31 results about "Wollaston prism" patented technology

The invention discloses an active focusing module of pathological section scanning equipment based on weak measurement, which is characterized in that incident light in a preset polarization state is emitted by a light source and is divided into first reference light and detection light through a polarization splitting prism and a Wollaston prism; the first reference light is reflected by the lower surface of the cover glass to form second reference light, the detection light is reflected by the surface of the sample to form sample light, and the second reference light and the sample light enter the Wollaston prism again for weak coupling and beam combination to form emergent light; the emergent light is received by a spectrometer after phase modulation and polarization selection, and the center-of-gravity shift of the double-peak spectrum can reflect the fluctuation height change of the surface of the sample, so that high-precision focusing is realized. According to the technology, the weak measurement principle is utilized, tiny physical quantity changes are converted into observable spectrum shift, the theoretical sensitivity reaches the picometer level, the focusing accuracy is remarkably improved, and the definition of a scanned image is guaranteed.

The present application relates to the technical field of laser quantum interference measurement, in particular to a three-degree-of-freedom angle measurement device and method based on radial polarized light, which can realize high-precision simultaneous measurement of three-degree-of-freedom small angles by using the characteristics of radial polarized light, combining advanced optical systems and signal processing technology. By using the self-collimation technology principle, the tight focusing characteristics of radial polarized light and the light splitting characteristics of Wollaston prism are combined, which can effectively improve the angle measurement resolution, angle measurement accuracy and other technical indicators; by using the focusing characteristics of the full-medium super-lens array and the CCD camera, the roll angle measurement system formed can greatly improve the measurement accuracy of the existing method.

The application belongs to the technical field of optical precision measurement, automation control and artificial intelligence, and particularly relates to an interference optical path for obtaining multiple information in single exposure and application thereof, the interference optical path comprising: rotating a polarization direction of a light source through a half-wave plate to obtain first linearly polarized light; the first linearly polarized light is evenly divided into reference light and test light by a common beam splitter; the reference light passes through a quarter-wave plate back and forth to obtain second linearly polarized light orthogonal to the first linearly polarized light; the test light is decomposed into third linearly polarized light and fourth linearly polarized light by a Wollaston prism; the third linearly polarized light and the fourth linearly polarized light irradiate on a measured object, pass through the Wollaston prism again after reflection, and are combined with the second linearly polarized light at the common beam splitter; the combined light beam is received by a polarization resolution camera and records interference signals.The application can realize absolute phase reconstruction in single exposure, and is suitable for measuring refractive index distribution of dynamic or environment-sensitive samples.

The utility model relates to the technical field of light beam separation angle measurement, and discloses a testing device for measuring a Wollaston prism light beam separation angle, which comprises a laser beam generator used for emitting a light beam; the first plane mirror is used for carrying out first reflection on the light beam emitted by the laser beam generator; the second plane mirror is used for carrying out second reflection on the light beam reflected by the first plane mirror; the sample objective table is used for placing a Wollaston prism sample and enabling the light beam reflected by the second plane mirror to enter the Wollaston prism sample; the light beam analyzer is used for receiving two light beams emitted by the Wollaston prism sample; the displacement driving motor is used for driving the light beam analyzer to move back and forth; the optical bread board is used for fixing the laser beam generator, the first plane mirror, the sample objective table and the displacement driving motor; the Wollaston prism beam splitting angle measuring device is high in moving precision and repeatability, and ensures that the Wollaston prism beam splitting angle is accurately measured and calculated.

This invention relates to a circular dichroism spectroscopy measurement system based on heterodyne phase modulation. It includes a broadband light source, a polarizer, a chiral sample, an α-BBO crystal, a Wollaston prism, two optical fibers, a CCD spectrometer, a data transmission line, and a data processing computer. The broadband light source, polarizer, chiral sample, α-BBO crystal, and Wollaston prism are arranged in a straight line. The system operates by combining incoherent spectral acquisition with heterodyne coherent spectral acquisition. During incoherent spectral acquisition, the polarizer's polarization direction is parallel to the Wollaston prism's optical axis, and the CCD spectrometer acquires coherent spectral information. During heterodyne coherent spectral acquisition, the polarizer's polarization direction forms a 45° angle with the Wollaston prism's optical axis, and the CCD spectrometer acquires coherent spectral information. Finally, the circular dichroism spectrum of the chiral sample is obtained through mathematical calculation. This system further improves the signal-to-noise ratio and optimizes measurement accuracy in circular dichroism spectroscopy.

The light splitting device comprises a first light splitting piece, a first wave plate, a magneto-optical crystal, a Wollaston prism, a second wave plate, a third wave plate and a second light combining piece which are arranged along a light path, the first wave plate is arranged on one light path after light splitting of the first light splitting part so as to ensure that the polarization state of linearly polarized light input into the magneto-optical crystal is kept consistent; the second wave plate and the third wave plate are respectively arranged in one of emergent light paths of the Wollaston prism; and a coil is arranged outside the magneto-optical crystal. According to the utility model, through currents of different magnitudes, the coil generates magnetic fields of different magnitudes, the magnetic fields of different magnitudes generate different rotation angles, the different rotation angles correspond to different sin2theta and cos2theta, and furthermore, through the Wollaston prism, two polarization states have light splitting of different proportions. And two beams of light with different splitting ratios are formed after beam combination.

The present invention discloses an active focusing module for a pathology slice scanning device based on weak measurement. The module emits incident light of a preset polarization state through a light source, which is divided into a first reference light and a detection light by a polarization beam splitter prism and a Wollaston prism. The first reference light is reflected by the lower surface of the cover glass to form a second reference light, and the detection light is reflected by the sample surface to form a sample light. The two then enter the Wollaston prism again for weak coupling and are combined into an outgoing light beam. The outgoing light is received by a spectrometer after phase modulation and polarization selection. The center of gravity offset of its bimodal spectrum can reflect the height variation of the sample surface, thereby achieving high-precision focusing. This technology utilizes the principle of weak measurement to convert tiny physical quantity changes into observable spectral offsets. The theoretical sensitivity reaches the picometer level, significantly improving the focusing accuracy and ensuring the clarity of the scanned image.

The utility model relates to an intracavity frequency doubling laser, which comprises a pumping source, a light beam combiner and a bidirectional optical amplifier, and is characterized in that a first optical fiber collimator, a first Wollaston prism, a first roof prism, a first Faraday rotator, a polarizer, a frequency doubling crystal, a first reflection cavity mirror and a second reflection cavity mirror are sequentially arranged on one side of the bidirectional optical amplifier along an optical path; and a second optical fiber collimator, a second Wollaston prism, a second roof prism, a second Faraday rotator and a rectangular prism are sequentially arranged on the other side of the bidirectional optical amplifier along the optical path. According to the utility model, the two Faraday rotators and the polarizer are utilized, the oscillation of the linear polarization fundamental frequency laser is realized by using the non-polarization-maintaining gain fiber, the generation of the frequency doubling laser is realized through the frequency doubling crystal in the cavity, and finally the stable frequency doubling laser is output through the endoscope; the utility model has the characteristics of low manufacturing cost, high extinction ratio and high frequency doubling efficiency.

The application discloses a three-port reflective circulator and a preparation method thereof. The three-port reflective circulator comprises a three-fiber pigtail, a ring-shaped core and a plurality of glass tubes. The tail fiber end face of the three-fiber pigtail is subjected to a hot expansion core treatment. The ring-shaped core comprises a polarization beam splitting assembly, a rotary optical assembly and a refractive assembly. The polarization beam splitting assembly comprises a displacement crystal. The rotary optical assembly comprises a half-wave plate group, a rotary optical unit, a half-wave plate and a compensating plate. The refractive assembly comprises a collimating lens, a Wollaston prism and a mirror. The three-fiber pigtail and the ring-shaped core are sleeved by the plurality of glass tubes. In the application, the light emitted by the three-fiber pigtail passes through the polarization beam splitting assembly, the rotary optical assembly and the refractive assembly in sequence, is reflected by the mirror, and returns to the three-fiber pigtail by passing through the refractive assembly, the rotary optical assembly and the polarization beam splitting assembly in sequence. The three-port reflective circulator in the application has a more compact structure and a smaller size, and can be widely applied to the technical field of optical devices.

The invention provides an absorption laser differential interferometer. The device comprises a signal generator, a laser controller, a laser, a plane mirror FM, a first variable polarization beam splitter vPBS1, a second variable polarization beam splitter vPBS2, a half-wave plate HWP, a first Wollaston prism Wp, a first optimal shape spherical lens L1p, a second optimal shape spherical lens L2p, a first field lens L1c, a second field lens L2c, a second Wollaston prism WC, a non-polarization beam splitter BS and a quarter-wave plate QWP. A linear polarizer LP; and an oscilloscope. The device is simple and reasonable in structural design, can realize more complete and accurate representation of a high-speed flow field, and realizes multi-parameter synchronous measurement of the flow field; when the two technologies are combined for use, the limitation of a single method can be overcome, the physical integrity of measurement is improved, the applicability in a complex flow environment is enhanced, and the measurement capability in the fields of hypersonic wind tunnel experiments, scramjet engine combustion diagnosis, turbulent flow research and the like is improved.

The application discloses a kind of dual-channel hyperspectral imaging device and method based on Sagnac interferometer.The incident light from target collimates after passing through pre-imaging objective, diaphragm and collimating objective, and is incident to Wollaston prism again after passing through polarizer, and Wollaston prism shears incident light into different direction o light and e light, and after passing through Sagnac waveband division shear structure, different waveband o light and e light produce different lateral shear amount, and are emitted along different directions, pass through polaroid array and filter array, and finally form spatially separated two different waveband interference images on area array detector by post-imaging objective.The application can obtain two groups of interference images under different wavebands by once push scanning, and realizes high-resolution spectral imaging under wide waveband range.

A two-axis homodyne grating interference displacement measurement method and system based on a Wollaston prism and a four-quadrant detector belong to the field of grating interference displacement measurement and are suitable for two-axis homodyne grating interference displacement measurement for synchronous measurement of horizontal and vertical displacements. The method is used for solving the problem that a Wollaston prism (WP) and a four-quadrant detector (QPD) are not matched in the prior art in the two-axis homodyne grating interference displacement measurement occasion. In the method, a certain device in an optical path or a polarization direction of a light beam is rotated, so that a direction of a connecting line of two light beams is perpendicular to a normal direction of a dividing surface of the Wollaston prism. At this time, the two light beams pass through the Wollaston prism to form four light spots in a square distribution, so that the problem of optical path mismatch between the two-axis parallel light and the rotating Wollaston prism is solved, and the four pixels of the four-quadrant detector are effectively utilized.

The application discloses a kind of shearing and carrier frequency independently adjustable common-path shearing interferometry imaging system and method, including coherent light source, the light beam of coherent light source is shot to the surface of measured object by beam expander, and measured object, lens one, diaphragm, lens two, Wollaston prism, polaroid, imaging lens, camera are sequentially arranged on the same axis with measured object.The application also discloses a kind of shearing and carrier frequency independently adjustable common-path shearing interferometry imaging method.The application uses the above-mentioned one kind of shearing and carrier frequency independently adjustable common-path shearing interferometry imaging system and method, the control of shear quantity and spatial carrier frequency in imaging system is distributed to different parts of imaging system, and adjustable near-zero shear quantity provides small enough shear force, to ensure that complex surface shape or deformation can be solved;When configuring the required near-zero shear quantity, the separate control of spatial carrier wave further ensures the well-distributed spatial spectrum.

This invention discloses a laser interferometric device for simultaneous measurement of straightness and displacement that is insensitive to angular errors. It comprises an interferometric optical path and a measurement mirror assembly. The measurement mirror assembly consists of a Wollaston prism, a cornerstone prism, and a beam splitter, forming a moving measurement mirror. As this measurement mirror moves, it generates two measurement beams with different Doppler frequency differences. These beams are received by two photodetectors, outputting two measurement signals. These signals, along with a reference signal from a dual-frequency laser, are processed by a signal processing board and a computer to obtain the straightness error and displacement of the measured object. This invention achieves simultaneous measurement of straightness and displacement within a single laser interferometric device through the combination of the Wollaston prism, cornerstone prism, and beam splitter. By utilizing the insensitivity of the Wollaston prism and cornerstone prism to angular errors, the influence of the angular error of the measured object on the straightness error and displacement measurement results is reduced, thus improving measurement accuracy and stability.

The application provides a high-contrast polarization imaging system for direct imaging of exoplanets, which comprises a coronagraph system, a relay lens, a polarization modulation assembly based on phase modulation, an imaging lens and a detector. A polarimeter is introduced on the basis of the coronagraph system, a liquid crystal phase retarder is used as a modulation device, different intensity values are obtained by applying different voltages, and finally the Stoeks parameter is inverted. In view of the fact that the planet light has certain polarization characteristics and the star light has no polarization characteristics, the planet light can be distinguished from the star light after passing through the high-contrast polarization imaging system, and high-contrast polarization imaging is realized. Meanwhile, the system introduces a Wollaston prism to form a double light path, so as to reduce the influence of atmospheric turbulence, and meanwhile, additional contrast gain can be obtained, and an imaging contrast gain of about 100 times can be realized.

The application relates to an atmospheric gravity wave interference imaging observation instrument based on a birefringent crystal, wherein a main optical axis direction of an incident light line is a z-axis direction, a direction perpendicular to the main optical axis into a room is an x-axis direction, and an xyz coordinate system satisfying a right-hand rule is constructed; the instrument comprises, in sequence along the incident light line, a front telescope, a first collimating mirror, an aperture segmentation and polarization combination structure, a wide-field delay module, a second telescope, a second collimating mirror, a roof prism, a Wollaston prism, an imaging mirror and a detector; the roof prism is arranged at a conjugate image position of an aperture diaphragm behind the second collimating mirror. The application adopts a polarization combination aperture segmentation mode, avoids splitting of an incident wide-field delay module light beam, makes the light beams of upper and lower parts be incident at the same angle, and solves the problems of limited detection field of view and undersampling of interference fringes in a partial field of view region in the prior art. The application greatly improves a usable field of view range of the system and reduces a wind speed inversion error.

This application discloses a method and apparatus for generating light sheets. The apparatus, along the direction of light propagation, sequentially includes: a light source module having a laser for generating a laser beam; a polarization state pre-adjustment module configured to collimate and rotate the polarization direction of the laser beam; a Wollaston prism, wherein a laser beam whose polarization direction is rotated by the polarization state pre-adjustment module to form a 45° angle with the optical axis of the Wollaston prism is incident on the Wollaston prism, so that two beams of light are emitted from the Wollaston prism; a one-dimensional shaping module; a polarization adjustment and optical path compensation module; a dual-mirror synchronous scanning module; and an objective lens.

The application discloses a kind of based on Wollaston prism carrier frequency interference detection device and method, utilize Wollaston prism and test light with reference light produce small angle separation to realize carrier frequency, to avoid the method of introducing carrier frequency by the object to be measured to tilt a certain angle to generate return error, realize high-precision carrier frequency interference detection.Through high-precision displacement table, Wollaston prism is moved, so that the detection device can be compatible with carrier frequency interference detection and normal Fizeau interference detection.The application further reduces the return error in the interference detection optical path by designing a relay lens with ultra-low return error, ensuring the detection accuracy.Using the application, dynamic carrier frequency interference detection of the surface shape of the object to be measured can be effectively and accurately realized.

The invention provides a plasma plume density diagnosis system based on a Wollaston prism. The plasma plume density diagnosis system comprises a laser ablation subsystem, a differential interference subsystem, an image acquisition subsystem and a general subsystem, the laser ablation subsystem is used for generating plasma plume; the differential interference subsystem is used for providing a beam of high-quality and collimated continuous laser as probe light for interference measurement, realizing detection of a density field of plasma plume, and converting phase change caused by plasma into a recordable interference fringe pattern; the image acquisition subsystem is used for capturing a transient interference fringe pattern in a target material ablation process under accurate time sequence control; and the general subsystem is used for providing a stable and controllable experimental environment for a target ablation experiment. The device is high in anti-interference capability, high in measurement precision and high in temporal-spatial resolution, can realize clear imaging of the evolution process of transient plasma plume generated by laser ablation, and quantitatively inverts the distribution of a two-dimensional electron density field.

This invention relates to the field of optical technology, and discloses a calibration system and method for the relative spectral responsivity of an optical power meter to improve calibration efficiency and accuracy. The system includes: a GranTaylor prism and a Wollaston prism arranged adjacent to each other; a set of concave mirrors with increasing curvature positioned between the GranTaylor prism and the monochromator light source; and, following the Wollaston prism, a third concave mirror and a first y-cylindrical mirror for projecting a first beam of light onto a first detector, and a fourth concave mirror and a second y-cylindrical mirror for projecting a second beam of light onto a second detector; wherein the GranTaylor prism is used to adjust the outgoing light into linearly polarized light with an angle of 45° to the vertical direction, and the y-direction of the reflecting cylinder of the cylindrical mirror is the vertical direction, while the plane on which the breadboard used to deploy the calibration system components is located is a horizontal plane.

An optical device is provided that incorporates twin wavelength selective switches (WSSs), is compact, and avoids using a Wollaston prism. Additionally, the path lengths traversed by wavelength components through each WWS may be the same. The optical device may include a first subset and second subset of optical ports, where each of the first and second subsets can operate as an independent WSS. An optical arrangement of the optical device may support optical coupling between (i) any ports in the first subset of ports for light in a first polarization state and (ii) any ports in the second subset of ports for light in a second polarization state. The optical device may further include beam directing optics for coupling wavelength components of an optical beam from a focusing element to a programmable optical phase modulator and from the programmable optical phase modulator to the focusing element.

The present invention relates to a high-power optical fiber device refractive index dual-wavelength polarization holographic microscopic three-dimensional detection system and working method based on a metasurface cylindrical lens, belonging to the field of optical measurement. It comprises a first laser, a second laser, a first reflector, a first non-polarizing beam splitter prism, a first half-wave plate, a beam expander, a polarizing beam splitter prism, a second reflector, a first metasurface cylindrical lens pair, a Wollaston prism, a second half-wave plate, a third reflector, a second metasurface cylindrical lens pair, a sample optical fiber, a second non-polarizing beam splitter prism, a first filter, a first CCD detector, a second filter, a second CCD detector and a computer. The present invention adopts a metasurface cylindrical lens, a dual-wavelength polarization phase fusion interferometric detection method and a full-aperture aberration-corrected filtered back-projection refractive index three-dimensional reconstruction method to further improve the three-dimensional distribution detection accuracy and efficiency of the refractive index and fusion defects of high-power optical fiber devices.

The utility model discloses a one-to-four-path high extinction ratio optical system, which belongs to the field of laser interference measurement and comprises a laser, a Wollaston prism, a first light path and a second light path, linearly polarized light emitted by the laser is divided into two beams of light by the Wollaston prism, and the two beams of light enter the first light path and the second light path respectively; the first optical path comprises a first optical isolator, a first 1 / 2 wave plate, a first three-axis optical fiber collimator and a first polarization-maintaining optical fiber coupler; and the second optical path comprises a second optical isolator, a second 1 / 2 wave plate, a second three-axis optical fiber collimator and a second polarization-maintaining optical fiber coupler. According to the utility model, on the premise that only one laser is used, the high polarization extinction ratio, power equalization and the same polarization direction of linearly polarized light are ensured, and the device has the advantages of stable performance, high reliability, compact structure and low cost.

An optical device is provided that incorporates twin wavelength selective switches (WSSs), is compact, and avoids using a Wollaston prism. Additionally, the path lengths traversed by wavelength components through each WWS may be the same. The optical device may include a first subset and second subset of optical ports, where each of the first and second subsets can operate as an independent WSS. An optical arrangement of the optical device may support optical coupling between (i) any ports in the first subset of ports for light in a first polarization state and (ii) any ports in the second subset of ports for light in a second polarization state. The optical device may further include beam directing optics for coupling wavelength components of an optical beam from a focusing element to a programmable optical phase modulator and from the programmable optical phase modulator to the focusing element.

The application provides a kind of space charge measurement electrically excited ellipsometric joint detection system and method, the high voltage pulse source of the excitation part generates electric pulse, disturbs the space charge accumulated in the interior of insulating sample and excites elastic wave, the elastic wave is transmitted to the photoelastic sensor that is attached to the surface of polarization electrode, causes the refractive index change of sensor;Subsequently, the detection part adopts the ellipsometric measurement light path, is polarized after polaroid and is incident to photoelastic sensor, and the reflected light is decomposed into two orthogonal polarized lights by 1 / 4 wave plate and Wollaston prism in turn, and the light intensity difference is detected by balanced detector difference, so that the elastic wave signal is converted into electrical signal output.The physical isolation of detection end and high voltage loop is realized, and the breakdown risk of capacitive isolation is avoided;At the same time, since the detection laser does not need to be in direct contact with the sample, the damage of the original electric field distribution of the insulating sample by the full contact structure is eliminated, and the measurement result more truly reflects the original state of the internal space charge of the insulating sample.

The invention relates to a high-sensitivity, optically-pumped vector magnetometer (OPM), in particular an OPM which defines its sensitive direction independently of the position of the external (Earth's) magnetic field. The aim of the invention is to provide an optically-pumped vector magnetometer (OPM) which defines its sensitive direction independently of the position of the external (Earth's) magnetic field and which can be used in the Earth's magnetic field without shielding while having a high bandwidth and, at the same time, a very high degree of sensitivity in any spatial direction. This is achieved in that the magnetometer has an OPM sensor head (3), which is surrounded by an external magnetic field (4), and a light source (5) for generating pump light and sample light, wherein the light of the light source (5) passes through a converging lens (6), a polarization filter (7), a quarter-wave plate (8), a Wollaston prism (9), a wedge prism (10), a deflection prism (11), and a half-wave plate (12) in order to generate the sample light, as pump light, by means of an alkali vapor-filled OPM cell (13), which has a thermally insulated housing (14), said sample light striking photodiodes (16), in order to be detected, from the OPM cell (13) via a deflection prism (11). The OPM sensor head (3) is located in the interior (2) of a permanent magnet (1), and the interior (2) encloses a statically homogeneous magnetic field in the form of a constant holding field (15), which extends perpendicularly to the axis of rotation of the permanent magnet (1) and overlaps with the external magnetic field (4). The magnetic flux density of the holding field (15) is at least ten times greater than that of the external magnetic field (4), and the OPM sensor head (3) measures the value of the vectorial sum of the holding field (15) and the external magnetic field (4).

The present invention discloses an interference phase imaging system, method and three-dimensional morphology reconstruction method, which include a laser, a first beam splitting prism, a second beam splitting prism, a first lens, a second lens, a third lens, a Wollaston prism, a sample, an aperture stop, an objective lens, a polarizer and a CCD; by using a beam splitting prism to split the laser beam, the present invention has a simple structure and is easy to operate; by adjusting the angle of the total reflection mirror to change the included angle between the two object beams incident on the sample, phase diagrams of incident light at different angles can be obtained, which is flexible and has strong applicability; through a symmetric optical path design, the two object beams have symmetry in the propagation path, ensuring the stability of the system of the present invention; two interference diagrams of the same sample in different incident directions can be obtained by one CCD, which has a simple structure, is beneficial to miniaturization of the device and cost reduction. The three-dimensional morphology reconstruction method disclosed by the present invention requires a small amount of data, is simple to calculate, has a fast speed, and is beneficial to real-time imaging.

Shearography systems provide independent setting of fringe frequency and shear magnitude by situating an interferometer with a tiltable reflector proximate a pupil plane of an imaging optical system. Fringe frequency can be selected based on a modified Savart plate. In other examples, a Wollaston prism or a polarization grating is translated with respect to an image sensor to vary shear magnitude while maintaining a substantially fixed fringe frequency.

The application relates to a device and a method for generating high-power broadband terahertz radiation by utilizing sulfur-doped gallium selenide crystals, which comprises a femtosecond laser, a beam splitter, a first reflector, a second reflector, an optical delay line, a mechanical chopper, a BBO frequency-doubling crystal, a sulfur-doped gallium selenide crystal, a terahertz horizontal polarizer, a zinc telluride crystal, a 1 / 4 wave plate, a Wollaston prism, a balanced detector and a lock-in amplifier, the first reflector and the second reflector are respectively arranged on two light paths split by the beam splitter, the mechanical chopper, the BBO frequency-doubling crystal, the sulfur-doped gallium selenide crystal, the terahertz horizontal polarizer, the zinc telluride crystal, the 1 / 4 wave plate, the Wollaston prism, the balanced detector and the lock-in amplifier are sequentially arranged along the light path, and the optical delay line is further arranged between the first reflector and the zinc telluride crystal. Compared with the prior art, the application has the characteristics of simple device, easy operation, operation at room temperature, high terahertz radiation power and wide frequency band.

The embodiment of the application discloses a kind of orthogonal polarized light control device, interferometer and grating displacement measurement system.Therein, by setting double-frequency laser and first Wollaston prism, wherein double-frequency laser emits first light beam and second light beam, the first light beam includes first linearly polarized light, the second light beam includes second linearly polarized light, the polarization direction of the first linearly polarized light is perpendicular to the second linearly polarized light;First Wollaston prism is used to emit the first linearly polarized light at first preset angle, and the second linearly polarized light is emitted at second preset angle, can realize two linearly polarized light of complete orthogonal.This embodiment of the application solves the problem that the existing laser is difficult to meet the requirement of the measurement system on the polarization of linearly polarized light, and can realize the incident light with high polarization linearity and orthogonality, to ensure that the polarization linearity of two light beams meets the measurement requirements.