209 results about "Laser pumping" patented technology

The invention provides a phase-locked amplification system for enhancing the signal-to-noise ratio of ultrafast laser pumping-detection transient imaging. The system comprises a signal input module which is arranged on a pumping light path and a detection light path, wherein the signal input module comprises a light splitting plain film and an imaging objective lens which are arranged in sequence, wherein the centers of the light splitting plain film and the imaging objective lens are located on a first axis; the centers of the first reflector, the filter, the focusing lens and the camera are located on a second axis in sequence, and the camera is used for shooting light reflected by the sample to obtain a first signal; the reference acquisition module comprises a beam splitting piece and a second reflecting mirror, the beam splitting piece is arranged on the pumping light path, and a reference light path is shot through a camera to obtain a second signal; and the phase-sensitive detection module is used for calculating the first signal and the second signal to obtain a carrier distribution condition at a preset moment. According to the invention, low pumping measurement is realized, the service life of a sample is prolonged, and the problem of detecting weak pumping imaging signals submerged in system background noise is solved.

A LSP broadband light source is disclosed. The light source may include a gas containment structure. The light source may include multiple jet nozzles, wherein the jet nozzles are configured to generate supersonic gas jets and direct the supersonic gas jets to collide within the gas containment structure to form a localized high-pressure region at the collision point. The light source may include a primary laser pump source, wherein the primary laser pump source is configured to direct a primary pump beam to a localized high-pressure region formed at the collision point. The light source may include a pulsed-assisting laser source, wherein the pulsed-assisting laser source is configured to direct a pulsed-assisting beam to the localized high-pressure region at the collision point. The light source may include a light collector element configured to collect broadband light emitted from the plasma.

The invention relates to a method for detecting a marine corrosion primary process, which comprises the following steps of: constructing three vacuum chambers and connecting the three vacuum chambers by using vacuum pipelines to form a detection system; ultrafast femtosecond laser with the repetition frequency being 1 kHz, the single pulse energy being 6 mJ, the pulse width being 35 fs and the central wavelength being 800 nm is generated through a pulse amplifier; one beam of 2mJ enters a vacuum chamber pipeline to be transmitted as a pulse light beam for detection in the original process of ocean corrosion, the other beam of 4mJ is transmitted outside the vacuum chamber to be used as a pump pulse light beam, and 400 nm pump pulse laser is generated through frequency doubling of a BBO crystal; the pump light beam and the detection light beam are incident on a sample of a sample mechanism in the third vacuum chamber, then the pump light beam is blocked, and only the detection light beam is incident on the sample; xUV light beams reflected from the sample are subjected to spectral dispersion and then enter a CCD detector, and the dynamic response of the sample after being excited by the pump light is monitored by measuring the transmissivity, reflectivity or absorption change of the surface of the sample.

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 provides an automatic device and method for light emitting and power optimization of 2-micron solid laser. The automatic device comprises a laser pumping source, a plano-convex lens group, a gain medium, a confocal resonant cavity, an output coupling mirror, a five-degree-of-freedom electric displacement table and a regulation and control system. Automatic optimization and stable output of laser power are realized through the design of an asymmetric confocal resonant cavity and micron-order adjustment of a high-precision five-degree-of-freedom electric displacement table in combination with a tolerance optimization algorithm and a gradient descent spiral search algorithm. A thulium-doped CYA disordered crystal is adopted as a gain medium, and the angle of the thulium-doped CYA disordered crystal is adjustable so as to excite a high-order vortex The transmittance of the output coupling mirror is dynamically adjusted according to the working mode, and the intra-cavity power density and the light-to-light conversion efficiency are ensured. The invention has the advantages of high efficiency and stability, strong universality, low cost, diversified output and the like, is suitable for the fields of space communication, quantum optics, laser processing and the like, and obviously improves the performance and application range of the laser.

A compact LSP broadband light includes a gas containment structure containing a mixture of a first noble gas and a second noble gas, a filter tube positioned within the gas containment structure, an input window, and a pump source. The laser pump source directs an optical pump through the input window to sustain a plasma within the filter tube. The first noble gas absorbs broadband light within a first and a second wavelength band. The filter tube absorbs broadband light having a wavelength below a selected threshold. The absorption of broadband light by the first noble gas and the filter tube provide long-pass filtering to protect one or more downstream optical elements. The gas containment structure includes an output optical window for transmission of filtered broadband light. The gas containment structure includes a gas inlet and outlet for generating a reverse vortex flow pattern within the filter tube.

The invention discloses an ultrafast terahertz response magnetic field measurement method and system based on a linear magneto-optical conversion material, and the method comprises the steps: preparing a linear magneto-optical conversion heterojunction film which comprises at least one signal generation layer with a linear magneto-optical conversion characteristic and at least one signal emission layer with a strong spin-orbit coupling effect; placing the heterojunction thin film at the position of a magnetic field to be measured, and irradiating the heterojunction thin film by using femtosecond laser pumping pulse so as to enable the heterojunction thin film to radiate a terahertz signal; through the terahertz vector detection and rotation detection system, the positive and negative and the magnitude of terahertz signals radiated by the heterojunction film in three groups of orthogonal directions are detected, and the magnetic field direction and the magnitude of the magnetic field position to be detected are calculated based on the three groups of terahertz signals. The sensor has the advantages of being high in sensitivity, high in response speed, non-contact and the like, can achieve rapid detection of various vector magnetic fields such as stable, periodic modulation and sub-picosecond transient pulse, and has hundred-nanometer-scale spatial resolution capacity.

The invention discloses a method for measuring the elasticity modulus of a semiconductor material, which comprises the following steps of: exciting the semiconductor material by using femtosecond laser pulse through an ultrafast laser pumping detection technology, enabling the material to generate thermoelastic pressure, transmitting the thermoelastic pressure into the material, and measuring the elasticity modulus of the semiconductor material by using detection pulses at different moments. And detecting the thermoelastic pressure transmission rate of the material, and finally calculating the elastic modulus of the semiconductor material according to the quantitative relationship between the elastic modulus and the thermoelastic pressure transmission rate. According to the measuring method, the optical area can be as small as micron dimension, so that the elasticity modulus of the micron-dimension semiconductor material can be tested. In addition, mechanical pressure does not need to be applied to the semiconductor material based on optical measurement, measurement of the elastic modulus of the material can be completed in a non-contact mode, and damage to the material is avoided. Therefore, the method has wide development potential.

A magnetic field measurement method based on multi-focus array laser pumping atomic spinning comprises the steps that pumping light is subjected to phase modulation through a spatial light modulator to generate a multi-focus circularly polarized light array, light intensity distribution of focuses of the multi-focus circularly polarized light array on a transverse plane is uniform, and the distances between the focuses of the multi-focus circularly polarized light array are consistent; therefore, the problem of non-uniform distribution of the laser in the transverse direction due to Gaussian light intensity is effectively compensated. In the longitudinal direction, according to the law of energy attenuation caused by the action of light and atoms, the focus light intensity is designed to be gradually enhanced along with the z-axis depth in combination with an anti-Lambert-W function, and a focus array is uniformly focused at the center of an alkali metal gas chamber by expanding the focus depth, so that the transverse and longitudinal polarizability uniformity of alkali metal atoms is remarkably improved, the optical frequency shift virtual magnetic field gradient is inhibited, and the stability of the alkali metal gas chamber is improved. And the common-mode rejection ratio, the signal-to-noise ratio and the response sensitivity of the SERF magnetic field measuring device are improved. The focus array is optimized in real time through detection feedback, efficient compensation and regulation are achieved, and the method is suitable for accurate measurement of the sub-fT-level weak magnetic field.

The mid-infrared optical parametric oscillator pumped by the dual-wavelength nanosecond pulse solid laser can simultaneously output 1.9 micron laser and 2.1 micron laser, realizes broad spectrum / multi-wavelength output of the mid-infrared optical parametric oscillator, and can ensure that mid-infrared laser has excellent beam quality and relatively high output power. The output power of the 1.9 [mu] m optical fiber laser pumping source is hectowatt magnitude, and the 1.9 [mu] m optical fiber laser pumping source serves as a pumping source of a Ho crystal in the solid laser oscillator. In a Tm solid laser oscillator and a Ho solid laser oscillator, a resonant cavity comprises two plano-concave sub-cavities, the two plano-concave sub-cavities are a Tm crystal oscillation cavity and a Ho crystal oscillation cavity respectively, the two plano-concave sub-cavities share one output mirror, the Tm crystal oscillation cavity adopts a 793 nm semiconductor laser for pumping, and the Ho crystal oscillation cavity adopts a 1.9 [mu] m optical fiber laser pumping source I for pumping; in the phosphorus-germanium-zinc optical parametric oscillator, a planar four-mirror annular cavity is used as a single-resonance optical parametric oscillation cavity.

The invention discloses a femtosecond ultrasonic wafer metal film multi-layer measurement system, method and device, and the system comprises a sample platform which is used for flatly placing a wafer sample to be measured; the main light path is used for generating laser and separating the laser into pumping laser and detection laser; the pumping laser path and the detection laser path are respectively used for guiding the pumping laser and the detection laser to be successively projected onto the surface of the wafer sample; the receiving unit is used for processing a reflected light beam returned from the surface of the wafer sample and comprises a pump light beam eliminator to isolate residual reflected light of the pump laser in the reflected light beam; the detection laser detection assembly is used for collecting the reflected detection laser, processing the reflected detection laser and converting an optical signal into an electric signal to obtain reflected signal intensity change data of the reflected detection laser; and the controller is used for acquiring the flight time of the detection laser based on the reflected signal intensity change data so as to acquire the thickness of the wafer metal film. And the pump light beam eliminator reduces pump light leakage and scattering, and the SNR (Signal to Noise Ratio) is improved.

A system for frequency conversion of laser pump radiation includes an optical element for frequency conversion of lasers or laser beams with power scalability. The element has a nonlinear birefringent, thin plate crystal. A pump beam generates frequency-shifted radiation. Phase or quasi-phase matching conditions are in the crystal between beams. Frontside and backside of the crystal have high-reflective and partially-reflective coatings, obtaining intensity enhancement of the pump and frequency-converted radiation, and maintaining relative phase delay between beams, maximizing conversion efficiency. The crystal contacts a heat sink through the high-reflective coating, minimizing temperature inhomogeneity in the crystal. Intrinsic longitudinal heat flow provides power scalability. The element, used intra-cavity, acts as a wavelength-selective component forcing laser operation on resonance of the element, maximizing frequency conversion. The wavelength selectivity allows single-frequency operation of high-power lasers with intra-cavity frequency conversion.

A multi-cavity system for intracavity laser pumping, comprising a first laser cavity. The first laser cavity may comprise a first gain chip, configured to generate a first laser beam, and a first end mirror disposed optically in line with the first gain chip, configured to reflect the first laser beam back to the first gain chip. The first laser cavity may further comprise a second gain chip disposed optically in line with the first gain chip. The first laser beam may be configured to excite the second gain chip. The second gain chip may be configured to generate a second laser beam upon excitation by the first laser beam. The system may further comprise a second laser cavity at least partially intersecting with the first laser cavity. The second laser beam may be configured to be directed through the second laser cavity.

The invention discloses a laser pumping source protection device and an optical fiber laser. The laser pumping source protection device comprises a laser pumping device, a pumping source isolator, a pumping source protector, a high-reflectivity grating group, an optical fiber beam combiner, a seed source, an active optical fiber and a signal optical isolator. Wherein the pumping source isolator, the pumping source protector and the high-reflection grating group are sequentially arranged along a laser propagation path, so that medium-frequency-band reverse light is blocked by the pumping source isolator, low-frequency-band reverse light is inhibited by the pumping source protector, and high-frequency-band reverse light is reflected by the high-reflection grating group. The seed source is used for transmitting signal light, the optical fiber beam combiner is used for coupling the signal light and pump light, the active optical fiber is used for exciting doped ions and amplifying the signal light, and the signal light isolator is used for isolating the signal light in the coupled light. According to the device, the three different optical suppression elements are used for blocking or reflecting the reverse light of different wavebands to form three-level protection, so that the reliability of the laser is improved, and the service life of the laser is prolonged.

The invention belongs to the technical field of nonlinear optical crystals, and particularly relates to a zeolite-like structure nitrogen oxide silicate nonlinear optical crystal and a preparation method and application thereof, the chemical general formula of the crystal is Ba3Si3N5OCl, the crystal belongs to a hexagonal system, the cell parameters of the crystal are as follows: a is 9.5147 (6), c is 5.5002 (4), V is 431.22 (6) 3, Z is 2, the space group is P-62c, and the crystal has a non-centrosymmetric structure. The Ba3Si3N5OCl crystal provided by the invention is used as a novel zeolite-like structure nitrogen oxide silicate, successfully integrates nonlinear optical activity and phase matching capability, can generate frequency doubling response which is about 0.2 times of KDP (potassium dihydrogen phosphate) under 1064 nm laser pumping, and can realize phase matching, so that the Ba3Si3N5OCl crystal becomes a nonlinear optical material with practical device application potential.

A polarization beam splitting prism assembly (140) and a laser pumping source (100). A second light-emitting surface (1422) of a polarizer (142) and a first light-emitting surface (1412) of a half-wave plate (141) are provided opposite to each other, and an included angle between the first light-emitting surface (1412) and the second light-emitting surface (1422) is an acute angle. In addition, the second light-emitting surface (1422) of the polarizer (142) is provided with a polarizing film (144) used for transmitting light emitted from the second light-emitting surface (1422) and reflecting light emitted from the first light-emitting surface (1412), so that incident light of a first light incident surface (1411) and a second light incident surface (1421) is combined, and heat absorption is reduced, thereby ameliorating the temperature rise of the polarization beam splitting prism assembly (140).

The utility model discloses a laser pumping source and a laser. The laser pumping source comprises a pump body, a flow channel and a capillary tube. A cavity for placing a chip is formed in the pump body, and a chip contact surface for attaching the chip is arranged on the bottom surface of the cavity; the flow channel is formed in the shell between the cavity and the bottom of the pump body and is filled with a condensing medium; the flow channel comprises a front-section flow channel and a rear-section flow channel which are arranged in the length direction of the flow channel in a penetrating manner, the front-section flow channel is arranged below the chip contact surface in an inclined downward manner, and the rear-section flow channel extends to an area beyond the coverage of the chip contact surface; the capillary tube is arranged on the inner wall of the flow channel in the extending direction of the length of the flow channel. According to the technical scheme, when the pump source works, the condensing medium can absorb heat generated by the chip in the front-section flow channel to evaporate and is extruded to the rear-section flow channel to be condensed into a liquid state, and the liquid condensing medium in the rear-section flow channel can flow back to the front-section flow channel under the capillary action of the capillary tube to absorb heat and evaporate again, so that the heat generated by the chip is circularly taken away; and the heat dissipation performance of the pump source is improved.

This invention discloses a 2.3 μm fiber laser based on 980 nm laser pumping, relating to the field of mid-infrared fiber laser technology. This fiber laser utilizes fluorotellurate glass fiber co-doped with thulium and erbium ions as the gain medium. It absorbs the 980 nm pump light energy by introducing erbium ion doping, and then achieves Tm through the energy transfer process between erbium and thulium ions. 3+ of 3 H4- 3 The population inversion of the H5 energy level ultimately yields laser output in the 2.3 μm band. This invention utilizes a high-power 980 nm laser as the pump source and a thulium-erbium co-doped fluorotellurate glass fiber prepared by the rod-tube method as the gain medium. By writing fiber gratings with appropriate reflectivity at both ends of the fiber, a resonant cavity with a reflection wavelength of 2.3 μm is constructed, enabling the development of a high-power 2.3 μm laser that can operate stably for a long time.

The invention belongs to the technical field of semiconductor laser packaging, and particularly relates to a rapid detection method and detection device for deformation of a pumping source shell of a semiconductor laser, and the method comprises the steps: clamping the pumping source shell through an L-shaped positioning block; identifying the contour of the shell by using a visual mechanism and setting a detection point; the shell is sequentially driven to complete contact type deformation data acquisition of the X-axis frame, the Y-axis frame and the Z-axis internal step; performing comprehensive analysis and qualification judgment on the multi-axis data by the touch control mechanism; and finally displaying a result and alarming when the result is abnormal. According to the invention, full-automatic and multi-dimensional deformation rapid detection is realized, visual guidance is combined with a replaceable positioning block, and the device is suitable for shells of different models. And through three-axis high-precision contact type measurement, data can be quantitatively evaluated to form and position errors such as flatness and step height. According to the invention, data processing and alarming are integrated, the quality and the equipment state are monitored in real time, and the reliability is improved.

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 present invention provides a light-generation system (1000) including a first light-generation device (110), a luminescent body (1200), a thermally conductive element (500), and an axicon-like optical element (400), wherein: (A) the first light-generation device (110) is configured to generate first device light (111), the first light-generation device (110) including one or more of a superluminescent diode and a solid-state laser; (B) the luminescent body ( (1200) includes a luminescent material (200) configured to convert at least a portion of the first device light (111) into luminescent material light (201), the luminescent body (1200) having an annular shape; and (C) a thermally conductive element (500) configured (a) to be in thermal contact with at least a portion of the luminescent body (1200), and (b) to convert at least one of the first device light (111) and the luminescent material light (201). (D) the axicon-like optical element (400) comprises a first portion (410) and a second portion (420) and has an optical element length (L), the first portion (410) having a conical shape, a first length (L1) and comprising a first end window (411), the second portion (420) having a cylindrical shape, a second length (L2) and comprising a second end window (422), where 0.7≦L2 / L<1; (E) the axicon-like optical element (400) comprises: (a) a first portion (410) and a second portion (420) and having an optical element length (L), the first portion (410) having a conical shape, a first length (L1) and comprising a first end window (411), the second portion (420) having a cylindrical shape, a second length (L2) and comprising a second end window (422), where 0.7≦L2 / L<1; A light generating system is provided that is configured to (a) receive at least a portion of a first device light (111) via a portion (410) and provide an annular beam of the first device light (111) to a luminescent body (1200) via a second portion (420), and (b) collect at least a portion of a luminescent material light (201) via the second portion (420) and provide a beam of luminescent material light (201) via the first portion (410).

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 invention discloses a dual-channel laser amplification device and method, and belongs to the technical field of lasers, and the device comprises a first seed laser unit and a second seed laser unit which are used for outputting two seed lasers with different incident angles and different refractive indexes in a gain medium; the pumping module is used for generating pumping light to provide pumping conditions for power amplification of the two beams of seed laser; the thermal control module is used for providing working temperature control conditions for the whole device; the laser gain medium is used for receiving two beams of seed laser incident from different incident angles through the incident end face and emitting the seed laser at the same angle through the emergent end face after multiple times of total reflection with different paths in the gain medium; and the third laser beam output unit is used for combining the two beams of seed laser emitted at the same angle to obtain an output light beam after power amplification. Power amplification of two laser beams is realized based on the single laser gain module, the laser beam combining function is realized, and the integration level of the laser amplifier and the light beam combining system is effectively improved.

The invention discloses a defect detection method based on light wavefront. The defect detection method comprises the following steps: arranging an object to be detected on a base; providing a laser device which comprises a laser pump and a laser light source and emits a first laser beam towards the detection part of the object to be detected; providing a first light wavefront sensor, wherein the first light wavefront sensor receives first reflected light of the first laser beam reflected by the detection part of the to-be-detected object to generate a first reflected light signal, or receives first penetrating light of the first laser beam penetrating through the detection part of the to-be-detected object to generate a first penetrating light signal; providing a waveform generator which is electrically connected with the first optical wavefront sensor, and receiving the first reflected light signal or the first penetrating light signal by the waveform generator to generate a first detection oscillogram; the invention further provides a defect detection system based on the light wavefront.

The present invention discloses a dual-channel laser amplification device and method, belonging to the field of laser technology. The device comprises: a first seed laser unit and a second seed laser unit for outputting two seed laser beams with different incident angles and refractive indices in a gain medium; a pump module for generating pump light to provide pumping conditions for power amplification of the two seed laser beams; a thermal control module for providing operating temperature control conditions for the entire device; a laser gain medium for receiving two seed laser beams incident at different incident angles through an incident end face, and after undergoing several total reflections with different paths within the gain medium, emitting the two seed laser beams at the same angle through an exit end face; and a third laser beam output unit for combining the two seed laser beams emitted at the same angle to produce a power-amplified output beam. The present invention uses a single laser gain module to achieve power amplification of two laser beams and has a laser beam combining function, effectively improving the integration of the laser amplifier and beam combining system.

The invention belongs to the technical field of optical fiber lasers, and discloses a multi-soliton-state adjustable optical fiber laser based on a time delay polarization multiplexing structure. The fiber laser comprises a laser pumping source, a wavelength division multiplexer, an erbium-doped gain fiber, a polarization independent isolator, a mode locking device based on a carbon nanotube saturable absorber, a polarization beam splitter, a polarization beam combiner and an output coupler which are sequentially connected through a single-mode fiber. A time delay polarization multiplexing structure of the optical fiber laser adopts a combination of a polarization beam splitter, a single-mode optical fiber and a polarization beam combiner, and the lengths of the single-mode optical fibers on two branches are obviously different. Therefore, traditional solitons conforming to independent mode locking of the long and short cavities can be output, and long-cavity or short-cavity-dominated master-slave soliton equally-spaced soliton beams and long-cavity and short-cavity periodic alternately-spaced pulse output can be generated. According to the invention, by introducing a time delay polarization multiplexing structure, the limitation of a traditional annular cavity is broken through, and a new solution is provided for the generation and dynamic regulation of multiple soliton states.

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 invention belongs to the technical field of semiconductor laser pumping solid lasers, and discloses a semiconductor side pumping solid laser module based on a multi-cavity reflection light-gathering cavity, which comprises a multi-cavity reflection light-gathering cavity (2), an elliptical cavity and a semicircular cavity which are formed in the multi-cavity reflection light-gathering cavity (2), and the inner walls of the elliptical cavity and the semicircular cavity are reflecting surfaces. An LD bar (1) and a thin rod type laser working medium (3) are arranged in the multi-cavity reflection condensation cavity (2), pump light emitted by a luminous point of the LD bar (1) is reflected by the inner wall and then converged at the axis position of the thin rod type laser working medium (3), residual pump light absorbed by the thin rod type laser working medium (3) is reflected back to the thin rod type laser working medium (3) again, and the residual pump light is converged at the axis position of the thin rod type laser working medium (3). And residual pumping light energy is absorbed again, so that high-efficiency pumping is realized. According to the invention, the utilization efficiency of pump light energy is improved, and under the same laser output power, the volume, weight and power consumption indexes of the pumping part of the laser are reduced.

The invention provides a multi-laser-beam 3D printing head for additive manufacturing and a 3D printing device, the multi-laser-beam 3D printing head for additive manufacturing comprises a shell, the shell is provided with a plurality of first parts, the multiple first parts annularly surround the center axis of the shell, a connecting part is arranged between every two adjacent first parts, each first part is provided with a concave area and a non-concave plane, and the concave area and the non-concave plane are arranged in parallel; for each first part, the distance between the concave area of the first part and the central axis is smaller than the distance between the non-concave plane of the first part and the central axis; the plurality of laser pumping sources and the plurality of first parts are arranged in a one-to-one correspondence manner, each laser pumping source is arranged in the corresponding first part, each laser pumping source comprises a plurality of chips and an optical assembly, and the plurality of chips and the optical assemblies of the laser pumping sources are arranged in the concave areas of the corresponding first parts; according to the printing head, the chip and the optical assembly of the laser pumping source can be protected, the overall structure and laser output of the printing head can be more stable, and optical path loss can be effectively reduced.

The invention relates to a spatial displacement laser spectrum detection method for wood identification. The method comprises four steps of instrument initialization, surface layer laser spectrum detection, base layer spatial displacement spectrum detection and comprehensive spectrum analysis of a detection target. The beneficial effects are that the same infrared laser is used as a laser pumping source of the infrared photonic crystal fiber and an infrared laser source for spatial displacement spectrum detection. The infrared absorption spectrum of the target surface layer and the infrared laser Raman and fluorescence spectrum of the base layer in the same wave number section can be detected at the same time, so that the material identification of the surface layer and the base layer is realized at the same time. Meanwhile, the wave number resolution of the infrared spectrum Fourier transform spectrum module is high, so that the high-resolution infrared laser Raman and fluorescence spectrum of the base layer can be obtained, and fine spectrum data is provided for base layer material identification. And the requirement for on-site rapid detection of wood products is met.