33 results about "Dispersive prism" patented technology

The invention belongs to the field of astronomical telescopes, and particularly relates to a large-aperture spliced telescope adjusting device and method, and the method comprises the steps: starting a light source module, providing a far-field illumination light beam for a spliced primary mirror, and carrying out the confocal adjustment of each sub-mirror through an adjusting mechanism according to the far-field illumination light beam; the light source switching module is used for providing a near-field illumination light beam for the spliced primary mirror, and the near-field illumination light beam is split into two separated sub light beams by the pyramid mirror after penetrating through a splicing seam of the spliced primary mirror; performing dispersion on all the sub-beams through a dispersion prism, and converging the dispersed sub-beams through an achromatic lens to form dispersion stripes; the phase difference of the dispersion fringes is extracted through the camera, and co-phase adjustment is carried out on the sub-mirrors through the adjusting mechanism according to the phase difference of the dispersion fringes. According to the invention, high-precision and high-flux spectral response calibration and co-phase detection of the large-aperture spliced telescope can be realized, so that reliable technical support is provided for construction and operation of a next-generation giant astronomical telescope.

The invention belongs to the technical field related to laser, and particularly relates to an acousto-optic deflector dispersion compensation method based on a dispersion prism group, which comprises the following steps: configuring the dispersion prism group; with the light spot of the monochromatic laser beam emitted from the prism group as a circle as a constraint, the incident angle of the laser incident to the first dispersion prism and the second dispersion prism when the negative space dispersion generated by the prism group and the positive space dispersion of the to-be-compensated acousto-optic deflector are equal and opposite in size is calculated; the relative spatial position between the two prisms is determined and adjusted by taking the incident angle of a laser beam incident to the first dispersion prism and the second dispersion prism and the vertical incidence of laser emitted from the prism group to the receiving surface of the acousto-optic deflector as constraints, so that spatial dispersion compensation is realized; and the distance between the central position of the dispersion prism group and the central position of the acousto-optic deflector is calculated and adjusted when the negative time dispersion generated by the prism group is equal to and opposite to the positive time dispersion of the acousto-optic deflector, so that time dispersion compensation is realized. The method is wide in application range of space-time dispersion to be compensated.

The invention provides an interference line spectrum confocal measurement structure, which comprises a line light source, a beam splitter prism, a dispersion prism, a dispersion objective lens and a spectrum demodulation module, and is characterized in that the line light source is used for generating a strip-shaped narrow light source, the beam splitter prism is a polarization insensitive prism, and the strip-shaped light source is equally divided into two mutually vertical light paths; the strip-shaped light is then subjected to off-axis dispersion by the dispersion prism and is axially dispersed by the dispersion objective lens, finally an irradiation surface perpendicular to the horizontal direction is formed, the illumination surfaces of the two light paths interfere with each other and are enhanced, and the strip-shaped light returns along the symmetrical light paths and enters the spectrum demodulation system; the spectrum demodulation system is composed of the dispersion prism and the dispersion objective lens, high linearity of the height and the position can be achieved, meanwhile, the device can conduct high compression on the width of a detection signal, and the measurement precision and repeatability of the device can be improved at the same time.

The invention provides a spliced detector flatness large-flux in-situ detection method which comprises the following steps: a light source emits a light beam which is compressed by a cylindrical lens, then is dispersed by a dispersion prism and respectively enters the edges of two adjacent detectors, and the two light beams are reflected by the surfaces of the detectors and then converge to generate dispersion stripes; a fixed difference calibration mode is adopted to calibrate stripe slope singularity caused by edge stripe variation in the dispersion stripe forming process; a band elimination filter is used for generating band elimination of a specific wave band in the dispersion fringes, and the channel spectrum is tested by analyzing the characteristics of the band elimination; the edge position of each detector is finely adjusted by using a dispersion prism, and the edge position of each detector is adjusted through deviation of a pupil position in combination with multi-point light emitted from one side of a wide-angle optical system by using an optical fiber interconnection system. According to the invention, the confocal and co-phase adjustment speed and precision of the spliced detector are greatly improved, and the regulation and control requirements of extremely high information flux and rapid convergence of a large-aperture system are met.

The invention relates to the technical field of radiation imaging, and discloses a rapid radiation imaging system and method integrating optical imaging and coding hole technology, and the system comprises a spectral imaging subsystem and a gamma ray imaging subsystem. Wherein the spectral imaging subsystem and the gamma-ray imaging subsystem share a coding pore plate, the gamma-ray imaging subsystem further comprises a radiation detector, and the spectral imaging subsystem further comprises a first lens, a second lens, a dispersion prism, a third lens and a CCD detector; the first lens, the coding pore plate, the second lens, the dispersion prism and the third lens are sequentially arranged in the direction from a target to be detected to the radiation detector and the CCD detector. According to the invention, spectral imaging and radiation imaging can be carried out simultaneously, the complexity and cost of the system are reduced, and the working efficiency and safety are improved.

The invention discloses a high-efficiency optical parametric oscillator, and belongs to the technical field of lasers, the high-efficiency optical parametric oscillator comprises a pumping source output assembly, a coupling system, a first resonant cavity mirror and a nonlinear crystal which are sequentially arranged along the direction of an optical path, a dispersion prism is arranged at a light outlet of the nonlinear crystal, and the dispersion prism can divide light into signal light and idler frequency light; the dispersion prism and the light source are transmitted along a first light path and a second light path respectively, a second resonant cavity mirror is arranged on the first light path, an optical parameter adjusting assembly is arranged between the dispersion prism and the second resonant cavity mirror, and a third resonant cavity mirror is arranged on the second light path. According to the high-efficiency optical parametric oscillator provided by the invention, the light-light conversion efficiency and high light beam quality of parametric light can be simultaneously obtained under different power pumps under the conditions of not changing a cavity type structure and not needing to be reassembled and adjusted under the different power pumps.

The application discloses a kind of multi-functional gas component concentration monitoring sensors in tunnel and use method, belong to road construction technical field.The application includes white laser emitter, 90° prism, beam splitter, dust cleaner, dispersion prism, 180° prism, dispersion light intensity detector, phase interference range finding device, data processing and sending device and guide rail.The application solves the problem that the function of the existing monitoring sensor in tunnel is single, and the cost is higher and the monitoring efficiency is lower by relying on multiple single-function sensors for monitoring;The application significantly improves the monitoring accuracy of the concentration of various gas components by full-spectrum coverage and double-data comparison to average, breaks through the limitations of traditional single-function sensors, without multiple sensor devices in parallel, significantly reduces the overall operating cost, improves monitoring efficiency.

The present invention relates to the field of optical devices, and discloses an optical display device and an AR display device. The optical display device includes an image source, a first dispersive prism, a second dispersive prism, and a first lens. The image source is disposed on a side of a first surface of the first dispersive prism, and the first lens is fitted closely with a second surface of the first dispersive prism. A first surface of the second dispersive prism is fitted closely with a third surface of the first dispersive prism. The first surface of the first dispersive prism is on a side close to eyes of a wearer. A first half-transparent half-reflective film is disposed on a surface on a side of the first lens away from the first dispersive prism.

The present invention relates to the field of radiation imaging technology, and discloses a fast radiation imaging system and method integrating optical imaging and coded aperture technology. The system includes a spectral imaging subsystem and a gamma-ray imaging subsystem. Among them, the spectral imaging subsystem and the gamma-ray imaging subsystem share a coded aperture plate. The gamma-ray imaging subsystem further includes a radiation detector, and the spectral imaging subsystem further includes a first lens, a second lens, a dispersion prism, a third lens and a CCD detector. In the direction from the object to be measured towards the radiation detector and the CCD detector, the arrangement order is successively the first lens, the coded aperture plate, the second lens, the dispersion prism and the third lens. The present invention can perform spectral imaging and radiation imaging simultaneously, reduce the system complexity and cost, and improve the working efficiency and safety.

The present invention relates to a spectral imaging method based on high-order mathematical modeling and fitting calibration, belonging to the technical field of spectral imaging. An equivalent correction code is set in the established high-order mathematical model, and while implementing the encoding operation, it characterizes the response non-uniformity. Before and after the equivalent correction code of the established high-order mathematical model, a group or multiple groups of two-dimensional convolution kernels are set to comprehensively characterize non-ideal factors such as aberration, pixel mismatch, high-order dispersion, and assembly error, improving the coincidence degree between the mathematical model and the actual projection measurement process. The calibration process of the high-order mathematical model parameters is constructed as an inverse optimization problem, training sample data is collected, and an optimization algorithm is used to solve the constructed optimization problem to complete the calibration of the high-order mathematical model parameters, improving the practicability of the calibration method. After the spectral data cube is modulated by the coded aperture and the dispersion prism, it is imaged onto the detector. Finally, based on the established high-order mathematical model, a reconstruction algorithm is used to reconstruct the spectral image.

This invention relates to a pushbroom hyperspectral imaging system for unmanned aerial vehicles (UAVs). A line-plane combined aperture has a slit and a rectangular window. A front-facing lens images the target scene into the rectangular window. The light is collimated by a collimating lens to generate parallel light, then passes through a dispersive prism without dispersion, and finally reaches a focal plane detector through a focusing lens, obtaining a high-resolution image. By comparing the high-resolution images between adjacent frames, pose change information is obtained. The front-facing lens also images the target scene into the slit, collimated by a collimating lens to generate parallel light, then passes through a dispersive prism to cause dispersion, and finally reaches a focal plane detector through a focusing lens, obtaining a multispectral image. The pose change information is used to calibrate the multispectral image of the current frame, and the calibrated images are then stitched together to obtain the final hyperspectral image of the target scene. This invention has a simple and easy-to-use structure, requiring no additional system to assist in image stitching.

This invention relates to a hyperspectral microscopic imaging system, comprising a front imaging module and a hyperspectral back imaging module; the front imaging module is used to collect sample light signals and image a front image beam; the hyperspectral back imaging module is used to disperse the front image beam along the dispersion direction to obtain a spatial spectral image; it includes: a magnifying lens group, a segmentation component, and a dispersive lens group; the front image beam is magnified into a magnified image in the dispersion direction by the magnifying lens group, and the segmentation component is disposed on the image plane of the magnified image; the segmentation component consists of multiple microlens groups arranged side by side along the dispersion direction covering the range of the magnified image; the dispersive lens group includes a collimating lens and a converging lens with the same focal length, the collimating lens and the converging lens forming a relay lens group, and a dispersive prism is disposed between them along the dispersion direction. The hyperspectral microscopic imaging system provided by this invention magnifies the multispectral superposition spatial image obtained by the front imaging module through a magnifying lens group, and then divides and converges it into discrete sub-images through a segmentation component, creating camera detection resources for recording spectral information. The dissociated spectral information is integrated into the spatial information and recorded by the camera to obtain a spatial-spectral image without superposition crosstalk. While achieving spatial-spectral separation, it reduces the distortion of spatial information.

The present invention belongs to the field of laser-related technologies and specifically relates to a method for compensating for dispersion in an acousto-optic deflector based on a dispersive prism assembly. The method comprises: configuring a dispersive prism assembly; constraining the monochromatic laser beam spot emitted from the prism assembly to be circular, calculating the incident angles of the laser beam incident on a first dispersive prism and a second dispersive prism when the negative spatial dispersion generated by the prism assembly is equal to or greater than the positive spatial dispersion of the acousto-optic deflector to be compensated; constraining the incident angles of the laser beam incident on the first and second dispersive prisms and the laser beam emitted from the prism assembly to be perpendicular to the receiving surface of the acousto-optic deflector, determining and adjusting the relative spatial position between the two prisms to achieve spatial dispersion compensation; and calculating and adjusting the distance between the center of the dispersive prism assembly and the center of the acousto-optic deflector when the negative temporal dispersion generated by the prism assembly is equal to or greater than the positive temporal dispersion of the acousto-optic deflector to achieve temporal dispersion compensation. The method of the present invention has a wide range of applications for compensating for spatiotemporal dispersion.

This invention belongs to the field of spectral imaging technology and relates to a multi-slit hyperspectral imaging system and method based on an unmanned aerial vehicle (UAV), comprising: a front objective lens; a multi-slit assembly including multiple slits for sampling the output image plane of the front objective lens using the multiple slits to obtain multiple sampling strips corresponding to the number of slits; a beam splitting imaging assembly, specifically comprising: a collimating lens group for collimating the multiple sampling strips output by the multi-slit assembly; a dispersive prism group including a first Amish prism and a second Amish prism for dispersing and splitting the multiple sampling strips output by the collimating lens group; a focusing lens group for focusing and imaging the multiple dispersive and split sampling strips output by the dispersive prism group to obtain multiple spectral data; a detector for fusing the multiple spectral data with spatial information to obtain multiple spectral images; and a host computer for fusing the multiple spectral images to obtain a target spectral image.

The application discloses a kind of dispersion prism self-rotating direction's calibration method and device, the method includes: the dispersion prism, flat mirror and theodolite are placed according to measurement light path;Adjust the angle of theodolite, precision measuring mirror and flat mirror, make the self-rotating image reflected by flat mirror coincide with the cross wire in theodolite ocular, obtain initial angle;The geometry of the back surface, front surface and front end face of dispersion prism is fitted using multiple points, obtain first spherical surface, second spherical surface and first plane;Second plane where dispersion prism is located is fitted;Based on initial angle, adjust the angle of precision measuring mirror, theodolite and flat mirror, make the self-rotating image returned by flat mirror coincide with the cross wire of theodolite;Measure the target included angle of second plane and fourth plane, and take the target included angle as the final calibration value of the self-rotating direction of dispersion prism.The above-mentioned method introduces the reference of the self-rotating direction of dispersion prism to precision measuring mirror, and improves the calibration accuracy of the self-rotating direction and the assembling efficiency of dispersion prism.

The invention discloses a multifunctional gas component concentration monitoring sensor in a tunnel and a use method, and belongs to the technical field of road construction. The device comprises a white laser transmitter, a 90-degree prism, an optical splitter, a dust cleaner, a dispersion prism, a 180-degree prism, a dispersion light intensity detector, a phase interference distance measuring device, a data processing and transmitting device and a guide rail. The problems that an existing monitoring sensor in a tunnel is single in function, and the cost is high and the monitoring efficiency is low due to the fact that multiple single-function sensors are used for monitoring are solved. The average value is obtained through full-spectrum coverage and dual-data comparison, the monitoring precision of the concentration of multiple gas components is remarkably improved, the limitation of a traditional single-function sensor is broken through, parallel operation of multiple sensor devices is not needed, the overall operation cost is greatly reduced, and the monitoring efficiency is improved.

The present invention provides an interference line spectrum confocal measurement structure, including a line light source, a spectroscopic prism, a dispersion prism, a dispersion objective lens, and a spectrum demodulation module. The line light source is used to generate a strip narrow light source. The spectroscopic prism is a polarization-insensitive prism, which divides the strip light source into two mutually perpendicular light paths. The strip light is then dispersed off-axis by the dispersion prism and axially by the dispersion objective lens, ultimately forming an illumination surface perpendicular to the horizontal. The illumination surfaces of the two light paths interfere with each other and enhance each other, and then return along the symmetrical light path again and enter the spectrum demodulation system. The spectrum demodulation system is composed of the dispersion prism and the dispersion objective lens, and can achieve high linearity in height and position. At the same time, the device can highly compress the detection signal width, thereby improving the measurement accuracy and repeatability of the device.

Device (10) for detecting an object surface (16), comprising: a radiation generating device (17) with at least one radiation source (12), wherein the radiation generating device (17) is configured to emit first electromagnetic radiation with a first wavelength and second electromagnetic radiation with a second wavelength onto a linear measuring field on an object surface (16) with at least one measuring point (32) of the object surface (16) to be measured or an area of ​​the object surface (16) to be measured, which has at least one measuring point (32) to be measured, wherein the radiation generating device (17) is configured to emit no radiation or radiation used for surface detection onto the measuring point (32) to be measured or onto the area of ​​the object surface (16) in a wavelength range between the first wavelength and the second wavelength.such that the first and second wavelengths are different from each other; and a detection device (31) configured to detect at least one first measurement value and at least one second measurement value for each of the measurement points (32) to be measured, wherein the first measurement value is based on radiation with the first wavelength reflected from the object surface (16) and the second measurement value is based on radiation with the second wavelength reflected from the object surface (16), characterized in that the first and second measurement values ​​are each distance values ​​to the object surface (16) and are determined by triangulation, wherein the detection device (31) comprises an optical separating element (36) to divide the radiation reflected from the object surface (16) into a first and a second radiation component (40, 44), wherein the detection device (31) comprises a photosensitive unit (34),wherein the radiation components (40, 44) separated by means of the optical separating element (36) strike the photosensitive unit (34) at offset points of impact (42, 46), wherein the optical separating element (36) is a dispersion prism or an objective of the detection device (31) serves as the optical separating element (36).

The scanning gun comprises a grip and a scanning gun body, the front end of the scanning gun body is provided with a light shield, the rear end of the scanning gun body is provided with a back sealing cover, and a camera module, an emission light source module, a spectrometer module, a power supply module and a communication module are sequentially arranged in the scanning gun body from top to bottom. A main control circuit board is arranged on the inner side of the back sealing cover, the main control circuit board is connected with a camera module, an emission light source module, a spectrograph module, a communication module and a power module, a control unit and a storage backup unit are arranged on the main control circuit board, and the spectrograph module comprises a packaging shell. A light incident plate, a collimating lens, a prism group and an analog-to-digital converter are sequentially arranged in the packaging shell from front to back, the prism group comprises a prism frame, and two incident prisms, two dispersion prisms and two emergent prisms are sequentially arranged on the prism frame from front to back. The resolution and sensitivity of the scanning gun are improved, and spectral data of agricultural products can be directly obtained by scanning the surfaces of the agricultural products.

The invention relates to the technical field of spliced telescopes, in particular to a spliced mirror surface correction method based on spectral dispersion fringes, which comprises the following steps of: filtering one or more specific wavebands of incident light through a band-stop filter, so that a known position spectral band gap appears on the spectrum of the incident light; incident light is utilized to irradiate splicing seams or splicing seam intersection points on the spliced mirror surface, and a dispersion prism is arranged on a reflected light path to perform dispersion on reflected light; interference is carried out on the dispersion light, interference fringes with different wavelengths are expanded in the direction perpendicular to dispersion, and two-dimensional interference fringes of a plurality of sub-mirrors are obtained; the spectral band gaps on the two-dimensional interference fringes of each sub-mirror are aligned by adjusting the poses of the plurality of sub-mirrors, so that the pose correction of the sub-mirror adjacent to the splicing seam or the splicing seam intersection point is completed; and each splicing seam or splicing seam intersection point on the spliced mirror surface is irradiated in sequence, so that the pose correction of all the sub-mirrors can be completed.

The invention discloses a method and a device for calibrating the spinning direction of a dispersion prism. The method comprises the following steps: placing a dispersed prism, a plane mirror and a theodolite according to a measurement light path; the angles of the theodolite, the accurate measuring mirror and the plane mirror are adjusted, so that an auto-collimation image reflected by the plane mirror coincides with a cross wire in an eyepiece of the theodolite, and an initial angle is obtained; fitting the geometrical shapes of the rear surface, the front surface and the front end surface of the dispersion prism by using a plurality of points to obtain a first spherical surface, a second spherical surface and a first plane; fitting a second plane where the dispersion prism is located; based on the initial angle, adjusting the angles of the accurate measuring mirror, the theodolite and the plane mirror, so that an auto-collimation image returned by the plane mirror coincides with a cross wire of the theodolite; and measuring a target included angle between the second plane and the fourth plane, and taking the target included angle as a final calibration value of the spinning direction of the dispersion prism. According to the method, the reference of the spinning direction of the dispersion prism is led to the accurate measurement lens, so that the calibration precision of the spinning direction and the adjustment efficiency of the dispersion prism are improved.

The invention discloses a compact interference spectrum measurement device and method based on a catadioptric angle cutter. The device comprises an optical fiber light source, a collimator objective, a composite dispersion prism, the catadioptric angle cutter, a cylindrical lens and a linear array detector which are sequentially arranged in the direction of an optical axis. Incident light is collimated to form parallel light, and the parallel light firstly passes through the composite dispersion prism; the composite dispersion prism is used for dispersing collimated light beams with different wavelengths into light beams with small angle difference, dispersion light enters the catadioptric angle clipper, and in the propagation process, due to different parity of reflection times, shearing inversion is generated in the direction of an emergent wave surface, dispersion directions are symmetrical, and equivalent spatial heterodyne interference modulation is realized; and the two beams of coherent light form interference fringes on the detector after being focused by the cylindrical lens. The device can achieve the spatial heterodyne effect through a single dispersion element, is compact in structure, easy and convenient to debug, high in light energy utilization rate and suitable for point spectrum high-resolution measurement scenes of Raman, fluorescence, absorption and other weak signals.

The invention relates to the technical field of optical imaging, and provides a snapshot type spectral imaging device and method, equipment, a storage medium and a product, and the snapshot type spectral imaging device comprises a detected object; the dispersion prism unit is used for generating spectral dispersion for a detected object to obtain first spectral information; the coding aperture unit is used for carrying out coding modulation on the first spectral information to obtain second spectral information; the dispersion projection unit is used for performing radiation projection on the second spectral information to obtain third spectral information; the dispersion projection unit and the dispersion prism unit are of a symmetrical structure to ensure that aberrations at two ends of the coding aperture unit are consistent; and the detector and the calculation unit are used for receiving the third spectral information and performing spectral recovery on the detection data based on spatial variation aberration overlap-add analysis to obtain a target spectral image. According to the invention, while the dispersion resolution and the measurement precision are ensured, the spatial resolution and the spectral accuracy of spectral imaging are improved.

The invention relates to a push-broom hyperspectral imaging system for an unmanned aerial vehicle, and the system is characterized in that a line-plane combined diaphragm is provided with a slit and a rectangular window, a front lens images a target scene to the rectangular window, the target scene is collimated by a collimating lens to generate parallel light, the parallel light does not undergo dispersion after passing through a dispersion prism, and finally the parallel light reaches a focal plane detector through a focusing lens; high-resolution images are obtained, and pose change information is obtained by comparing the high-resolution images between adjacent frames; the front lens is also used for imaging a target scene to the slit, the target scene is collimated by the collimating lens to generate parallel light, the parallel light is dispersed by the dispersing prism, and finally the parallel light reaches the focal plane detector through the focusing lens to obtain a multispectral image; and calibrating the multispectral image of the current frame by using the pose change information, and splicing after calibration to obtain a final hyperspectral image of the target scene. The system is simple in structure and easy to use, and does not need an additional system to assist in image splicing.

The invention relates to a picosecond Raman laser based on a heavy water-air heterogeneous interface asymmetric cavity, which is characterized in that laser beams output by an excitation source are subjected to frequency doubling conversion through a nonlinear crystal to generate second harmonics as pump light for stimulated Raman scattering; the reflector M1 filters residual fundamental frequency light, and the reflector M2 guides the pump light to be vertically focused to the sample cell through the lens. An observation screen is arranged behind the sample pool to display light intensity distribution, pump light is reflected by the light path adjusting system to be horizontally focused into the sample pool, and output light is guided to a wavelength separation system composed of a dispersion prism and a dichroscope through a notch reflector. According to the signal detection system, pumping energy is monitored through a power energy meter, a stimulated Raman scattering signal (SRS) is coupled to a spectrograph through a multimode optical fiber, an ultrafast detector is matched with an oscilloscope to record pulse waveforms, light path collimation is achieved through a translation table and a rotating base, and multi-dimensional characterization is completed. The device has the advantages of high wavelength conversion efficiency and good sensitivity, and can be used for spectral analysis, substance detection and the like.

Methodology for reducing the linewidth of a multimode diode laser across a wide range of operating wavelengths that maintains high output power is based on retroreflective feedback introduced by a combination of a dispersive prism and a thin optical etalon and that provides high degree of operational flexibility over the use of a volume Bragg grating. An external cavity created by the etalon introduces spectral selectivity with a period equal to the etalon's free spectral range and covers a spectral range including both visible and near-infrared regions. The spectral selectivity caused by the prism reduces the linewidth more than 10-fold to 100 pm and below for different etalon thicknesses and operating currents in the presence of temperature fluctuations.

The application discloses a pulse compressor and a pulse compression method. The pulse compressor comprises: a grating, which is used for diffracting a stretched pulse incident on a first side of the grating to obtain first diffracted light and compensating second-order dispersion of the stretched pulse; a prism assembly, which is located on a second side of the grating and is used for refracting the first diffracted light to obtain refracted light and eliminating third-order dispersion of the stretched pulse while again compensating the second-order dispersion of the stretched pulse; a reflection assembly, which is used for reflecting the refracted light to obtain reflected light, and is used for diffracting the reflected light in the grating again after the reflected light is refracted in the prism assembly, to obtain second diffracted light parallel to the first side of the grating; and a first mirror, which is used for reflecting the second diffracted light to return and be parallel to the first diffracted light, so that the stretched pulse generates a doubled dispersion amount and the spot of the stretched pulse is restored to an initial state. According to the pulse compressor, the occupied space of the pulse compressor can be reduced, and the pulse compressor is easy to integrate.

The utility model provides a miniature grating spectrometer based on a smartphone, which belongs to the technical field of spectrum acquisition and analysis, and comprises a device body, a first groove, a dispersion prism, a second fixing block, an echelle grating, an echelle grating, a second fixing block, a third fixing block, a fourth fixing block, a fifth fixing block and a sixth fixing block, wherein the first groove is formed in the top end of the device body; the stability and the correct position of the dispersion prism and other optical elements in the device are ensured, the echelle grating is a transparent medium with a periodic structure and can generate an optical path difference according to the wavelength of incident light so as to realize diffraction or light splitting of light, and in the device, the echelle grating is arranged at one side end of the second fixing block and is used for fixing the dispersion prism and the other optical elements. The optical elements can be used for further processing light rays dispersed by the dispersion prism, and correct alignment between the optical elements is ensured through accurate position control and fixation, which is crucial for obtaining clear optical images or realizing specific optical functions.

The present invention relates to a dispersion compensation DMD projection method, comprising the following steps: projecting a light beam containing different wavelengths emitted by a projection light source onto a dispersion prism, so that the light beams of different wavelengths are irradiated on the DMD at different incident angles; controlling the states of each micromirror on the DMD according to the desired projected pattern; the DMD reflects the light beams of different wavelengths projected onto the surface of the DMD, and the light beams of different wavelengths at different incident angles are reflected by the DMD and are emitted at the same exit angle; the light beams of different wavelengths at different incident angles reflected by the DMD form the desired multi-wavelength pattern for projection at the projection surface position after passing through the projection objective lens. Compared with the prior art, the present invention proposes a dispersion compensation technology for the first time, and uses a dispersion prism to offset the dispersion generated by the projection light beam and the dispersion caused by the diffraction effect of the DMD, which has the advantages of higher light extraction efficiency, high projection color reproduction, complete spectral information, and clearer patterns.

A spectrally shearing optical relay system, said relay system being comprised of two halves disposed symmetrically about an aperture stop S, wherein each half comprises a plurality of rotationally symmetric optical elements forming an objective and a com-pound prism comprised of a plurality of dispersing prisms. The compound prisms are located between the objectives and the aperture stop. An imaging device with such an optical relay system is also proposed.