430 results about "Beam expander" patented technology

The invention relates to the technical field of laser processing, in particular to a laser light path rapid switching method and related equipment. The laser light path fast switching method comprises the steps that a single laser emits original laser, the original laser passes through a laser collimator or directly enters a multi-channel reflecting mirror set to adjust a transmission path, a beam expander is selectively started for beam expanding according to the machining requirement, a preliminary shaping light beam is formed, and a basic light path matched with a follow-up optical device is constructed. According to the invention, through the integrated driving mechanism and grating ruler full-closed-loop control rapid switching device, the mobile carrier pre-installed with multiple DOEs is driven to realize accurate cutting-in of a target light spot element in a light path, and the problem of rapid adaptation of multiple light spot patterns in a single laser system is solved.

A laser beam expanding lighting device comprises an incident laser adjusting module, an adjustable base module and a beam expanding lens set module, a parallel light beam injection port and a plane mirror are installed in the incident laser adjusting module, and after collimation, a laser mirror is transmitted to a beam expanding lens set after being reflected by the two adjustable plane mirrors; the beam expanding lens group realizes the adjustment of the beam expanding angle and the beam expanding multiple by combining different beam expanding lenses and adjusting the distance between the beam expanding lenses; the beam expanding lens set is installed on the adjustable base, the adjustable base achieves deviation of the axis of the beam expanding lens set in two directions relative to the axis of laser through an ejector pin-spring linkage mechanism, the irradiation position of the laser on the beam expanding lens is changed, and adjustment of a laser illumination area is achieved while beam expanding is conducted. The parallel light beam injection port and the beam expanding lens group of the device can be arranged in a non-coaxial mode, the application range is wide, the overall structure is compact, operation is convenient, and various adjusting adaptability is achieved.

The invention discloses a light spot adjustable optical system, a diffraction optical module and laser processing equipment, and relates to the technical field of precision processing. The optical system comprises a laser, a beam expander, a diffractive optical module and a focusing module which are sequentially arranged in the light path direction, the diffractive optical module comprises at least one diffractive optical element, and the diffractive optical element is manufactured based on a geometric phase liquid crystal polymer birefringent material. The diffractive optical module is used for regulating and controlling light spot characteristic parameters corresponding to a Gaussian beam, the Gaussian beam is emitted by the laser and enters the diffractive optical module after being expanded and collimated by the beam expander, and the light spot characteristic parameters comprise a light spot distribution position and light spot energy intensity. By the adoption of the optical system, laser energy distribution can be optimized, splashing is effectively restrained, and the welding quality and the processing efficiency are improved.

The invention discloses a femtosecond optical comb large-size precision absolute distance measurement system in a complex environment. Comprising a source module, a beam splitter, a third dichroic mirror, a fundamental frequency femtosecond optical comb reference detector, a frequency doubling femtosecond optical comb reference detector, a fourth dichroic mirror, a frequency doubling femtosecond optical comb measurement detector, a fundamental frequency femtosecond optical comb measurement detector, a phase discriminator, a ranging zero point mirror and a corner reflector. The source module comprises an atomic clock, a femtosecond optical comb, an optical fiber beam splitter, a signal generator, an electro-optical modulator, a lens, a frequency multiplication module, a first collimation beam expander, a second collimation beam expander, a first dichroic mirror and a second dichroic mirror. According to the scheme, the defects that in the prior art, the measurement range is insufficient, complex industrial sites are difficult to adapt, and the real-time performance is poor are overcome, and a new way is provided for breaking through the technical bottleneck of large-range, high-precision, dead-zone-free, rapid and real-time measurement in a complex environment; and a technical support is provided for engineering application of a femtosecond optical comb precision distance measurement technology and development of a subsequent measurement prototype.

The utility model belongs to the field of laser application, and relates to beam shaping of a laser, in particular to a small-divergence-angle laser based on a beam shaping technology. The problems that in the prior art for laser diode collimation, astigmatism of the diode cannot be calibrated through single-lens collimation, and cost is increased due to the fact that fast axis collimation and slow axis collimation need to customize a fast axis collimating lens with a proper focal length are solved. The utility model discloses a small-divergence-angle laser based on a beam shaping technology. A first collimating lens, a fast-axis beam shrinking device and a beam expander are sequentially arranged on an emergent light path of a first laser diode; the light emitting point of the first laser diode is located at the focal point of the first collimating lens, the fast axis beam shrinking device comprises a first cylindrical lens and a second cylindrical lens, and the focal points of the first cylindrical lens and the second cylindrical lens coincide. According to the utility model, the divergence angle of the laser diode is reduced to 0.1 mrad, so that the diameter of a light spot at 500m is less than 100mm, and the actual light spot observed in an experiment is 80mm.

A handheld drone denial device, characterized in that the device comprises a laser emission unit comprising a high peak power pulsed laser and an adjustable beam expander, a sighting unit comprising a range finder and a sighting scope, a control unit comprising a denial device start and laser emission unit trigger switch, a power supply and a housing, the configuration of the laser emission unit, sighting unit, control unit, power supply, the structure of the housing and the arrangement of the units including the power supply on the carrier satisfy that the device discovers, locks and measures the range of a drone target through the sighting unit, manually or automatically adjusts the output laser beam divergence angle of the beam expander according to the range measurement result, and then or simultaneously triggers the laser emission unit trigger switch to emit laser to the drone target, wherein the adjustment of the beam expander includes that the adjustment of the beam divergence angle from a range of 500 meters to a range of 100 meters is incremental adjustment, or the adjustment of the beam divergence angle from a range of 100 meters to a range of 500 meters is decremental adjustment.

The application discloses a laser cavity diagnosis device and method based on double-frame delay synchronization phase shift, which comprises an excitation module and a detection module; the excitation module comprises a first laser, a first 1 / 2 wave plate, a polarization beam splitter prism, a beam splitter, an energy meter, a convex lens and a water tank; the detection module comprises a second laser, a beam expander lens group, a second 1 / 2 wave plate, a second polarization beam splitter prism, a third 1 / 2 wave plate, a first reflector, a second reflector, a fourth 1 / 2 wave plate, a third polarization beam splitter prism, a third reflector, a fourth polarization beam splitter prism, a first 1 / 4 wave plate, a first imaging lens, a first micro-polarization camera, a second 1 / 4 wave plate, a second imaging lens and a second micro-polarization camera. The application introduces a double-frame delay method in the traditional synchronous phase shift interference, overcomes the defects of the existing cavity detection technology, and realizes the observation of the instantaneous phase change in a single cavity pulsation period.

The invention discloses an optical axis calibration method and device applied to a projection illumination light path, and belongs to the technical field of optics, and the device comprises a laser which is used for transmitting an initial collimated light beam; the forward beam expander is arranged on a light emitting path of the laser and is used for expanding the initial collimated light beam to form large-aperture collimated light; the beam splitter is arranged on an emergent light path of the forward beam expander and is used for splitting the large-aperture collimated light into a reflected light beam and a transmitted light beam; the reflecting mirror is arranged in a transmission light path of the beam splitter and is used for reflecting the transmission light beam back to the beam splitter; and the reverse beam expander is arranged in a reflection light path of the beam splitter and is used for converging the reflection light beams into a point light source. According to the invention, the abstract'optical axis alignment 'problem is converted into visual'light spot superposition' judgment, the principle breakthrough from traditional indirect energy measurement to direct spatial position comparison is realized, and the calibration precision is improved.

The invention provides a measurement system, method, device and equipment, a medium and a product, and belongs to the technical field of optics. The system comprises a beam expander used for generating a first transmission light beam and a first reflection light beam when a light beam after beam expansion reaches a tested sample at a first preset position; a beam compressor; the receiver is positioned at a first position and is used for receiving the first transmission light beam to generate a first interferogram of the detected sample; the receiver is positioned at a second position and is used for receiving the first reflected light beam to generate a second interferogram of the detected sample; the first microscope objective is used for generating a second transmission light beam and a second reflection light beam by enabling the focused light beam to reach a detected sample at a second preset position; a second microscope objective; the receiver is positioned at a third position and is used for receiving the second transmission light beam to generate a third interference pattern of the detected sample; and the receiver at the second position is also used for receiving the second reflected light beam to generate a fourth interferogram of the tested sample.

A device for therapeutic and / or cosmetic applications using a combination of soft laser and vacuum, comprising a hollow housing (11) containing at least one laser unit (20), a beam expander (26) placed in its light path and elements for refracting the direction of the light, a hollow bell (13) which is releasably connectable to one end of the housing (11) and has an outer flange (35) which is adapted to be fitted onto the skin surface to be treated, and a vacuum pump (17), wherein the vacuum pump (17) is located in the interior of the housing (11) and comprises a vacuum valve (18) located in the cavity of the housing (11), and two pipe stubs (33, 34) connecting the lower part (21) of the housing (11) to said interior (32), one of the pipe stubs (34) is connected to the suction side of the vacuum pump (17), and the other pipe stub (33) connects the inner space (32) of the bell (13) to one side of the vacuum valve (18), the other side of which is connected to the cavity of the housing (11) and comprises a control unit (40) which controls the vacuum valve (18), the vacuum pump (17) and the laser unit (20), and ensures that, when the bell (13) is placed on the skin surface (30) to be treated, a vacuum is generated in the interior (32) with a given time sequence and that the scattered light of the laser unit (20) is then incident on the skin surface (30) to be treated.

The invention discloses a holographic ruler transverse measurement system based on a metasurface, which belongs to the technical field of holographic optical measurement and comprises a holographic ruler generation system, an observation system and a holographic ruler. The holographic ruler generation system comprises a holographic ruler shell, an illumination light system and a holographic reticle; the illumination light system and the holographic reticle are arranged in the holographic ruler shell, and an observation window is arranged on the holographic ruler shell; the illumination light system comprises a semiconductor laser, a 1 / 4 wave plate, a beam expander and a reflector; the holographic rulers are virtual focuses with the same focal length, the distance between the virtual focuses is 0.1-1000mm, and the virtual focuses are transversely arranged. The holographic ruler transverse measurement system based on the metasurface is long in measurement endurance time, high in measurement precision, high in measurement performance, small and exquisite in structure, convenient to use and capable of being easily applied to various occasions.

The utility model provides a macro-energy laser energy measuring device, which comprises a beam expanding lens, a polarization beam splitter and two wedge-shaped mirrors which are arranged along a light beam propagation path, the polarization beam splitter is matched with the beam expanding lens to divide an expanded light beam into two polarized light beams, and the number of the wedge-shaped mirrors is two. And the two wedge-shaped mirrors are matched with the polarization beam splitter and are used for respectively splitting the two beams of polarized light in proportion and then enabling the two beams of polarized light to enter a light measurement area. According to the utility model, the PBS, namely the polarization beam splitter, is combined with the wedge-shaped mirror, so that the change of the light splitting proportion caused by the thermal depolarization effect of the high-power laser is avoided, and the influence of the polarization state change of the high-power laser under the change of the thermal effect on the measurement is reduced, thereby improving the precision of energy measurement; the light spot area is increased through the beam expanding lens, and the damage threshold is improved; according to the utility model, as the precision of energy measurement is improved, light beams can be prevented from directly hitting on the probe of the energy meter, and after the damage threshold is improved, the damage risk of an instrument is greatly reduced, the service life of the instrument is prolonged, and the measurement cost is reduced.

The invention discloses a displacement measurement method and system based on orbital angular momentum light beam conjugate interference, and the method comprises the steps: enabling linearly polarized light emitted by a laser to pass through an optical attenuator, a light beam expander, a quarter-wave plate and a vortex wave plate to form a light beam with orbital angular momentum, and enabling the light beam to pass through a beam splitter to be divided into a reference light beam and a measurement light beam. A measurement light beam is vertically incident on a reflection grating, and the mth-order diffraction light is incident on a first cube-corner prism and is reflected back to a diffraction grating to be subjected to secondary diffraction. And after the reference beam passes through the second cube-corner prism, the topological charge symbol of the reference beam is changed by the Dove prism. The reference light beam and the measurement light beam generate conjugate interference at the beam splitter prism, a petal-shaped interference pattern collected by the CCD is demodulated, and in-plane and out-of-plane two-dimensional displacement of the grating is calculated. The system has the characteristics of simple and compact structure, strong anti-interference capability, high precision and the like, and can be widely applied to the fields of high-end equipment manufacturing, semiconductor industry, precision metering and the like.

The invention belongs to the technical field of building tools, and discloses a grating type wall brick laser pay-off device which comprises a supporting mechanism, an adjusting mechanism is installed on the supporting mechanism, an optical mechanism is installed on the adjusting mechanism, and the supporting mechanism is used for providing stable support for the whole device and can adjust the height of the optical mechanism. The adjusting mechanism is used for achieving horizontal calibration, vertical calibration and distance calibration with a to-be-constructed wall face on the optical mechanism, and the optical mechanism is used for conducting projection on the to-be-constructed wall face to form clear and straight wall brick laying reference grid lines with the uniform distance. Through the coaxial optical design of the laser, the five-time Galileo beam expanding lens, the DOE grating and the plano-convex lens and the multi-dimensional accurate calibration of the adjusting mechanism, it is ensured that wall tiles, floor tiles and suspended ceilings are accurately crossed and jointed, internal and external corners are straight, and the pain point that traditional paying-off precision is insufficient is solved.

The application discloses a kind of film photovoltaic material scribe processing equipment.The equipment includes: rack, bottom plate, end plate, stage, support assembly and laser processing component;Bottom plate is arranged on rack;End plate is arranged on bottom plate;Stage is arranged on end plate;Support assembly is arranged on bottom plate;Laser processing component includes first light source, second light source, first reflector, beam expander, second reflector, shift piece, third reflector and cutting head;First light source is arranged on support table;First reflector is arranged on the right side of first light source, and the front side is provided with beam expander, through hole and second reflector;Shift piece is arranged on transmission component;Third reflector is arranged on the left side of second reflector;Second light source is arranged on the upper side of third reflector;Cutting head is arranged on the lower side of third reflector.Through multiple laser cutting, the applicability of the equipment for thin film photovoltaic material can be improved.

The utility model provides a beam expanding magnification detection device of a beam expander. The beam expanding magnification detection device comprises a laser, a collimating lens group, a detection assembly and the beam expander, the laser is used for emitting laser beams; the collimating lens group is used for collimating laser beams emitted by the laser; the detection assembly is used for detecting the collimation degree of the laser beam passing through the collimating lens group and detecting the size of a first light spot of the laser beam passing through the collimating lens group; the beam expander is used for expanding the laser beam collimated by the collimator group; the detection assembly is further used for detecting the collimation degree of the laser beam passing through the beam expander and detecting the size of a second light spot of the laser beam passing through the beam expander. When the beam expanding multiplying power detection device of the beam expanding lens is used, the divergence angle of the laser is adjusted through the collimating lens set, so that the laser beam before entering the beam expanding lens is collimated light, after the collimation degree of the laser beam is measured, the incident light spot and the emergent light spot of the beam expanding lens are measured, and the beam expanding multiplying power of the beam expanding lens is obtained.

The invention relates to a near-to-eye display optical system based on a laser light source and an LCOS modulation module, and belongs to the technical field of near-to-eye display. The invention aims to solve the technical problems that the existing near-to-eye display scheme is difficult to overcome speckle noise, chromatic dispersion, low luminous efficiency, overlarge size and the like at the same time. The system sequentially comprises a multi-mode laser light source module used for emitting low-initial speckle contrast imaging laser beams; the optical preprocessing module comprises a collimating lens group, a beam expanding prism and a phase perturber; the LCOS modulation module is used for simultaneously carrying out amplitude modulation on the light beam according to the image signal so as to load an image and carry out phase modulation so as to adjust wavefront, and reflecting and outputting an image light beam; the coupling module is used for carrying out light path coupling on the image light beam; and the near-to-eye display module is used for transmitting and projecting an image to human eyes. The system is mainly suitable for augmented reality glasses and other head-mounted display devices, and can realize high-image-quality and miniaturized near-to-eye imaging.

The application discloses a vortex light interference device and method for measuring three-dimensional vibration and sound field rotation characteristics, wherein a helium-neon laser emits laser light, the laser light passes through a half-wave plate and a first polarization beam splitter prism, and is divided into object light and reference light; the object light passes through a first spiral phase plate and becomes vortex object light, the vortex object light passes through a second polarization beam splitter prism, a quarter-wave plate, and a beam expander lens, and is irradiated on a test sample surface, reflected light of the sample surface passes through the beam expander lens, the quarter-wave plate, the second polarization beam splitter prism, a beam splitter prism and a focusing lens, and is irradiated on a photodetector; the reference light passes through an acousto-optic modulator to generate frequency modulation, passes through a mirror and a second spiral phase plate to become frequency-modulated vortex light, and the vortex light passes through a beam splitter prism and a focusing lens and is irradiated on the photodetector; a computer calculates and demodulates frequency-modulated signals of the photodetector and modulation signals of the acousto-optic modulator, and finally obtains three-dimensional vibration information and sound field rotation characteristics of the sample.

The application relates to a laser annealing device for improving a CMOS wafer shallow junction process, which comprises a laser, a beam pointing adjustment system, a beam expander, a power adjustment system, a knife edge, a third beam combiner, a beam quality analyzer, an integrating mirror, a heating disc, a motion platform, a computer, a three-color temperature thermal emission detector and a laser range finder. The power adjustment system is composed of a lambda / 2 glass and a polarizer arranged on an optical path. The laser emits light with fixed power, the power adjustment system simultaneously controls the output power and the polarization, and avoids problems such as beam quality deterioration and power stability reduction caused by laser power change; the beam quality analyzer, the three-color temperature thermal emission detector and the power adjustment system jointly form an annealing power negative feedback system, and the annealing power size and stability are controlled in real time according to the annealing area temperature feedback result.

The invention relates to a glass cutting laser light path structure which comprises a laser used for emitting laser, a first reflector, a second reflector and a third reflector which are used for reflecting the laser to a beam expander, and a fourth reflector and a fifth reflector which are used for reflecting the laser penetrating through the beam expander to a laser cutting head, each of the first reflector, the second reflector, the third reflector, the fourth reflector and the fifth reflector comprises a mounting plate, each mounting plate is connected with a right-angle base through a spring, a mounting hole for mounting a lens is formed in the center of each mounting plate, and an adjusting mechanism for adjusting the angle of the lens is arranged on each mounting plate. A worm and gear transmission structure is arranged on the basis of a traditional adjusting screw, the worm rotates by one circle, the adjusting screw rotates by one tooth, in this way, the rotating angle of the adjusting screw can be clearly known by controlling the number of turns of rotation of the worm, the moving distance of the adjusting screw can be accurately controlled, and therefore high-precision adjustment is achieved.

The application discloses a single-photon laser radar coaxial light path stray light suppression method, belongs to the technical field of laser radar detection, and is used for stray light suppression and comprising the following steps: a main control module triggers a laser to emit linearly polarized pulse light beams; the linearly polarized pulse light beams are projected to an underwater target through a beam expander, a 45-degree open hole reflector and a two-dimensional scanning galvanometer; echoes are reflected to the 45-degree open hole reflector through the galvanometer; after converging through a focusing lens group and a narrow-band optical filter, the echoes penetrate a small aperture diaphragm; closed-loop attenuation control is performed on the echoes after penetration; and a two-dimensional depth map of the underwater detection target is obtained. Through the collection of light intensity voltage changes and the cooperation of an extreme value optimization algorithm, the motor is dynamically tracked and controlled to orthogonally intercept random flares, the water surface flare and internal stray light are suppressed to a very low level, the detection capability of the system for effective echoes is improved, and the stability of target depth information extraction and two-dimensional distance reconstruction is effectively improved.

The application relates to an exposure system for exposing a three-dimensional structure on a workpiece, the exposure system is sequentially provided with a laser for emitting a laser beam, a beam expander for zooming and expanding the spot of the laser beam, an aperture for limiting the laser beam, a galvanometer for deflecting the direction of the laser beam, and a field lens group for ensuring the vertical emission of the laser beam along the advancing direction of the laser beam, the galvanometer comprises a reflecting sheet for reflecting the laser beam, the reflecting sheet can be rotated to expand the range of the laser beam emission, the range of the laser beam emission is 3mm*3mm-15mm*15mm, the exposure system can form a three-dimensional structure on the workpiece under the action of the aperture, the reflecting sheet in the galvanometer can be rotated to expand the range of the laser beam emission, so that the workpiece and the exposure system can expose multiple units without relative movement, and the exposure rate and the workpiece processing efficiency are greatly improved.

This invention discloses a beam expander lens for laser scanning projection, relating to the field of laser projection display technology. It includes a first lens group, a second lens group, a third lens group, and a fourth lens group, arranged sequentially along the optical axis. These four lens groups together form the complete lens. The first, second, third, and fourth lens groups are arranged in a positive-negative-negative-negative optical power configuration. Through innovative optical architecture and optical power allocation, a large-angle beam expander function is achieved within a space of less than 35mm in total length, greatly saving internal space. By utilizing the chromatic aberration correction capability of the first lens group and the aberration correction capabilities of the second, third, and fourth lens groups, high-contrast imaging is achieved across the entire field of view and wavelength range, with concentrated dot matrix energy, meeting the requirements of high-resolution projection.

The invention relates to an experimental device for coupling optical acting force and suspension liquid optical nonlinear measurement, which comprises a laser control module and a microscopic imaging module, and the laser control module and the microscopic imaging module are respectively arranged in two orthogonal directions of a suspension liquid; the suspension liquid is placed in a transparent sample pool; the laser control module comprises a laser, a beam expander, a focusing lens, an imaging lens and a light beam analyzer which are arranged in sequence; the sample cell is positioned between the focusing lens and the imaging lens; the microscopic imaging module comprises a light source, a lighting lens, an imaging lens and an imaging camera which are arranged in sequence; the sample cell is located between the illumination lens and the imaging lens. Compared with the prior art, the device is provided with the laser control module, so that backward acting force for inducing particles in the suspension can be formed, and meanwhile, the focusing nonlinear effect in the suspension can be researched; and the microscopic imaging module can record moving images of particles in the suspension for subsequent analysis.

The utility model discloses a laser beam expander protective cover, which belongs to the technical field of laser beam expanders, and comprises a laser beam expander body, a cover body is sleeved outside the laser beam expander body, a pipe body is fixedly connected inside the cover body, a connecting rod is inserted inside the pipe body, one end of the connecting rod is fixedly connected with a circular plate, and the other end of the connecting rod is fixedly connected with a connecting rod. According to the utility model, the cover body is sleeved outside the laser beam expander body and is matched with the pluggable cover body, so that the lens can be effectively protected when the laser beam expander is not used, the lens is prevented from being damaged due to dust, sundries and contact with foreign matters, and the normal operation of a laser processing system is ensured; meanwhile, a circular plate with cleaning cotton is arranged in the cover body and is matched with a connecting rod and a rebound mechanism, so that the surface of the lens can be conveniently cleaned, a complicated structure does not need to be disassembled, the operation is simple, the cover body can be stably fixed on the beam expander body through a fastening bolt, the protection and cleaning functions are achieved, and the practicability is high. And the use safety and the maintenance convenience of the laser beam expander are improved.

This application discloses a carbon-free laser processing system and method for metal rings. The method comprises, arranged sequentially along the optical path: a laser for emitting a first femtosecond laser beam, the first femtosecond laser beam being linearly polarized light; a beam expander for expanding the first femtosecond laser beam; a polarization control element for adjusting the polarization state distribution of the expanded first femtosecond laser beam to form a second femtosecond laser beam; a beam adjustment module for changing the transmission direction of the second femtosecond laser beam and adjusting its angle to form a third femtosecond laser beam; and a focusing module for focusing the third femtosecond laser beam to obtain a focal spot, allowing the focal spot to directly act on the metal ring for processing. This improves the processing quality, efficiency, and product quality of the metal ring, while reducing the product loss rate during processing.

The invention provides a laser fuze emission beam-expanding optical lens in an extremely simple form, and the optical lens comprises an emission lens which is located at the rear end of the lens and is used for carrying out the small-angle compression shaping of a beam divergence angle of a meridian-direction Gaussian beam emitted by a laser; and the wave mirror is positioned at the front end of the lens and is used for carrying out large-angle beam expansion on the beam divergence angle of the Gaussian beam emitted by the laser in the sagittal direction and realizing uniform shaping of light spots. Strip-shaped distribution shaping is carried out on Gaussian beams of the laser through the extremely simple form of the two lenses, so that the light beam emergent view field in one direction, namely the meridian direction, is compressed to 1 degree, and the light beam emergent view field in the other vertical direction, namely the sagittal direction, is expanded to 90 degrees. By adopting the special element design of the cylindrical surface array, the uniform energy distribution of the whole strip-shaped light spot is realized, the target detection precision of the surface-air laser fuze in a large-range space region is greatly improved, and meanwhile, the extremely simple design is more beneficial to meeting the requirements of miniaturization and low cost.

The invention discloses a deep ultraviolet pneumatic heat management beam expanding lens system, and relates to the technical field of beam expanding lens, the deep ultraviolet pneumatic heat management beam expanding lens system comprises a lens barrel, a first lens frame and a second lens frame, a rack is provided with a reducing lens cavity used for accelerating flowing gas, the first lens frame is provided with a first lens, and the second lens is provided with a second lens. A first vent hole is formed in the side wall of the first lens frame, so that flowing gas forms a first gas curtain on the inner side of the first lens; the second lens frame is provided with a second lens, and a second vent hole is formed in the side wall of the second lens frame, so that flowing gas forms a second gas curtain on the inner side of the second lens; the air curtain can continuously purge the mirror surface, deposition and accumulation of pollutants on the mirror surface are effectively prevented and removed, clean cooling gas is accelerated through the variable-diameter mirror cavity, transient response is faster, and the problem that the temperature difference between the center and the edge of the lens is too large due to local cooling is solved; the two are integrated, the overall structure is simplified, and production and manufacturing are convenient.

The application provides a coaxial focusing system and mounting method and focusing method for laser precision machining, and the system comprises a projection imaging light path, a shooting taking light path and a laser focusing light path which are composed of a light source, a grating, a CCD, a half mirror, a lens, a full mirror, a half mirror, a laser system, a beam expander, a ceramic motor, an objective lens, a laser displacement sensor, a workpiece to be machined and a conjugate light path. The system is based on coaxial conjugate light path, combined with accurate measurement of the laser displacement sensor, overcomes the shortcomings of pure optical measurement and image comparison focusing method, realizes high-speed high-precision focusing and high-speed focus following function, and provides the best solution for laser machining of products with thickness deviation and surface deformation.

This invention discloses a laser beam identification device and method for identifying whether a test beam is a first laser beam or a second laser beam, wherein the spectral widths of the first and second laser beams are different. The laser beam identification device includes a beam expander, an aperture, and a detector. The beam expander allows the output beam formed after the test beam passes through to be incident on a first and a second slit in the aperture. The output light from the first and second slits interferes. The detector is located on the light-emitting side of the aperture and is used to detect the light intensity at at least two positions, which are different positions along the direction of the interference fringes. Based on the light intensity at these at least two positions, the detector determines whether the light field distribution at these positions is a fringe distribution or a uniform field distribution, thereby determining whether the test beam is the first or the second laser beam. This invention has low cost, relatively small size, and low power consumption.