251 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.

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 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 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 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 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 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.