202 results about "Diffraction efficiency" patented technology

The present invention relates to a transmission grating and a preparation method therefor. The transmission grating comprises: a substrate, which has a first surface; a grating layer, which comprises trapezoidal grating teeth arranged in an array on the first surface, wherein the grating teeth extend in the direction of thickness of the substrate, and a gap is provided between two adjacent grating teeth; and a dielectric layer, which is arranged on a surface of the grating layer and fills the gaps, wherein the dielectric layer has a second surface on the side thereof away from the substrate; there is a difference between the height of the grating teeth and the distance between the second surface and the first surface, the difference being m; and incident light passes through the interior of the grating layer and is incident towards the second surface. By means of the design of a film layer structure and film layer dimensions of the transmission grating, the present invention can acquire transmission gratings having different diffraction efficiencies and polarization degrees, and can accurately control the dimensions of the film layer structure of the transmission grating during machining, thereby facilitating machining.

The application relates to a kind of diffractive optical element beam shaping methods based on spatial frequency filtering, obtain incident light beam, based on the homogenization light beam of preset, obtain corresponding geometric analytical phase distribution;Adjust the homogenization light beam to rectangular flat-top light beam, the phase correction processing of obtained geometric analytical phase;Based on spatial frequency filtering method processing the geometric analytical phase after phase correction, get the light field regulation and control distribution requirement after processing, the light field regulation and control distribution requirement after processing has phase and amplitude regulation and control requirement simultaneously;Design diffractive optical element, make it realize the light field regulation and control distribution requirement required, and utilize the diffractive optical element to realize the incident light beam shaping as the rectangular flat-top light beam.The application can realize the light beam homogenization effect of high uniformity, edge sharp and high diffraction efficiency, and obtain wide application prospect in laser welding, photoetching and biomedical and other aspects.

The invention discloses a PVG optical waveguide diffraction efficiency uniformity detection method and system, and aims to provide a scheme for comprehensively evaluating optical waveguide diffraction efficiency uniformity and polarization characteristic evaluation, and the method comprises the following steps: constructing and configuring a light source; image acquisition and preprocessing; performing diffraction efficiency analysis and uniformity evaluation; identifying defects; fusing multi-view results; verifying polarization response consistency; and generating a detection report containing the diffraction efficiency heat map of the optical waveguide to be detected, defect distribution and a polarization response curve. On the premise that the structure of the optical waveguide is not damaged, diffraction efficiency uniformity quantification, polarization consistency evaluation and defect identification of the optical waveguide in the whole field of view are achieved, the diffraction performance of the optical waveguide is evaluated globally, the detection accuracy, stability and automation level of a waveguide device are remarkably improved, and the detection efficiency is improved. Efficient and standardized technical support is provided for design, manufacturing and quality control of the optical waveguide, and a key quality control means is further provided for industrialized mass production of AR near-to-eye display modules.

The application belongs to the field of spectral measurement and imaging, and specifically discloses a single-photon detection device and a rapid spectral and imaging system based on the same. According to the application, a transmission optical fiber spectrometer separates each waveband complex light according to wavelength in space, and couples the photons of different wavelengths into an optical fiber array for time delay, so that the different wavelengths are delayed to different time points and output to a single-photon detection device. The single-photon detection device converts the photons of different wavelengths arriving at the device in time sequence into electrical signals, and obtains the number of photons at different time points after amplification and signal processing, and converts the number of photons into a spectrum. Since the transmission spectrometer can provide higher diffraction efficiency, higher spectral resolution and signal strength, the single-photon detection device can provide a faster and more accurate photon discrimination and photon counting method, and compared with the prior art, the whole can measure the spectrum more quickly, and has higher spectral resolution and signal strength.

This application discloses a method and system for synchronous testing of metasurface grating waveguide performance, relating to the field of metasurface grating technology. The method includes polarization state modulation and spatial frequency encoding of multi-wavelength incident beams to obtain a modulated incident light field; coupling this modulated incident light field into the metasurface grating waveguide under test, which then undergoes total internal reflection to form the outgoing light field; acquiring a raw dataset of the entire light field, including Stokes polarization images and spatial spectrum images corresponding to each wavelength of the outgoing beam; calculating the total internal reflection hop count based on the Stokes polarization image; calculating the spatial step size offset based on the spatial spectrum image; and establishing a mapping relationship between the image pixel coordinates of the raw dataset and the internal physical regions of the metasurface grating waveguide under test to obtain local diffraction efficiency distribution data. This application solves the problem that traditional outgoing end intensity testing is difficult to trace to local defects inside the waveguide, achieving synchronous, high-precision quantitative characterization of local diffraction efficiency across multiple wavelengths.

A transparent wood surface imprinting optical device is provided. A preparation method for the device includes cleaning and drying surfaces of transparent wood, spin-coating polymethyl methacrylate (PMMA) on a substrate of the transparent wood to obtain a PMMA layer, and spin-coating an ultraviolet (UV) glue on the PMMA layer to obtain a UV glue layer; placing the transparent wood on a silicon wafer, attaching a transparent grating array imprinting template on the UV glue layer, exposing the UV glue layer, and removing the transparent grating array imprinting after the exposing, thereby to obtain a grating-structure-based transparent wood; and replacing the grating structure imprinting template by a lattice structure imprinting template to prepare lattice-structure-based transparent wood. The diffraction efficiency of the grating structure and the lattice structure on the transparent wood are greater and more stable than those of PMMA substrates.

The application relates to the technical field of micro-nano machining, and discloses a kind of optical waveguide manufacturing template and its processing method, working template and diffractive optical waveguide manufacturing method.The optical waveguide manufacturing template includes template base and etching layer arranged on the surface of the template base, at least two groups of optical waveguide microstructures are arranged on the etching layer, and the depth of each group of optical waveguide microstructures is different.The thickness of the etching layer is configured to be able to meet the maximum design depth of each group of optical waveguide microstructures.The bottoms of different groups of optical waveguide microstructures are flush, and the tops are not flush.After implementing the technical scheme of the application, the technical problems of the prior art, such as complicated processing technology of multi-depth optical waveguide microstructure template, high overlay precision requirement, high manufacturing cost, low yield, low diffraction efficiency of depth microstructure due to imprinting residual glue during processing and poor display effect, are solved.

The polarization diffraction spectrometer comprises a substrate and a plurality of rectangular nano-columns arranged on the substrate, the rectangular nano-columns are periodically stacked or arranged in the height direction to form a periodic superlattice unit, and the substrate layer is made of a nanoscale transparent medium material; according to a grating equation, the optimal diffraction series, the period length and the incident light wavelength of the super grating are selected through experimental simulation, and optimal structural parameters are determined by combining an electromagnetic simulation tool and an optimization algorithm; the heights, the widths and the intervals of the rectangular nanocolumns serve as parameters of a particle swarm optimization algorithm, a fitness function with target diffraction order energy concentration ratio and target order overall diffraction efficiency optimization serving as core indexes is constructed, full-wave optical simulation software is combined, and geometric distribution in periodic units of the rectangular nanocolumns is optimized and adjusted. According to the invention, under the incident condition of 45-degree linearly polarized light, the S polarization component and the P polarization component are respectively concentrated at the preset target diffraction order, and an efficient diffraction light splitting effect is achieved.

The invention discloses a liquid crystal composition which comprises at least one of compounds in a general formula I, at least one of compounds in a general formula II and at least one of compounds in a general formula III. According to the invention, the liquid crystal composition has a high refractive index. Specifically, the compound as shown in the general formula I can increase the intersolubility of the liquid crystal composition while providing a relatively high refractive index for the liquid crystal composition, and has good stability to both photoelectricity and thermoelectricity; the compound in the general formula II can keep good solubility with other compounds while providing a relatively high refractive index for the liquid crystal composition; and the compound in the general formula III is an ester liquid crystal monomer compound, so that the liquid crystal composition has more diversity, and the stability of the whole liquid crystal system is higher. The invention also discloses a holographic polymer dispersed liquid crystal grating which has higher diffraction efficiency and refractive index modulation degree.

A diffractive optical waveguide and a display device having the same are disclosed. The diffractive optical waveguide includes a grating structure formed on a surface of a waveguide substrate, the grating structure including a plurality of grating lines arranged in a plane, the grating lines each extending along a first direction in the plane and arranged at a predetermined interval in a second direction perpendicular to the first direction; at least one sidewall of each grating line having a periodic structure along the first direction; and the grating structure configured to diffract light incident thereon at a non-zero angle with respect to the plane out of the plane through a predetermined diffraction order. The grating structure employed in the above-described diffractive optical waveguide can be used to adjust the diffraction efficiency at different angles and / or different diffraction orders, thereby providing a new effective and flexible means for improving the angular uniformity and / or the out-coupling efficiency of the diffractive optical waveguide.

The invention relates to the field of precision optical element detection, in particular to a grating diffraction efficiency full-breadth measurement method and system based on double optical paths, and the method comprises the steps: firstly simulating a Littrow angle return optical path through a standard reflector, and respectively measuring the intensity of direct reflection light and the intensity of light attenuated by a beam splitter through a measurement light detector; and calculating to obtain a reverse beam splitting ratio for correcting secondary attenuation of the beam splitter. On the basis, forward beam splitting ratio calibration is carried out, reference light intensity and diffraction light intensity are synchronously collected under the Littrow angle, and the diffraction efficiency of the grating under the Littrow configuration can be accurately calculated by combining two calibration parameters and real-time measurement data. In order to realize full-breadth measurement, the grating is placed on a two-dimensional translation table for snakelike scanning, a control unit coordinates movement and data acquisition, and finally a diffraction efficiency distribution diagram is generated through data processing. According to the invention, system errors in Littrow measurement are effectively eliminated, and full-breadth, high-efficiency and high-precision automatic detection is realized.

The application discloses a phase mask plate preparation method for inhibiting a Fabry-Perot effect, and comprises the following steps: a dispersion fiber grating model is established, and reflection spectrum, transmission spectrum and group delay curve of the dispersion fiber grating are obtained through simulation; an ultra-Gaussian cut-off function model is established; according to the reflection spectrum and the transmission spectrum of the dispersion fiber grating and the ultra-Gaussian cut-off function, the reflection spectrum, the transmission spectrum and the group delay curve of the optimized dispersion fiber grating are obtained through simulation, and then a refractive index modulation depth distribution curve of a grating area of the phase mask plate is obtained; the refractive index modulation depth distribution curve of the grating area of the phase mask plate is optimized to obtain an optimized refractive index modulation depth distribution curve; a diffraction efficiency distribution curve and a groove depth of the phase mask plate are calculated; and the phase mask plate is obtained according to the groove depth of the phase mask plate. According to the application, the groove depth distribution of the phase mask plate used for writing is only adjusted, the Fabry-Perot effect can be effectively inhibited, and therefore the reflection spectrum flatness of the dispersion fiber grating is improved.

The application discloses a plane grating full-parameter testing system and a measuring method. The system comprises a light source system, a double-layer rotating motion system, a phase-locked system, a monitoring system and a measurement and control system. The light source system comprises an adjustable monochromatic light source module and a frequency-stabilized narrow-line-width laser module. The adjustable monochromatic light source is used for diffraction efficiency measurement, and the frequency-stabilized narrow-line-width laser is used for stray light and period measurement. The double-layer rotating motion system is used for separately controlling a to-be-measured grating and a detector, and is used for angle and translation adjustment. The phase-locked system is used for weak signal measurement. The monitoring system is used for accurately positioning a grating rotation angle. The measurement and control system is used for completing light source control, motion control, signal acquisition, parameter calculation and result output. The application can realize integrated measurement of plane grating diffraction efficiency, stray light and period parameters.

This invention discloses a crosstalk suppression method and a wavelength selective switch, belonging to the field of optical communication technology. Addressing the problems in existing technologies where the first-order diffraction efficiency of the phase diffraction grating formed on the LCoS surface of a silicon-based liquid crystal (LCoS) affects the insertion loss and increases signal crosstalk in WSSs, this invention provides a crosstalk suppression method and a wavelength selective switch. Along the beam direction, the switch consists of an ITO glass layer, an alignment layer, a liquid crystal region layer, another alignment layer, and a high-reflectivity layer. By altering the beam phase through the ITO glass, liquid crystal region layer, and high-reflectivity layer, and by setting a phase diffraction grating with a specific period, the beam direction of different wavelengths is deflected, thereby achieving port switching and effectively avoiding signal crosstalk between ports.

The invention discloses a photopolymer material, application thereof and a volume holographic grating, and relates to the technical field of polymer photosensitive materials. The photopolymer material comprises the following raw materials: a binder, an active monomer, a photoinitiator, a photosensitizer, a hydrogen donor and a sensitizer, the molar ratio of the active monomer to the photoinitiator is (8-12): 1; the molar ratio of the photosensitizer to the photoinitiator is 1: (15-25); the active monomer comprises a high-refractive-index monomer with the refractive index of 1.55-1.72 and a low-refractive-index monomer with the refractive index of 1.44-1.50, and the molar ratio of the high-refractive-index monomer to the low-refractive-index monomer is (0.7-1.3): 1. The photopolymer material meeting holographic recording can be prepared, and the prepared material is good in heat resistance, rapid in film forming, short in oxygen isolation exposure response time (as long as several seconds), high in refractive index modulation degree, high in sensitivity, high in diffraction efficiency, good in mechanical property and high in transmittance and can be prepared in a large area.

The utility model is applicable to the technical field of grating waveguides, and provides a grating waveguide and a near-to-eye display system, a coupling-in element, a first polarization reflection device, a coupling-out element and a second polarization reflection device are sequentially arranged on a waveguide base body at intervals, so that external first polarization light rays enter the waveguide base body through the coupling-in element to be transmitted; the light passes through the coupling-out element for four times to form four coupled-out light and four non-coupled-out light, the four coupled-out light is emitted out of the waveguide substrate to be projected to the eyes of a user, the diffraction efficiency of the coupled-out light is effectively improved, the first three non-coupled-out light continues to be propagated in the waveguide substrate, and the diffraction efficiency of the coupled-out light is effectively improved. Only the fourth non-coupled light is leaked from one side of the waveguide substrate, so that the diffraction efficiency of the non-coupled light is improved, the leakage proportion of the non-coupled light is reduced, and the diffraction efficiency of the grating waveguide is improved on the whole.

The invention relates to the technical field of gratings, in particular to a metal wire grating structure and a preparation method thereof.The metal wire grating structure comprises a substrate, a reflecting layer, a transparent dielectric layer and a metal grating layer which are sequentially stacked from bottom to top; wherein the thickness of the metal grating layer is not greater than 30nm; when incident light irradiates the metal wire grating structure from the side, away from the transparent dielectric layer, of the metal grating layer, part of the incident light is directly reflected by the metal grating layer to form a first path of reflected light, and the remaining part of the incident light enters the transparent dielectric layer through intervals between the metal wires. And after being reflected by the reflecting layer, the first path of reflected light is emitted out again through the transparent dielectric layer and the interval between the metal wires to form a second path of reflected light, and the phase difference between the first path of reflected light and the second path of reflected light is odd times of pi. According to the invention, the anti-pollution capability and the anti-wear capability of the grating are improved at least on the premise of ensuring that the grating has relatively high diffraction efficiency.

A multi-focal ophthalmic lens using suppressed diffraction orders. A multi-focal ophthalmic lens includes an ophthalmic lens and a diffractive element. The ophthalmic lens has a base curvature corresponding to a base power. The diffractive element produces constructive interference in at least four consecutive diffraction orders corresponding to a range of vision between near vision and distance vision. The constructive interference produces a near focus point, a distance focus point, and an intermediate focus point between the near focus point and the distance focus point corresponding to the base power of the ophthalmic lens. The diffraction efficiency of at least one of the diffraction orders is suppressed to less than 10%.

Disclosed is a single photon detection device comprises a photodetection layer including a first surface and a second surface positioned opposite to each other. The photodetection layer comprises a first well having a first conductivity type, diffraction patterns positioned between the second surface and the first well, the diffraction patterns configured to receive incident light and diffract the incident light such that first-order diffracted light has a highest diffraction efficiency in a red or near-infrared wavelength band; a highly doped region positioned between the first surface and the first well and having a second conductivity type different from the first conductivity type, and a contact region electrically connected to the first well and having the first conductivity type.

The invention discloses a method for improving the uniformity of an optical waveguide imaging picture and an optical waveguide, and relates to the technical field of optics, and the method comprises the steps: obtaining a brightness diagram of an image outputted by the optical waveguide through a test device; obtaining the brightness distribution condition of the image according to the brightness map; determining film coating parameters according to the brightness distribution condition, wherein the film coating parameters comprise a film coating area, a film coating thickness, a film coating type and a film coating layer number; selective coating is carried out on a grating area corresponding to the optical waveguide according to the coating parameters, so that compensation areas with different diffraction efficiencies are formed; and repeating the steps until the brightness uniformity of the optical waveguide reaches a target value. According to the method for improving the uniformity of the imaging picture of the optical waveguide and the optical waveguide, the original structural design of the grating does not need to be changed, accurate compensation is achieved through regionalized selective coating in the post-processing stage, and various AR waveguide products needing the high-uniformity display effect can be effectively adapted.

The present application relates to the field of precise optical element detection, and more particularly to a grating diffraction efficiency full-aperture measurement method and system based on double optical paths, which first simulates Littrow angle return light path by using a standard mirror, measures direct reflected light intensity and light intensity after attenuated by a beam splitter through a light detector, and calculates a reverse beam splitter ratio for correcting secondary attenuation of the beam splitter. On this basis, forward beam splitter ratio calibration is performed, and reference light intensity and diffraction light intensity are synchronously collected at Littrow angle. Through combining two calibration parameters and real-time measurement data, diffraction efficiency of the grating under Littrow configuration can be accurately calculated. To realize full-aperture measurement, the grating is placed on a two-dimensional translation stage for serpentine scanning, and motion and data collection are coordinated by a control unit. Finally, a diffraction efficiency distribution map is generated through data processing. The present application effectively eliminates system error in Littrow measurement, and realizes full-aperture, high-efficiency, high-precision and automatic detection.

The invention relates to an optical system (10a) for a virtual retinal display having an illumination device (12). The lighting device (12) has a first laser diode (7) for emitting a first light beam (8) in a first wavelength range. The first wavelength range is shifted towards a second wavelength range depending on the temperature of the first laser diode (7). Furthermore, the optical system (10a) has a first controllable deflection unit (9) for the first light beam (8) for the scanning projection of the image content. Furthermore, the optical system (10a) has a holographic optical element (5) for deflecting the first light beam (8) onto the eye (3). The holographic optical element (5) is formed from a liquid crystal and has a first holographic function with a first diffraction efficiency range and a second holographic function with a second diffraction efficiency range. The first wavelength range at least partially overlaps a first diffraction efficiency range and the second wavelength range at least partially overlaps a second diffraction efficiency range. Furthermore, the optical system (10a) has a control unit (11) for actuating the holographic optical element (5) or the polarization switch in such a way as to depend on detected information relating to a first or second wavelength range of the emitted first light beam (8), the holographic optical element (5) is arranged such that a first light beam (8) having a first wavelength and incident on the holographic optical element (5) at a first point in time at a first angle of incidence (15) and a first light beam (8) having a second wavelength and incident on the holographic optical element (5) at a second point in time following the first point in time at the first angle of incidence (15) are deflected onto the eye (3).

This invention provides a photopolymer composition, a holographic film, and a volume holographic grating. The photopolymer composition of this invention comprises a polymer matrix, a photopolymerizable monomer, and a photoinitiator; the polymer matrix comprises linear polyurethane, and the photopolymerizable monomer comprises a compound represented by Formula I. By using linear polyurethane as the polyurethane matrix and a compound represented by Formula I as the photopolymerizable monomer, the photopolymer composition of this invention possesses high refractive index modulation capability and low viscosity, enabling the formation of a holographic film with uniform material distribution, thereby achieving high diffraction efficiency in the volume holographic grating.

The invention discloses a structural material centrosymmetric double-embossment beam combining grating for the central wavelength of 1064 nanometers. The beam combining grating comprises a quartz substrate, a high-reflective film system, a matching layer, two non-centrosymmetric embossments, a lower embossment, an upper embossment and a filling layer between the two embossments which are sequentially plated from bottom to top. The filling layer can be filled by plating Ta2O5, or is filled by air. Under the action of different fillers, the following effects can be realized: under the filling of Ta2O5, under TE polarization, in the bandwidth of 1051-1070.3 nm, the incident-grade 1 diffraction efficiency is greater than 99% at 38.49 degrees, and the highest diffraction efficiency can reach 99.9%; under air filling, under TE polarization, within the bandwidth of 1030-1094.5 nanometers, 38.49-degree incidence-1-level diffraction efficiency is larger than 99%, the highest diffraction efficiency can reach 99.9%, the material has important application value in the fields of high-energy spectrum beam combining laser and ultra-strong and ultra-short laser pulse compression, meanwhile, the material has extremely high structural freedom degree, and the material is suitable for being used in the field of high-energy spectrum beam combining laser and ultra-strong and ultra-short laser pulse compression. And various application scenes in beam combination can be adapted by regulating and controlling the structure.

A waveguide for use in an augmented reality or virtual reality display comprises a plurality of optical structures in or on a photonic crystal. The plurality of optical structures are arranged in an array to provide two diffractive optical elements overlaid on one another in the waveguide. Each of the two diffractive optical elements is configured to receive light from an input direction and couple it towards the other diffractive optical element which can then act as an output diffractive optical element, providing outcoupled orders towards a viewer. The plurality of optical structures have different respective cross sectional shapes, for a cross section parallel to the plane of the waveguide, at different positions in the array in order to provide different diffraction efficiencies at different positions in the array.

The invention discloses a spectrometer optical path structure based on photoacoustic composite film thickness detection, a mechanical device and an adjustment method thereof, and relates to the technical field of optical coherence tomography. The light path structure comprises a collimating lens group used for collimating an incident light beam into parallel light; the reflecting element is obliquely arranged and is used for reflecting the collimated light beam; and the grating element is used for splitting the reflected light beam. An achromatic collimating lens group, a high-diffraction-efficiency body phase holographic grating and a glass material with an extremely low dispersion coefficient are used as focusing lenses to build a light path structure, through precise optical design, the RMS radius of a light spot with a single wavelength is optimized to be close to a diffraction limit, more than 95% of light energy is concentrated in a tiny area, and the light path structure is optimized to be uniform. The extremely high energy concentration ratio effectively reduces the requirement for the pixel size of the camera, the overall signal-to-noise ratio and spectral resolution of the system are remarkably improved, and the inherent disadvantages that an infrared indium gallium arsenic camera is small in pixel and low in signal-to-noise ratio are successfully overcome.

The invention provides a holographic polymer dispersed liquid crystal material, a grating device and a preparation method thereof, in a holographic polymer dispersed liquid crystal material system, uniformly dispersed zirconium dioxide nano-particles are introduced into a writing monomer according to a specific proportion, and the zirconium dioxide nano-particles are used as a nano reinforced phase to be stably combined with a photopolymer matrix; the composition and proportion of the writing monomers are synergistically optimized, and the multiple beneficial effects of improving the thermo-oxidative aging resistance of the grating device, enhancing the grating structure stability and improving the diffraction efficiency are synchronously achieved through material compounding and structure strengthening. Specifically, in the preparation process, a PGME dispersion liquid of zirconium dioxide nanoparticles and a writing monomer are preferentially and uniformly mixed, and a PGME solvent is removed by virtue of a rotary evaporation technology, so that highly uniform and stable pre-dispersion of the nanoparticles in a writing monomer matrix is realized; the problems of agglomeration and sedimentation possibly caused by compatibility difference in the subsequent integral mixing and polymerization process of the nano-particles are prevented.

The invention provides a double-layer uniform emission grating antenna structure for an optical phased array. Comprising a substrate, a waveguide layer and a cladding, the SOI substrate comprises a substrate layer and a buried oxide layer, the waveguide layer comprises a lower-layer silicon waveguide and an upper-layer silicon nitride waveguide, the upper-layer silicon nitride waveguide is provided with a grating structure formed by etching in the light propagation direction, and the grating structure is formed by modulating the transverse width of an etching area and the grating duty ratio. And near-field uniform radiation of light energy in the waveguide is realized, so that a fishbone-like grating antenna is formed. According to the double-layer grating structure provided by the invention, the characteristics of strong light limitation of the silicon waveguide and weak disturbance of full etching of the silicon nitride waveguide are utilized, the etching difficulty is reduced, the effective length of the grating is effectively prolonged, so that the far-field emission angle of a light beam is reduced, the wavelength tuning efficiency and the upward diffraction efficiency are relatively high, the structure is simple, and the manufacturing difficulty is relatively low.

The present application relates to a kind of small light weight long-wave infrared continuous zoom optical system, by the coaxial arrangement of first meniscus positive lens, double-concave negative lens, biconvex positive lens, first meniscus negative lens, second meniscus positive lens, second meniscus negative lens in order from object side to image side, double-concave negative lens is variable magnification lens, biconvex positive lens is compensation lens. Through the reasonable distribution of the refractive power of each lens and the optimized setting of aspheric surface position, while realizing the continuous zooming in the range of 22mm~88mm, the imaging quality is high, there is no jamming phenomenon in the zooming process, and it does not contain diffraction surface, so as to avoid the problem of optical system transmittance decline caused by diffraction efficiency loss, thereby improving the system throughput and sensitivity;The system is adapted to the long-wave infrared detector with resolution of 1024x768 and pixel pitch of 12 μm, and the length is short, the weight is light, the total length of the system is 135mm, and the total weight of the 6 lenses is 300g, which is beneficial to realize miniaturization and light weight.

This invention relates to the field of holographic storage materials technology, specifically to an NVP-doped PQ / PMMA photopolymer holographic storage material and its preparation method. The NVP-doped PQ / PMMA photopolymer holographic storage material uses NVP, MMA, PQ, and AIBN as raw materials. NVP is doped into PQ / PMMA to achieve the photopolymer material as an excellent medium for holographic storage. This material has a simple preparation process, low cost, high diffraction efficiency, and high photosensitivity, making it better suited for holographic imaging and data storage compared to PQ / PMMA.