729 results about "Beam expander" patented technology

The invention discloses an underwater single photon laser radar imaging method and system based on a gated SPAD array, and belongs to the field of photoelectric detection and image processing. Through the underwater single photon TG-SPAD array range gating imaging system, real-time intensity imaging and high-precision depth imaging of an underwater scene target are realized, and the three-dimensional target reconstruction precision can reach a millimeter level. The system comprises an onshore synchronous control and image processing module and an underwater laser radar module installed in a sealed waterproof shell. The underwater laser radar module comprises a pulse blue-green laser emission module, a single photon TG-SPAD array detection imaging module, and a multipath power supply and signal transmission module. The single-photon TG-SPAD array detection module has two modes of intensity imaging and gating imaging. The pulse blue-green laser transmitting module comprises a pulse blue-green laser and a beam expander. The multi-path power supply and signal transmission module comprises a multi-path power supply, a photoelectric composite watertight cable and a bidirectional optical transceiver. The system has the advantages of simple structure, high stability, low power consumption and high integration level.

The invention provides a transmitting-receiving coaxial laser radar optical system, and relates to the technical field of laser radars. The optical system comprises a transmitting assembly, a polarization splitting prism, a quarter-wave plate, a common beam expanding lens group, a micro-lens array, a common lens and a receiving assembly which are arranged in sequence. Laser emitted by the emitting assembly enters the polarization splitting prism, and at the moment, a light beam is linearly polarized light, can pass through the polarization splitting prism and then pass through the quarter-wave plate to reach the shared beam expanding lens group to be collimated and expanded, and finally is emitted for illumination through the micro-lens array and the shared lens; the emergent laser beam is irradiated to an object to return an optical signal, and the returned optical signal is returned to the polarization splitting prism along an original optical path and is reflected into the receiving assembly to be received and processed; according to the invention, the beam splitter prism, the beam expander group and the micro lens array are shared, and the shared lenses are the same and share the lens group, so that the purpose of saving the manufacturing cost of the laser radar is achieved; the method is suitable for automobile automatic driving, distance detection and the like.

The invention discloses a holographic sight based on a volume Bragg grating, and belongs to the field of holographic optics. The holographic sight comprises a sight housing, a semiconductor laser, a wave-locking element, a beam expander, an off-axis parabolic reflector and a holographic grating. The wave-locking element is a reflective volume Bragg grating, and the holographic grating is a transmissive volume Bragg grating. Both have excellent selectivity for the wavelength and incident angle of light. At the same time, both are made of photothermorefractive glass, which is less affected by the external temperature and can effectively reduce the deviation of the output wavelength, thereby reducing the deviation of the holographic grating mark image and increasing the accuracy and stability of the holographic sight. The photothermorefractive glass has a high refractive index modulation degree, which achieves a higher holographic diffraction efficiency, making the displayed holographic image brighter and more recognizable. In addition, the components of the beam expander and the off-axis parabolic reflector are used to shorten the optical path and reduce the overall structural size of the sight.

The invention relates to the technical field of wafer warpage and curvature detection, in particular to a wafer warpage and curvature detection system and a detection method thereof, and the detection system comprises a laser, a beam expander, a diaphragm, a beam splitter prism, a collimating mirror, a reference mirror, an imaging lens, a CCD and a computer, the light beam is reflected by the sample to be measured and then returns along the same path to interfere with the reference light so as to generate three groups of interference fringes, and the three groups of interference fringes pass through the imaging lens, the CCD and the computer and then are calculated so as to obtain the warping degree and the bending degree of the sample to be measured. According to the invention, the multi-surface interference fringe pattern of the double-sided polished sample to be measured is acquired by using the wavelength-adjustable Hunfizeau interferometer, and the warping degree and the bending degree of the sample to be measured are obtained through calculation, so that the problem of mapping errors caused by measuring the surface shape by using two interferometers or overturning the measured surface shape is solved; therefore, the detection steps of the warping degree and the bending degree of the wafer can be simplified, and the precision of the detection result is improved.

The invention provides a laser beam splitting multi-galvanometer parallel scanning processing system, which comprises a laser, a beam splitter group, a plurality of groups of collimation beam expanders, a plurality of groups of attenuators and a plurality of focusing scanning galvanometer systems, and is characterized in that the beam splitter group comprises at least one total reflection mirror and at least one beam splitter, and the axial leads of all lenses in the beam splitter group are parallel to one another; the beam splitter group is used for equally dividing a laser beam output by the laser into a plurality of parallel light beams with the same power, a light path where each parallel light beam is located is sequentially connected with a group of collimation beam expanders, a group of attenuators and a focusing scanning galvanometer system, and each focusing scanning galvanometer system is used for focusing each parallel light beam to a to-be-processed plane. According to the invention, the effect of multi-beam and multi-galvanometer parallel scanning processing is realized through beam splitting of a single laser, the scanning breadth is effectively expanded, the manufacturing efficiency is improved, the input power of each light path is independently controllable, and the equipment cost is greatly reduced.

The invention discloses a device and a method for low-thermal-damage laser stripping and cutting of transparent materials, the device comprises a laser, and a first half-wave plate, a linear polarizer, a beam expander, a second half-wave plate, a vortex wave plate and a processing objective lens which are sequentially arranged along the laser transmission direction, and emergent light of the processing objective lens enters a processing material; a machining material is adsorbed and fixed to the cooling suction cup, and the cooling suction cup is installed on the three-dimensional moving platform. Light subjected to polarization modulation is focused into a material through the objective lens to be modified, a complete modified layer is formed along with movement of the three-dimensional platform, the device and the method have the advantages of low thermal damage and high precision when being used for stripping and cutting, and material loss caused in the laser machining process can be reduced.

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.

The invention relates to the technical field of optics, and discloses a thermal lens effect testing system and method so as to improve compatibility and ensure measurement precision. The system comprises a first branch, a second branch and a third PBS, wherein the first branch and the second branch are input into a second PBS, the third PBS is positioned between a second output beam of the second PBS and a third beam expander, and a first beam quality analyzer for assisting in adjusting light spots of the two input branches is arranged on a first output beam of the second PBS; an emergent light beam of the third beam expanding lens enters a second light beam quality analyzer arranged on a second electric displacement platform through the focusing lens; a first electric displacement platform for placing a sample to be tested is arranged between the second PBS and the third PBS; and the second electric displacement platform is used for repositioning the focal point of the light beam under the assistance of the second light beam quality analyzer after the thermal lens effect of the sample to be detected on the first electric displacement platform is stable, so that the distance between the repositioned focal point and the initial focal point is determined as the focal shift amount.

The invention discloses a double-comb non-cooperative target ranging system based on single photon detection, which is characterized in that an optical pulse output by a first optical frequency comb is divided into two paths of light through a first beam splitter, the first path of light is combined with one of two paths of light divided by a second optical frequency comb through a second beam splitter, and the combined light is transmitted to a first nonlinear frequency up-conversion module; a sum frequency light pulse in the wave band of 780 nm is generated and detected by a base avalanche diode photoelectric detector, and then a time-dependent single photon counter is triggered to start counting; the second path of light is output to a beam expanding collimator through the circulator and irradiates a target to be measured through spatial propagation, the beam expanding collimator collects diffuse reflection light and returns the diffuse reflection light to a third port of the circulator along the original path, and the diffuse reflection light and the other path of light split by the second optical frequency comb through the second beam splitter are combined and transmitted to a second nonlinear frequency up-conversion module; the up-conversion light after sum frequency conversion passes through the optical filter group and then is recorded by a stop end of the single photon counting module, multi-cycle accumulative statistics is carried out by the time correlation single photon counter, and finally a photon counting waveform is reconstructed and the flight time difference of the to-be-measured target is calculated by the computer.

The invention relates to a Raman nondestructive testing system for cultural heritage based on a cooling device. Comprising a vacuum chamber, and the vacuum chamber is used for placing a sample and receiving Raman scattering signals generated by the light inlet module penetrating through the vacuum chamber, irradiating the surface of the cultural relic sample and exciting the sample; the cooling device module is connected with the vacuum chamber and is used for efficiently cooling the vacuum chamber and preventing the cultural relic sample from being damaged by a laser heat effect; the control and data processing module is used for monitoring and adjusting the laser power, the chamber pressure and the temperature of the sample table in real time, analyzing the collected Raman spectrum data and outputting a detection result; the laser energy density at the sample can be effectively reduced, and the cultural relic sample is prevented from being damaged due to strong light focusing irradiation; meanwhile, efficient collection of Raman signals in a large light spot range is achieved through the beam expander and the signal collection module, and the problem that the signal strength is weakened is solved.

The invention discloses a rear-mounted holographic focusing schlieren imaging method. The method comprises the following steps: after a laser emits a laser beam, the laser beam is divided into a main light source and holographic reference light; a main light source sequentially passes through a multi-stage beam expander, a soft light screen, a Fresnel lens and a source grating to obtain light beams with alternate brightness and darkness, and the light beams irradiate a flow field; the light beam penetrating through the flow field is focused by the focusing lens, an image of the source grating is formed at the knife edge grating through the focusing lens, and the light beam penetrating through the flow field is modulated by the knife edge grating, so that an image of the section of the flow field is formed behind the knife edge grating; the light beam modulated by the knife edge grid passes through the field lens and is recorded together with the holographic reference light to obtain a holographic focusing schlieren map; performing digital reconstruction to obtain three-dimensional flow field position information; and calculating the three-dimensional density gradient and the density value of the flow field based on the imaging principle of focusing schlieren. The invention further discloses a rear-mounted holographic focusing schlieren imaging system. According to the method and the system, the ultra-high-speed flow field can be measured, and the requirement of an ultra-high-speed aircraft test on fine quantitative measurement of the three-dimensional flow field is met.

An apparatus for performing laser cutting and collection of a target micro-region of a tissue section on a blade. The apparatus comprises a carrier stage, a blade, a laser cutting system, a control module and a collector, wherein the laser cutting system comprises a laser device, a beam expander, a galvanometer scanner and an objective lens; and by means of adjusting a scanning angle θ of the galvanometer scanner and combining same with the objective lens, a scanned laser is focused to realize the cutting of a target micro-region on a tissue section and the ejection of the target micro-region. Laser microdissection is combined with mechanical sectioning, and non-contact collection of a specific micro-region of a tissue section placed on an inclined blade is achieved under the action of laser edge ejection combined with a dielectrophoretic force, such that the integrity of the morphology of a sample throughout an acquisition process is ensured, three-dimensional positional information of a target cell or cell population is accurately reserved, the cutting efficiency is improved, and non-contact cutting can also be realized to prevent the sample from being contaminated.

The invention relates to the technical field of optical measurement, and discloses a multimode fiber spatial coherence experimental analysis system and method.The system comprises an LED light source arranged in front of the front end face of a sapphire fiber, and an aperture diaphragm arranged behind the rear end face of the sapphire fiber; the beam expander, the collimating mirror, the beam splitter, the compensation plate and the second right-angle reflector are sequentially arranged behind the aperture diaphragm, the first right-angle reflector is arranged above the beam splitter, the plane reflector is arranged below the beam splitter, the focusing lens is arranged behind the plane reflector, and the photoelectric detector is arranged behind the focusing lens. According to the invention, phase imbalance caused by arm length difference of interference arms can be eliminated, the definition of interference fringes is improved, and the accuracy of a measurement result is enhanced.

The invention discloses a guided-mode resonance refractive index detection device and method based on a longitudinal gradient grating structure, and belongs to the technical field of optical sensing and imaging spectrum detection, the guided-mode resonance refractive index detection device comprises a light source, an optical isolator, a polarization controller, a collimation beam expander, a guided-mode resonance sensing chip, an image detector and a signal processing unit which are connected in sequence; the guided-mode resonance sensing chip is of a transmission type structure, the top of the guided-mode resonance sensing chip is provided with a strip-shaped nano structure which is consistent in period but longitudinally gradually changed, and an image detector is arranged below the guided-mode resonance sensing chip and used for receiving a transmission light signal penetrating through the guided-mode resonance sensing chip, generating a transmission light image and transmitting the transmission light image to the signal processing unit; and the signal processing unit is used for analyzing the transmitted light image and inverting the refractive index of the medium to be measured according to the structure mapping model. According to the invention, the longitudinal structure gradual change characteristic is introduced into the guided-mode resonance chip, so that the spatial distribution control of the monochromatic light resonance response position is realized, and finally the imaging refractive index sensing without an optical splitter is realized.

Disclosed is a linear array scanning Brillouin scattering elastic imaging device. In the device, a signal generating system consists of a narrow linewidth continuous wave laser, a half-wave plate, a beam expander, a Y-direction scanning galvanometer, a microlens array, a pinhole array filter, a first plano-convex lens, a polarization beam splitter, a quarter-wave plate and a microscope objective. A signal receiving system consists of a microscope objective, a quarter-wave plate, a polarization beam splitter and an eight-channel optical collimator array. Each channel of an eight-channel spectrometer consists of an optical collimator, a convex lens, a scanning Fabry-Perot interferometer, a photomultiplier tube and an eight-channel photon collection card.

According to the system for machining the micro-hemispherical harmonic oscillator based on the carbon dioxide laser, the glass substrate is heated and softened through the carbon dioxide laser, and the energy utilization rate is higher. The horizontal displacement table drives the forming mold to move until the center coincides with the center of a laser spot, so that the positioning accuracy of a processing area is ensured; the diameter of the laser beam is adjusted through the beam expander, it is guaranteed that the diameter of a laser spot is larger than that of the to-be-machined micro-hemispherical harmonic oscillator, and the accuracy of a machining area is guaranteed. The forming mold and the glass substrate are driven to rotate through the rotating table, so that heat distribution of a processing area is relatively balanced, the size deviation of the micro-hemispherical harmonic oscillator caused by unbalanced heat distribution is avoided, and the processing quality of the micro-hemispherical harmonic oscillator is improved. Compared with a traditional method for softening the glass substrate through flame heating, all technological parameters in the machining process can be accurately controlled, the method has the advantages of being easy to operate and high in automation integration degree, and the micro-hemispherical harmonic oscillators high in forming precision and good in batch consistency can be machined.

The invention discloses a high-resolution fast compressed sensing single photon array imaging system and method, and relates to the technical field of weak light imaging and computational imaging. The system comprises an imaging light source, an optical attenuator, a light beam expander, a to-be-detected target, a signal generator, a spatial light modulator, a single photon detection array, a counting storage module and a data processing module. Wherein the imaging light source is used for emitting a light beam to illuminate a target scene to be imaged; the optical attenuator, the light beam expander, the target to be measured and the spatial light modulator are sequentially arranged on a transmission light path of a light beam; the signal generator is respectively connected with the spatial light modulator and the single photon detection array; and the single photon detection array, the counting storage module and the data processing module are connected in sequence. According to the invention, the problem that the measurement mask is difficult to manufacture and store due to overlarge reconstruction resolution can be solved, and the imaging resolution and the imaging rate are improved.

The invention provides rotating mirror laser thinning equipment. The rotating mirror laser thinning equipment comprises a feeding conveying line; a discharging conveying line; a laser processing assembly; the laser processing assembly comprises a laser, a first reflector, a diaphragm, a second reflector, a beam expander, a laser beam shaper, a dynamic rotating mirror and a field lens, wherein the first reflector, the diaphragm, the second reflector, the beam expander, the laser beam shaper, the dynamic rotating mirror and the field lens are arranged in the laser beam emitting direction. The first transfer assembly is located between the first transfer station and the second transfer station; and a second transfer assembly. The device is high in automation degree, high in working efficiency and good in laser thinning effect, and the deformation problem and the resonance problem caused by thermal expansion of the battery piece in the machining process are effectively avoided.

A laser irradiation apparatus includes a laser beam generator that generates a first laser beam, a beam expander that expands the first laser beam and outputs the expanded first laser beam as a second laser beam, a beam splitter that splits the second laser beam into third laser beams and outputs the third laser beams, and a beam condenser that condenses the third laser beams and outputs condensed third laser beams. The beam expander includes a first lens having a first focal length and a second lens having a second focal length. The first lens is disposed between the laser beam generator and the second lens, the second lens is disposed between the first lens and the beam splitter, and the laser beam generator is spaced apart from the first lens by the first focal length.

The invention discloses a laser cavitation diagnosis device and method based on double-frame delay synchronous phase shift. The device comprises an excitation module and a detection module. The excitation module comprises a first laser, a first 1 / 2 wave plate, a polarization splitting prism, a spectroscope, an energy meter, a convex lens and a water tank; the detection module comprises a second laser, a beam expanding lens group, a second 1 / 2 wave plate, a second polarization splitting prism, a third 1 / 2 wave plate, a first reflector, a second reflector, a fourth 1 / 2 wave plate, a third polarization splitting prism, a third reflector, a fourth polarization splitting prism, a first 1 / 4 wave plate, a first imaging lens, a first micro-polarization camera, a second 1 / 4 wave plate and a second imaging lens; and a second micro-polarization camera. According to the invention, a double-frame delay method is introduced into traditional synchronous phase-shifting interference, the defects of the existing cavitation detection technology are overcome, and instantaneous phase change observation in a single cavitation pulsation period is realized.

The invention relates to a dual-wavelength vortex light interference displacement measurement system and a dual-wavelength vortex light interference displacement measurement method for compensating installation and adjustment errors through image recognition, and belongs to the technical field of optical precision measurement of precision measurement. Comprising a laser light source A, a beam expander A, a collimating mirror A, a vortex wave plate A, a laser light source B, a beam expander B, a collimating mirror B, a vortex wave plate B, a beam splitter prism A, a reflector A, a reflector B, a beam splitter prism B, a reflector C, a displacement table and a camera. An image recognition method is used for processing a dual-wavelength vortex light interferogram, displacement calculation is carried out according to the overall intensity change distribution of the interferogram, and different from traditional angle recognition extraction, the method is used for solving the problem that a measurement result is affected by system errors existing in a measurement system. The traditional angle identification precision is reduced due to interference pattern distortion, so that the measurement precision is influenced, the error influence is effectively reduced, the accuracy of the measurement result is ensured, and the micro-displacement measurement method is novel, effective, high in precision and large in range.

The invention discloses a PVG preparation method and device based on a vector light field generated by a spatial light modulator. The device comprises an illumination system, a phase design system and an exposure system. The lighting system is mainly formed by assembling a laser and a beam expander, and the phase design system is composed of two spatial light modulators (SLMs) which are named as a phase design system 1 and a phase design system 2 respectively. Wherein the lighting system and the phase design system 1 are sequenced on a center line, and the phase design system 2 and the exposure imaging system work on a vertical center line. According to the method, the flexibility of manufacturing the holographic waveguide of the polarization body is greatly improved, phase regulation and control are carried out through the programmable electric control element SLM to control the transverse period, and experimental errors caused by manual adjustment of a reflector in a traditional mode are reduced; meanwhile, the method is different from a traditional interference exposure method, and the whole system has high robustness; in addition, compared with a separated interference light path, one beam expander is used, and the problem of light beam consistency in the beam expanding process is avoided.

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 relates to the endoscope technology, and discloses a lighting system of a medical endoscope. Comprising a white light source, a light guide rod, a first collimating lens, a second collimating lens, a first dichroscope, a first focusing lens, a second focusing lens, an optical filter, a first laser source, a first beam expanding lens, a third collimating lens, a second dichroscope, a second laser source, a second beam expanding lens and a fourth collimating lens. The first collimating lens, the second collimating lens, the third collimating lens, the fourth collimating lens, the first focusing lens, the second focusing lens, the first beam expanding lens and the second beam expanding lens are all spherical lenses. The invention further discloses a medical endoscope. The white light and the two different lasers are correspondingly transmitted and reflected respectively, so that the illumination system of the medical endoscope meeting the illumination of the white light and the two lasers can be prepared by using a spherical lens, and the manufacturing cost is reduced.

The invention relates to the technical field of laser processing, in particular to a fully-sealed adjustable laser beam expander which comprises a sealing cover, an air inlet pipe is communicated with the peripheral wall of the sealing cover, a plurality of air outlet pipes are communicated with the peripheral wall of the sealing cover, and two sliding rods are welded to the side wall of an inner cavity of the sealing cover. Sliding blocks are arranged on the peripheral walls of the two sliding rods in a sliding mode, a beam expander body is welded between the two sliding blocks, a plurality of limiting rods are welded to the annular wall of an inner cavity of the sealing cover and circumferentially distributed on the annular wall of the inner cavity of the sealing cover at equal intervals, and telescopic air bags are arranged between the limiting rods; a sealing rubber strip adheres to the side wall of the sealing cover, a plurality of first air outlet holes are formed in the peripheral wall of the sealing rubber strip, the arranged telescopic air bag expands after absorbing heat, the expanded telescopic air bag can abut against the contact face of the sealing cover and the laser cutting machine, and therefore the sealing effect of the contact face of the sealing cover and the laser cutting machine is enhanced.

The present application relates to the field of laser processing technology, and in particular to a water-cooled beam expander with adjustable divergence angle, the water-cooled beam expander with adjustable divergence angle comprising a first water-cooled lens barrel and a second water-cooled lens barrel, the first water-cooled lens barrel comprising a first lens barrel housing, a first lens being arranged in the first lens barrel housing, the second water-cooled lens barrel comprising a second lens barrel housing, a second lens being arranged in the second lens barrel housing, a first thread being arranged at one end of the first lens barrel housing close to the second lens barrel housing, a second thread being arranged at one end of the second lens barrel housing close to the first lens barrel housing, the first lens barrel housing and the second lens barrel housing being threadedly assembled through the first thread and the second thread. The distance between the first lens and the second lens is changed by thread adjustment, so as to achieve adjustment of the divergence angle of the light beam, thus solving the problem that the divergence angle of the conventional water-cooled beam expander is generally unable to be adjusted, and the adjustment structure of a very small portion of the water-cooled beam expanders that can adjust the divergence angle is relatively complex, resulting in high cost.

The invention relates to the field of power electronic devices, in particular to an all-fiber isolation SiC MOSFET grid driver suitable for ultrahigh voltage and application, the all-fiber isolation SiC MOSFET grid driver comprises a transmitting side, a fiber group and a receiving side which are connected in sequence, the transmitting side comprises a constant-current laser driver, a semiconductor fiber coupling laser, a fiber coupler of an FC connector, a high-speed light emitter driver and a light emitter, and the receiving side comprises a high-speed light emitter driver and a high-speed light emitter. The optical fiber group comprises a quartz power optical fiber and a plastic signal optical fiber of an FC (Fiber Channel) joint, and the receiving side comprises a beam expander, a laser battery, a 5V boost IC (Integrated Circuit), a 25V boost IC, an optical receiver, a non-isolated driving IC and a push-pull current expanding circuit. And common-mode interference caused by a coupling capacitor is eliminated. Meanwhile, the efficiency of a device is reasonably calculated, and a high-efficiency boost IC is matched, so that the driving power of 0.8 W is realized, and a 6.5 kV 25A high-voltage SiC MOSFET module can be driven to work at the switching frequency of more than 100kHz.

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 an underground fluid detection device integrating acoustic signals and a laser-induced breakdown spectroscopy technology. The underground fluid detection device further comprises a laser spectrum acquisition device, an acoustic signal acquisition device and a fusion signal analysis and correction module, the laser spectrum acquisition device is arranged above the conveying pipeline and comprises a solid laser, a beam expander, a reflector, a focusing lens and an optical fiber probe; the acoustic signal acquisition device is arranged close to one end of a water inlet of the drainage pipeline, and the fusion signal analysis and correction module is connected with the laser spectrum acquisition device and the acoustic signal acquisition device; the fusion signal analysis and correction module comprises a processor, the processor is connected with the oscilloscope, compared with the prior art, the LIBS technology and the acoustic detection technology are fused, the characteristics of the underground fluid can be known more comprehensively, and the efficiency and accuracy of underground fluid detection are greatly 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.