40 results about "Wollaston prism" patented technology

The invention discloses a polarization imaging device and a polarization analysis method based on single-frame polarization collinear holography, and relates to the field of polarization imaging.According to the polarization imaging device, through combination of optical elements such as a half-wave plate, a Wollaston prism and a CCD camera, spatial multiplexing of a detector plane is carried out, and the polarization collinear holography is obtained. And four polarization collinear holograms can be simultaneously acquired by a single frame. According to the polarization analysis method, a Fourier transform auxiliary angular spectrum method is adopted to analyze an intensity distribution diagram of a polarization collinear hologram to estimate initial wavefront distribution, and an iterative finite support constraint selection method is adopted to solve the problem of twin images in the polarization collinear hologram. And further quantizing a complete Jones matrix and a complete Stokes parameter from the finally reconstructed complex amplitude information. The invention solves the problems of high complexity and long processing time caused by independent reconstruction of amplitude, phase and polarization in the traditional polarization holographic technology, and effectively solves the problem that the traditional off-axis polarization holographic imaging system limits the size of an imaging field of view.

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 invention discloses a Wollaston prism-based carrier frequency interference detection device and a Wollaston prism-based carrier frequency interference detection method, which are characterized in that a Wollaston prism is used for separating reference light from test light at a small angle to realize carrier frequency, so that a return error generated by a method for introducing the carrier frequency by inclining a to-be-detected object at a certain angle originally is avoided; and high-precision carrier frequency interference detection is realized. The Wollaston prism is moved through the high-precision displacement table, so that the detection device can be compatible with carrier frequency interference detection and normal Fizeau interference detection. By designing the relay lens with the ultra-low return error, the return error in an interference detection light path is further reduced, and the detection precision is ensured. According to the invention, the dynamic carrier frequency interference detection of the surface shape of the to-be-detected object can be effectively realized with high precision.

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 invention relates to a phase contrast microscopic imaging device based on miniaturized differential interference. According to the device, light emitted by a white light LED light source is refracted by a hemispherical lens to become parallel light, light path regulation and control are carried out through a polarizer and a beam splitter, and finally the light is guided to a Wollaston prism for differential processing. After being differentiated, the light is focused to the surface of a sample through a gradient refractive index lens. And when the signal light reflected by the sample is differentiated again through the Wollaston prism, the signal light is further processed by the polarization analyzer and the tube lens, and finally a differential signal is focused on the memory, so that imaging is completed. The miniaturized differential interference phase contrast microscopic imaging device has the core advantage that the high-performance gradient refractive index lens is adopted, so that the high-quality imaging effect can be ensured by virtue of the miniaturized design, and meanwhile, the size and the weight of equipment are also remarkably reduced. By integrating a series of miniature optical elements with a storage system, the system greatly reduces the complexity and manufacturing cost of the imaging device. In addition, the device is also combined with a micro-fluidic chip, and a miniaturized blood cell counting device is provided. The compact design of the device enables the device to have wide application potential, the device is particularly suitable for being used in the environment with limited resources, such as rural areas and remote areas, and the problem that local medical resources are deficient can be effectively solved. Through the innovative design, the low-cost and high-efficiency microscopic imaging technology is expected to greatly improve the diagnostic capability of primary medical facilities.

The present invention discloses a transient absorption spectroscopy measurement system, method and device for polarized light, relating to the technical field of ultrafast spectroscopy measurement. In this system, a laser generating device generates a first laser and a second laser. The first laser is converted into left-handed circularly polarized light or right-handed circularly polarized light by a pump light polarization device to serve as the pump light for exciting a sample to be measured. A first Glan prism converts the second laser into linearly polarized probe light in a specified direction to detect the sample to be measured. A first λ / 4 wave plate converts the probe light after detecting the sample to be measured into linearly polarized light with perpendicular polarizations. A Wollaston prism causes the linearly polarized light with perpendicular polarizations to propagate in different directions to a measurement device respectively. The measurement device calculates the transient absorption spectrum of the left-handed circularly polarized probe light and the transient absorption spectrum of the right-handed circularly polarized probe light. This system can simultaneously measure the transient absorption spectra of left-handed circularly polarized light and right-handed circularly polarized light, thereby reducing measurement errors.

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.

The present invention discloses a self-calibration measurement system and method applicable to the detection of lunar surface polarization spectral characteristics, belonging to the field of optical detection, including: along the propagation direction of incident light, a first achromatic quarter-wave plate, a multi-stage wave plate, a second achromatic quarter-wave plate, a beam splitting prism and two Wollaston prisms are sequentially arranged. The present invention uses the second achromatic quarter-wave plate, the beam splitting prism and two Wollaston prisms to form a polarization phase shift unit. After the incident light passes through the first achromatic quarter-wave plate and the multi-stage wave plate, the polarization information is modulated in the spectral dimension. The polarization phase shift unit shifts the modulated spectral phase by 0°, 180°, 90° and 270° to form two pairs of complementary modulated spectra. After the multi-stage wave plate is rotated by 90°, a secondary measurement is performed. The present invention can use the modulated spectra of the two measurements to extract the phase delay amount of the multi-stage wave plate in real time, and can solve the problem of the phase delay amount offset of the multi-stage wave plate caused by the temperature control fluctuation of the measurement system due to the large temperature difference on the lunar surface.

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.

The invention discloses a two-axis homodyne grating interference displacement measurement method and system based on a Wollaston prism and a four-quadrant detector, belongs to the field of grating interference displacement measurement, and is suitable for two-axis homodyne grating interference displacement measurement of horizontal and vertical displacement synchronous measurement. The method is used for solving the problem that a Wollaston prism (WP) is not matched with a four-quadrant detector (QPD) in a biaxial homodyne grating interference displacement measurement occasion in the prior art. The polarization direction of a certain device or a light beam of a light path is rotated, so that the direction of the optical axis connecting line of the double light beams is perpendicular to the normal direction of the interface of the Wollaston prism, and at the moment, the double light beams form four light spots which are distributed in a square shape through the Wollaston prism; the problem that the optical path of the double-axis parallel light is not matched with the optical path of the rotating Wollaston prism is solved, and effective utilization of four pixels of the four-quadrant detector is achieved.

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.

An observation apparatus includes a light source, a lens, a polarizer, a first prism, a condenser lens, an objective lens, a second prism, a ¼ wave plate, a lens, a polarization camera, and an analysis unit. Each of the first prism and the second prism is, for example, a Wollaston prism or a Nomarski prism. The ¼ wave plate inputs light output from the second prism, and outputs two circularly polarized light beams having different rotation directions. The polarization camera inputs two light beams being circularly polarized in different rotation directions by the ¼ wave plate, and acquires an interference image on an imaging plane for each of three or more polarization components.

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 invention discloses a miniaturized differential interferometric phase contrast (DIC) microscopic imaging system and method based on a gradient index lens (GRIN), light emitted by a white light LED light source is changed into parallel light after passing through a hemispherical lens, the parallel light is incident to a Wollaston prism through a polarizer and a beam splitter for difference, and then the parallel light is converged to a sample through the GRIN lens. And the reflected signal light is differentiated again through the wollaston prism, and then the differential signal is focused on the CMOS through the polarization analyzer and the tube lens, so that the imaging process is completed. The differential interference phase contrast microscopic imaging system is very sensitive to gradient due to the differential characteristic, so that compared with a common bright field microscope, the differential interference phase contrast microscopic imaging system can further highlight edge information, which is very important for industrial detection and biological sample observation. The miniaturized DIC microscopic imaging system is designed by combining a series of miniaturized optical elements and CMOS through the characteristics of small size and high imaging quality of the GRIN lens, so that the quality and the cost of the system are greatly reduced, the application range of the system is expanded, and edge microscopic detection can be applied to more fields.