253 results about "He ne laser" patented technology

The invention provides a large diameter aspheric measuring device based on ultra-precision rotary scan and a method, belongs to the macroscopic measuring technology. The device comprises an ultra-precision air flotation turntable, a precision angle and angle measuring system, an ultra-precision linear air flotation guide, a length-measuring device and a gradient measurement system. The gradient measurement system comprises a linear polarization He-Ne laser or a semiconductor laser, a diffraction element, a scanning head and an image receiving unit. The linear polarization He-Ne laser or the semiconductor laser and the image receiving unit are separately fixed on the two sides of the base beam. The scanning head is fixed on the ultra-precision linear air flotation guide. The scanning head comprises a radial gradient measurement sub-scanning head and a tangential gradient measurement sub-scanning head, both of which comprise an error compensation light path. The working platforms of the two sub-scanning heads are orthogonal to each other. The invention discloses a large diameter aspheric measuring method based on ultra-precision rotary scan.

An apparatus and method for recording spatially dependent intensity patterns of polarized light that is diffusely backscattered from highly scattering media are described. These intensity patterns can be used to differentiate different turbid media, such as polystyrene-sphere and biological-cell suspensions. Polarized light from a He-Ne laser ( lambda =543 nm) is focused onto the surface of the scattering medium, and a surface area of approximately 4x4 cm centered on the light input point is imaged through polarization analysis optics onto a CCD camera. A variety of intensity patterns may be observed by varying the polarization state of the incident laser light and changing the analyzer configuration to detect different polarization components of the backscattered light. Experimental results for polystyrene-sphere and Intralipid suspensions demonstrate that the radial and azimuthal variations of the observed pattern depend on the concentration, size, and anisotropy factor, g, of the particles constituting the scattering medium. Measurements performed on biological cell suspensions show that intensity patterns can be used to differentiate between suspensions of cancerous and non-cancerous cells. Introduction of the Mueller-matrix for diffusely backscattered light, permits the selection of a subset of measurements which comprehensively describes the optical properties of backscattering media.

The invention discloses a multi-frequency synchronization phase laser ranging device and a method based on dual-acousto-optic shift frequency, relates to the technical field of laser ranging, and mainly relates to a phase laser ranging technology, solving the problem that a device and a method which can achieve both of the synchronism and stability of multiple measuring tapes are in lack in the existing phase laser ranging technology. The multi-frequency synchronization phase laser ranging device based on dual-acousto-optic shift frequency comprises a dual-longitudinal-mode stable frequency He-Ne laser, a multi-measuring-tape generating unit, a bundle expanding and collimating lens set, a light path and circuit measuring unit and a control box unit. The multi-frequency synchronization phase laser ranging method based on dual-acousto-optic comprises the following concrete steps: step one, switching on the dual-longitudinal-mode stable frequency He-Ne laser; step two, taking one beam oflaser as a reference laser beam, and taking the other beam of laser as a measurement laser; step three, taking (f'+f2)-(f+f1) as the accurate measurement tape frequency, and taking a low-frequency electric signal f1-f2 as the rough measurement tape frequency; and step four, moving a measuring cone prism to the target end. The device and the method are used for phase laser ranging.

The invention relates to a high-precision multi-frequency phase-synchronized laser distance measurement device and method, relates to the technical filed of laser measurement, and mainly relates to a phase laser distance measurement technology. In the invention, the problem that a device and a method capable of realizing both synchronization and stability of multiple measurement gauges are in shortage in the phase laser distance measurement technology is solved. The high-precision multi-frequency phase-synchronized laser distance measurement device comprises a dual-longitudinal-mode frequencystabilization He-Ne laser, a multi measurement gauge generation unit, a beam expanding collimating mirror group, a measuring light path and circuit unit and a control casing unit. The high-precision multi-frequency phase-synchronized laser distance measurement method specifically comprises the following steps of: 1, starting the dual-longitudinal-mode frequency stabilization He-Ne laser; 2, taking one beam of laser as a reference laser beam and the other beam as a measurement laser beam; 3, taking [(f'+f2)-(f+f1)] as the frequency of an accurate measurement gauge and taking (f1-f2) as the frequency of a coarse measurement gauge; 4, moving a measurement corner-cube prism to a target end; 5, obtaining a phase difference phi p; 6, obtaining a phase difference phi c; and 7, obtaining the distance. Thus, the method and device disclosed by the invention can be used for laser distance measurement.

The invention discloses a supersonic speed flow field detecting system based on H-S wave front sensor, which is formed by a He-Ne laser, a light beam expander, a supersonic speed wind tunnel generating the flow field, a detected model, an H-S wave front sensor, a picture collecting card and a data collect processing computer. Wherein, the invention can easily attain the wave phase distribution of laser that has passed the flow field and the light beam aberration character, as wave three-dimensional distribution, PV valve, RMS, and Zernike aberration parameters, to attain the light beam remote field distribution, light beam mass center excursion character, encircled energy, etc, while said invention is based on Hageman-shark wave front sensor to effectively display the building, stabilizing and completing of said flow field. And the inventive data analyze processing software has better real-time property to apply flow field dynamic character detection.

The invention discloses a two-dimensional flow velocity field measurement method and device of an interlaced scanning CCD (charge coupled device). Trace particles are implanted into a to-be-measured flowing object (gas or liquid) and can move together with fluid due to viscidity. For the measurement device, a continuously light-emitting gas laser (such as He-Ne laser) is used as a light source, and a common interlaced scanning CCD sensor is used as an image detector. A one-frame flowing image including the trace particles is captured transiently, then the flowing image is processed by means of filtering and binaryzation, the interlacedly scanned one-frame image is separated into two images according to odd-even lines, a cross-correlation technology is adopted to perform computation processing, and accordingly a two-dimensional flow velocity field can be obtained. PIV (particle image velocimetry) full-field velocity measurement can be achieved without a high-power laser, a high-resolution CCD and a complex synchronizer; and the two-dimensional flow velocity field measurement method and device is simple in equipment, low in cost and applicable to flow field measurement on different occasions.

A high-precision splitting sub-mirror relative inclining error photoelectric detection system comprises the following components: a HE-NE laser, a spatial filter, a collimator objective, a cubic beam splitting prism, a detected splitting sub-mirror set, a reference mirror, a light path beam-contracting system, a CCD planar array photoelectric detector and a data processing system. The HE-NE laser, the spatial filter and the collimator objective form a light source arm part of the detection system together. The detected splitting sub-mirror set forms a measuring arm part of the detection system. The reference reflecting mirror forms a reference arm part of the detection system. The relative inclining error information which is detected by the detecting arm and is between the splitting sub-mirrors is detected by the CCD planar array photoelectric detector. The detected interference image information is processed by a data processing system for real-time detecting the inclining error between the splitting sub-mirrors. The invention can execute a real-time high-precision detection. The effect of the relative inclining error between the sub-mirrors to the imagining quality of the telescope can be reduced with a large scale and the invention has the advantage of simple structure.

The invention discloses a CCD chip modulation transfer function test device and method. The CCD chip modulation transfer function test device mainly comprises a He-Ne laser, an adjustable attenuator, a beam expander, a pinhole filter, a diaphragm, a collimating lens, an improved Michelson interferometer, a camera obscura, an image capture card and a PC data processing system, wherein the He-Ne laser, the adjustable attenuator, the beam expander, the pinhole filter, the diaphragm and the collimating lens are arranged on the incident light path of the improved Michelson interferometer in sequence, and the optical axis of the He-Ne laser, the optical axis of the adjustable attenuator, the optical axis of the beam expander, the optical axis of the pinhole filter, the optical axis of the diaphragm and the optical axis of the collimating lens are arranged on the same straight line, the camera obscura is arranged on the emergent light path of the improved Michelson interferometer, and the PC data processing system is connected with the image capture card which is arranged in the camera obscura and is connected with a CCD. Incident light is processed through the CCD chip modulation transfer function test device to form parallel light, and goes out in a sine interference fringe mode through the improved Michelson interferometer, a sine interference fringe pattern is used as a target, imaging is carried out through the CCD, and a modulation transfer function of the CCD is obtained through a test by using the method of the ratio between the sine interference fringe contrast and the image contrast.

The invention provides a detection system and a method for detecting scraper planeness by using a wedge interfere principle. The scraper planeness detection system comprises a light source (laser) system, a beam shaping system and a sensing system, wherein the light source system is a monochrome He-Ne laser, the beam shaping system is composed of an aperture and a half transparent and half reflecting mirror, and the sensing system consists of a standard template and a CCD detection device. The detection system can detect the planeness of the scraper working surface in a rapid, accurate and non-wear manner.

The invention relates to a cross-polarization laser feedback grating interferometer of a phase modulation type, and a measurement method thereof. The measurement principle is based on the grating diffraction, optical Doppler effect, Lamb semi-classical theory and time-domain orthogonal demodulation principle. The orthogonally polarized light outputted by a birefringent dual-frequency helium-neon laser is perpendicularly incident to a polarization beam splitting prism and is divided into two linearly polarized light beams in different polarization directions. The two polarized light beams respectively pass through two different electrooptical modulators and then are respectively reflected by a reflector at a + / -1-order Littrow incidence angle to a reflection-type diffraction grating. The diffracted light returns to the laser cavity along the respective incident light, and performs self-mixing interference with the light in the cavity. The backward output light of the laser passes through a polarizer and then only the single-mode light is retained and accepted by a photodetector. An output signal of the photodetector is outputted to a data processing module for data processing, and the two-dimensional displacement of a target to be measured is obtained. The grating interferometer has the advantages of simple structure, large measuring range and high measurement resolution.

The invention discloses an optical system generating screw type Bessel beams and a generating method. The optical system is composed of a He-Ne laser device, a polarizer, a first beam expander, a binary amplitude grating, a second beam expander, an aperture diaphragm, a liquid crystal spatial light modulator, an axicon and a CCD camera. Gauss beams emitted from the He-Ne laser device are converted into 0-degree linearly polarized light after passing through the polarizer with a 0-degree polarizing direction, beam expanding is carried out on the 0-degree linearly polarized light through the first beam expander, the 0-degree linearly polarized light is vertically emitted into the binary amplitude grating, generated diffracted light passes through the second beam expander, the diffraction angles of all diffraction orders of the diffracted light are enlarged, single-ring Laguerre-Guss beams are obtained through the aperture diaphragm and are sent to the liquid crystal spatial light modulator, the Bessel beams which are off an axis and are transmitted around the axis in a screw mode are generated by passing through the axicon, and the Bessel beams are irradiated to the CCD camera to obtain light distribution. The optical system generating the screw type Bessel beams and the generating method achieve generation of the Bessel beams which are off the optical axis and are transmitted around the optical axis in the screw mode.

The invention relates to a device for using intracavity self-adaptive optical technique to improve the solid laser beam quality which is formed by a He-Ne laser, a variable density fading disk, a beam-amplifying system, a distorting lens, a solid laser yield medium, a matching beam-amplifying concave mirror, a beam splitter, an output coupling mirror, a Hageman wave front sensor, a power meter, a high pressure amplifier, a high speed processor and a host computer, wherein the He-Ne laser sent light beacon is leaded into the solid laser yield medium by the concave mirror and is divided into two paths of signal by the beam splitter, one path uses the output coupling mirror to output the laser beam of the solid laser beam; the other path uses the Hageman wave front sensor to real-time probe the intracavity image differential information and uses the high speed processor to process it and obtains the corresponding voltage control signal; it adds the voltage to the deformation driver so that it can compensate the intracavity image difference of the solid laser.

The present invention belongs to the field of laser measurement technology, and features that 632.8 nm He-Ne laser and outer high reflectivity reflector constitute one non-collimated multiple laser feedback system. The outer reflector is fixed onto the tested object, and when the tested object is shifted, the laser strength fluctuation frequency may reach several to decades times that of the traditional feedback mode to result in high order frequency multiplying effect in laser strength fluctuation. The laser strength fluctuation period corresponds to nanometer level change in the distance between the outer reflector and the laser, so that measuring the period number of the laser strength variation can obtain the displacement of the measured object. When the object changes its moving direction, the laser polarization state jumps between two orthogonal directions and this may be used in judging the moving direction of the object.

The invention relates to a superposition state vortex light-based object rotation direction detecting device. The main components of the device include a He-Ne laser, a polarizer, a beam splitting prism, a spatial light modulator, a 4f filtering system, a plane mirror, a photoelectric detector and a micro oscilloscope. Laser generated by the laser is transmitted through the polarizer and then irradiates the spatial light modulator; the spatial light modulator is loaded with a superposition state beam hologram of which topological charges have opposite signs and have unequal values, so as to generate superposition state vortex light; the 4f filtering system screens out first-order diffracted light, and the first-order diffracted light irradiates a rotating object, and the photoelectric detector receives scattered light and performs spectrum analysis so as to obtain a frequency shift value; a rotation speed is added to the hologram, and then, signal acquisition is performed; and two frequency shift values obtained at two different times can be compared with each other, so that the rotation speed and rotation direction information of the object can be obtained. The device is simple instructure and can fully obtain various kinds of information related to the rotation of the object.

The invention belongs to the technical field of optics, and particularly relates to a spatial phase shift dynamic interferometer based on a liquid crystal spatial light modulator and application of the spatial phase shift dynamic interferometer. The spatial phase shift dynamic interferometer based on the liquid crystal spatial light modulator comprises a He-Ne laser, a first pinhole filtering, a first collimation and beam expanding system, a lambda / 2 wave plate, a polarizing beamsplitting prism, a first lambda / 4 wave plate, a second collimation and beam expanding system, a second pinhole filtering, a polarizing film, the liquid crystal spatial light modulator, a second lambda / 4 wave plate, a standard spherical mirror, a measured mirror, a polarization analyzer, an imaging system, a third pinhole filtering and an optical detector, dynamic testing of an aspheric surface member and a free-form surface member is realized through coded modulation of SLM, the SLM is used for replacing a tinypolarization phase shift array to realize spatial phase modulation, the adjustment is simple, the tiny polarization phase shift array is not required, and the difficulty is greatly reduced. Accordingto the spatial phase shift dynamic interferometer based on the liquid crystal spatial light modulator and application of the spatial phase shift dynamic interferometer, the function of real-time dynamic display is achieved, low energy consumption, easy control and high speed are achieved, the spatial resolution ratio is easier to improve, and high-precision measurement is realized.

The invention discloses a frequency-modulation continuous-wave laser distance measuring device of an integrated reference optical-circuit stabilization system. Distance measuring baselines of currentfrequency-modulation continuous-wave laser distance measuring systems are easily influenced by external vibration, and then the distance measuring accuracy is influenced. The frequency-modulation continuous-wave laser distance measuring device of the integrated reference optical-circuit stabilization system includes an external-cavity tunable laser, a measurement interference system, a helium-neonlaser and an auxiliary interference system; the external-cavity tunable laser generates continuous lasers of 1540 nm-1550 nm; the helium-neon laser generates single-mode lasers of 632 nm; the measurement interference system includes a second coupler, a first circulator, a first collimating lens, a first photoelectric detector and a third coupler; a feedback control system for optical-path-difference compensation is arranged in the auxiliary interference system and includes an acousto-optic modulation device, a frequency-modulation signal source, a phase detector, a photoelectric detector, a piezoelectric micro platform, a piezoelectric controller, a servo controller and a plane mirror. The frequency-modulation continuous-wave laser distance measuring device of the integrated reference optical-circuit stabilization system is used for eliminating the influence that the lengths of delay optical fibers change due to the external vibration, and therefore the distance measuring accuracy isimproved.

The invention relates to a vortex light-based rotating object rotary shaft tilt angle detection device. The device mainly comprises a He-Ne laser, a polarizing plate, a lens group, a polarization beamsplitting prism, a space light modulator, a 4f filter system, a plano-convex lens, a photoelectric detector, and a mini oscillometer. First, the laser generates Gaussian beam, after being collimated,the beam irradiates the space light modulator loaded with a specific hologram so as to prepare vortex light in overlaid state; then, the vortex light irradiates the center of the rotary shaft of a rotating object, after the vortex light is scattered by the object, scattered light is collected by the convex lens; finally, the photoelectric detector detects strength change of scattered beam and transmits a signal to the oscillometer, the oscillometer performs Fourier transformation, and a tile angle of the rotary shaft of the object relative to a beam incident direction can be determined according to spectrum bandwidth information. The device has a simple structure, can work effectively even in extreme conditions.

The invention relates to an object steering detection device based on vortex light rotation Doppler effect. The device mainly comprises a vortex light preparation part and scattered light signal detection part. The vortex light preparation part mainly comprises an He-Ne laser, a polaroid, a lens group, a spatial light modulator and a plane mirror, and the scattered light signal detection part mainly comprises a combination imaging telescope, a multi-mode optical fiber, a photoelectric detector and a micro oscilloscope. Firstly, a Gaussian beam is generated by a laser, and a spatial light modulator loaded with a specific hologram is irradiated and loaded after being collimated to prepare vortex light; secondly, the vortex light transmission rotating speed is omega d, and then is irradiatedon a rotating object, and after the object is scattered, scattered light is collected through the convex lens group, beat-frequency coupling is realized under the action of the beam splitter prism andthe original vortex light; and finally, the intensity change of the coupling light beam is detected by utilizing the photoelectric detection and transmitting the signal to the oscilloscope, Fourier transformation is carried out on the oscilloscope, and object steering can be judged according to the frequency spectrum information. The device is simple in structure and can still work effectively under various extreme conditions.

The invention relates to a light feedback telemeter for a double frequency He-Ne laser, belonging to the technical field of laser measurement. The telemeter comprises the double frequency He-Ne laser, an external cavity of laser feedback, a measurement circuit and a data processing system, wherein, the He-Ne laser comprises a gain tube, an antireflective window plate fixed on one end of the gain tube and a resonator; the resonator comprises a reflecting mirror of a first internal cavity fixed on the other end of the gain tube, a reflecting mirror of a second internal cavity fixed on the other end of the antireflective window plate, quartz crystal and a first piezoceramics. In the course of measuring, a second piezoceramics pushes the reflecting mirror of the external cavity of laser feedback to move from left to right along the laser axes so as to produce two lines of cross-polarized laser feedback signals and a phase difference exists between the two lines of cross-polarized laser feedback signals in direct proportion to the length of feedback external cavity. The telemeter is characterized by simple and compact structure as well as high performance.

The invention relates to a material rheological model analyzer. The analyzer comprises a sample room arranged in an environment temperature control box, a test material, a slice and a thermistor are arranged in the sample room; the slice is connected with a steel band, the steel band traverses through a guide wheel and is connected with an upper metal block in a magnetorheological fluid, and a lower metal block in the magnetorheological fluid is sequentially connected with a tension sensor, a miniature motor, a digital analog converter and a computer through the steel band; the steel band between the slice and the guide wheel is provided with a balancing counterweight, and the steel band between the guide wheel and the upper metal block is provided with a light attenuator; and a He-Ne laser is arranged under the guide wheel, a laser signal emitted by the He-N3 laser goes through the light attenuator and then is received by a CCD charge coupler, and the CCD charge coupler is sequentially connected with a signal amplifier, the digital analog converter and the computer. The invention also discloses a material rheological model establishing method. The material rheological model is established to predicate the rheological characteristics of a material under different conditions.

The invention discloses a method for coherently superposing and synthesizing multiple Airy beams to obtain high-energy bottle beams. A system comprises a He-Ne laser device, a collimating beam expanding lens, a reflective spatial light modulator, a control computer, a Fourier lens, a microscope objective lens and a CCD (charge coupled device) receiver which are sequentially connected with one anther. The method includes that a laser beam which is in Gaussian distribution is emitted by the laser device and is transmitted to the reflective spatial light modulator after being subjected to collimation and beam expansion, a special phase graph is loaded on the spatial light modulator and is a light intensity pattern, interference of ideal multiple Airy beams and plane beams is simulated by the computer to obtain the light intensity pattern, and the special phase graph is inputted into the spatial light modulator under the control of the computer; beams which are reflected after phases are modulated are further subjected to Fourier transformation by the aid of the Fourier lens, so that the high-energy bottle beams can be generated, can be amplified by the microscope objective lens and then are received by a CCD behind the microscope objective lens. The method has the advantage that the sizes of light bottles can be flexibly controlled.

The invention discloses a device and a method for measuring the size and roundness of a tiny round hole at the same time. The device comprises a He-Ne laser device, a measured round hole, a clamp device, a frosted glass receiving screen with a mark, an information acquisition device and an information processing device. The measurement of the device is based on the laser Fraunhofer diffraction measurement principle, the frosted glass with a special mark is placed in a diffraction field as a diffraction pattern receiving screen, an area array CCD (charge coupled device) acquires the diffraction pattern containing the special mark on the receiving screen, and the specially-developed software on a computer finishes the calibration and the diffraction pattern information acquisition so as to automatically measure the size and roundness of the tiny round hole at the same time. The measurement range (the diameter of the tiny round hole) of the device is 0.005-0.5mm.

The invention discloses a gradual change refractive index plasma lens-based device and method for generating a hollow light beam. The gradual change refractive index plasma lens-based device for generating the hollow light beam comprises a He-Ne laser source, an ultra-short pulse light source, an optical attenuation piece, a space light modulator, a reflector, a dichroscope, a non-linear liquid medium, a light shielding plate and a precise detector. The invention based on the pumping-detecting and gradual change refractive index plasma lens principle provides the method and device for generating the hollow light beam. Compared with the prior art, the method disclosed by the invention can conveniently and fast control the shape and size of black spots in annular light beams in real time by only changing the input power and focusing state of pumping light.

The invention relates to a near-field polarized light scanning probe microscope having a near-field optics detecting optical path in which a bundle of linearly polarized lights emitted from an He-Ne laser successively pass a quarter-wave plate A, a beam splitter, an objective lens A, and a probe to an objective table to form a near-field optics generation optical path. The reflected lights reflected from the probe successively pass the objective lens A, the beam splitter, a quarter-wave plate B, a Glan-Taylor prism, and the objective lens and are received by a photoelectric receiver to an image display system. The near-field polarized light scanning probe microscope can effectively inhibit a far-field background light and improves the signal to noise ratio of a near-field light, and the spatial resolution is less than 10 nanometers.

The calibrating device is composed of following parts: He-Ne laser, folding mirror with structure of aperture in cavity, drawknife mirror with aperture, convex mirror, Hartmann wave front sensor for detecting quality of light beam output from laser, main controller and concave mirror with actuator of step motor. Adjusting convex mirror of main control mirror can correct errors of slant, dithering and defocus of laser beam in high energy inside laser cavity. Comparing with prior art, the invention solves main factor of influencing quality of light quality so as to simplify installation and adjustment of control system. Features are: simple structure, stable, easy of manufacturing and easy of implementation of control algorithm.

The invention discloses a coaxial digital holographic microscopy imaging device and a method for detecting a glass subsurface defect. The coaxial digital holographic microscopy imaging device can realize imaging based on the double-beam interference principle and comprises a He-Ne laser, a collimating lens, a sample, a microobjective and a charge coupled device, which share an optical axis and are arranged sequentially in a light path direction, wherein the signal output end of the charge coupled device is connected with a computer, the He-Ne laser emits laser light, the laser light passes through the collimating lens to form a collimated light beam, the collimated light beam is irradiated on the sample, scattered light from the sample is sample light, and un-scattered light is reference light, the two light beams can form a hologram after being overlapped on the working surface of the microobjective, the hologram is imaged on the charge coupled device to be amplified and input into the computer by the microobjective, and the computer can reconstruct images of the sample in different depth according to the received amplified hologram. The coaxial digital holographic microscopy imaging device has a simple and stable structure and does not require mechanical scanning, and a three-dimensional image of the sample can be reconstructed with the hologram acquired once.

The invention discloses a He-Ne laser frequency stability measuring system, aiming to overcome the defects that the traditional system is only suitable for a normal environment and can not measure the frequency stability of a laser in environments of vibration, quickly changing temperature and the like. In the whole measuring system, an iodine stabilizing He-Ne laser is used as a frequency standard, an optical fiber measuring head is used to lead laser emitted from the He-Ne laser to be detected out from environments of vibration or quickly changing temperature to form interference with the iodine stabilizing He-Ne laser and generate stable beat frequency signals. Signal processing, such as filtering, amplifying, noise removing and the like, is carried out on the beat frequency signals through a special beat frequency signal measuring system to obtain a beat frequency value, the beat frequency value is transmitted to a computer through a USB interface for displaying and storing, and a frequency stability value is obtained through calculation. The invention has the advantages of leading out laser to be detected, isolating environment influences and keeping the polarization characteristics of the laser to be detected. The invention is suitable for measuring the He-Ne laser in the environments of vibration, quickly changing temperature and the like.

The invention discloses a refracting-reflecting type variable zoom laser expanding and collimating system. The laser expanding and collimating system comprises a refracting assembly and a reflecting assembly, wherein the refracting assembly consists of a first plano-convex spherical lens, a second refracting high-order aspheric plano-concave lens and a third plano-convex refracting high-order aspheric lens; the reflecting assembly consists of a fourth off-axis hyperboloid reflector and a fifth off-axis parabolic reflector; a monochrome Gaussian beam emitted by a laser passes through the first plano-convex spherical lens, the second refracting high-order aspheric photo-concave lens and the third plano-convex refracting high-order aspheric lens to finish primary collimating and expanding; parallel light subjected to expanding passes through the fourth off-axis hyperboloid reflector and the fifth off-axis parabolic reflector to finish secondary collimating and expanding. The refracting-reflecting type variable zoom laser expanding and collimating system can provide 6-30 fold continuous variable zoom expanding for a He-Ne laser with the wavelength being 0.6328 micrometer, has the advantages of simple structure, high expanding rate, no central obscuration and no solid convergent focal point, and can be applied to beam expanding of a high power laser.

The measuring device includes base, He-Ne laser interferometry system, pressure feed system and pressure measuring system. The base possessing connected four holes is a cubic platform made from organic glass in side length 7cm. Exits of four holes are connected to sample holder, pressure measuring system, pressure feed system and unloading valve. Sample holder is made from non-shrinking steel bolt. The pressure measuring system is connected in 'embedded type'. OFV-3000 optical fiber laser vibration gage is adopted in He-Ne laser interferometry system. Injection pump is as pressurized structure in the pressure feed system. Unloading valve can adjust system pressure. The method calculates strength with accuracy without limit of shape of basal body and magnitude of intensity.