving data and sending instructions to adjust the opening degree of the opening valve and the angle of the rotary table. It can be seen that the temperature of each cabin and the energy of the double-channel laser can be controlled, the long-term normal use of the double-channel laser is ensured, and the stability is improved.

The utility model belongs to the technical field of laser, disclose a kind of laser case and laser. Laser case includes water-cooling plate and two cabinet side plates, two cabinet side plates are symmetrically arranged at the two sides of water-cooling plate, cabinet side plate includes groove structure, first connecting plate and second connecting plate, groove structure is set outwards convex or concave, first connecting plate and second connecting plate are respectively installed in the end of the two parallel branch side plates of groove structure, and respectively extend in the direction away from groove structure, and first connecting plate and second connecting plate are all arranged in parallel with the bottom plate of groove structure, water-cooling plate is detachably connected with second connecting plate. Laser includes laser case, the two sides of water-cooling plate are directly connected with cabinet side plate, without inside plate, reduce material, simplify overall structure, reduce manufacturing cost.

The application relates to the technical field of solid laser emitters, in particular to a device for the thermal management of a nonlinear crystal in a laser. The device comprises a base, a fixing member, a pressing member and a pressing device, the pressing member is located between the base and the vertical plate part, a through V-shaped groove is formed on the side of the pressing member facing the base, the V-shaped groove and the mounting plate of the electric push rod arranged on the base and perpendicular to each other form a containing cavity for containing the nonlinear crystal, the mounting surface of the mounting plate and the V-shaped surface of the V-shaped groove are both provided with a temperature control assembly for adjusting the temperature of the nonlinear crystal, the temperature control assembly comprises a heating plate and a heat dissipation plate; and the pressing device is used for pressing the nonlinear crystal. The device can quickly adjust the temperature of the nonlinear crystal material, realizes the efficient thermal management of the amorphous material, and improves the stability of the nonlinear crystal material.

The utility model provides a constant temperature system, which relates to the technical field of semiconductor lasers and comprises a liquid storage tank and a circulating flow channel, the circulating flow channel comprises a liquid inlet pipeline, a heat exchange structure and a liquid return pipeline, and the heat exchange pipeline is arranged in the heat exchange structure; one end of the liquid inlet pipeline is communicated with a liquid outlet of the liquid storage tank, and the other end is communicated with an inlet of the heat exchange pipeline; one end of the liquid return pipeline is communicated with a liquid inlet of the liquid storage tank, and the other end is communicated with an outlet of the heat exchange pipeline; a pump body, a heater and a flow sensor are arranged on the liquid inlet pipeline, and the pump body is used for enabling heat exchange liquid in the liquid storage tank to flow into the heat exchange pipeline; and a first temperature sensor is arranged on the liquid return pipeline.