49 results about "Brewster's angle" patented technology

The invention discloses a device for realizing low-loss work of a long-wave infrared femtosecond optical parametric oscillator, which belongs to the field of optical parametric oscillators and comprises a pumping source, a pumping focusing lens, a long-wave infrared nonlinear crystal cut at a Brewster angle, a laser medium dichroscope and an output coupling mirror. Wherein the nonlinear crystal meets the I-type phase matching condition for the optical parameter process, and the front and rear surfaces of the crystal cut the central wavelength of the oscillated signal pulse at a Brewster angle so as to reduce the loss of the pulse in the resonant cavity. According to the long-wave infrared femtosecond optical parametric oscillator, the limitation of residual loss of a crystal antireflection film is broken through by adopting Brewster angle cutting on the crystal, so that the construction of the femtosecond optical parametric oscillator based on the long-wave infrared nonlinear crystal becomes possible, and the bottleneck of the existing long-wave infrared femtosecond optical parametric oscillator in the aspects of wavelength tuning range, output power and the like is expected to be broken through; and a practical low-cost technical scheme is provided for construction and application of the long-wave infrared femtosecond optical parametric oscillator.

A half-wave plate and a focusing lens are sequentially arranged on an output light path of a pulse width adjustable infrared laser, the focusing lens is connected with a frequency doubling crystal, the frequency doubling crystal is connected with a frequency tripling crystal, the output end face of the frequency tripling crystal is cut into a Brewster angle, and the output end face of the frequency tripling crystal is connected with a pulse width adjustable infrared laser. The output infrared laser is shielded by the infrared light blocking block after being transmitted in the space, the output green laser is shielded by the green light blocking block after being transmitted in the space, the frequency tripling crystal is connected with the imaging lens, the imaging lens is connected with the input surface of the wedge-shaped lens, and the input surface of the wedge-shaped lens is cut into a Brewster angle. Through fine adjustment of the distance between the imaging lens and the frequency tripling crystal and the distance between the wedge-shaped lens and the imaging lens, the ultraviolet laser output by the wedge-shaped lens becomes circular and is output. The Brewster angle output surface of the frequency tripling crystal reduces the ultraviolet damage probability and separates infrared light, green light and ultraviolet light. The position of the imaging lens is finely adjusted to compensate a light spot ellipse caused by a walk-off effect during frequency doubling.

An aircraft radome and radar assembly includes: a radome arranged on the nose of the aircraft; a radar inside the radome, the radar operating in the millimeter domain and including a transmission antenna for emitting a TM polarized wave and a reception antenna; the radome includes an integrated window in front of the radar, the window being of a material transparent to millimeter waves; the radar being arranged so the angle between the maximum gain direction of the transmission antenna and the normal to the window is within an angular range [θB−θ1; θB+θ2], with OB being the Brewster angle for an air / window interface, θ1 and θ2 determined to obtain reflectivity at said air / window interface less than a predefined threshold; and an isolation partition between the transmission antenna and the reception antenna, the isolation partition being substantially in contact with the window and with the radar.

This application provides a green fiber laser, comprising, in sequence, a high repetition rate (PRR) polarization-maintaining fiber laser, a first Brewster window, a second half-wave plate, a first plano-convex lens, a laser crystal, a second plano-convex lens, and a first dichroic mirror. The PPR fiber laser outputs a high repetition rate polarization-maintaining fundamental frequency signal light. The first Brewster window is an optical lens placed at a Brewster angle, and the 1000-1100nm fundamental frequency signal light passing through the first Brewster window has a specific polarization state. The second half-wave plate can be rotated to adjust the polarization state rotation angle of the infrared beam after passing through the first Brewster window. By using the second half-wave plate and the first Brewster window to adjust the polarization state rotation angle to a suitable polarization state, the optical-to-optical conversion efficiency of the entire system is greatly improved, resulting in high repetition rate, high energy conversion efficiency, high power, and stable green light output.

The invention relates to a preparation method and a working method of a trigonal nonlinear optical crystal frequency conversion device, the frequency conversion device is provided with a first group of parallel surfaces and a second group of parallel surfaces, the first group of parallel surfaces are parallel to the c-axis and the a-axis of an optical crystal, the normal of the second group of parallel surfaces and the c-axis form an angle alpha, the included angle between the projection of the normal on the a-b plane and the axis a is beta, the relation shown in the formula 1 and the formula 2 is # imgabs0 # theta PM is the phase matching angle of incident fundamental frequency light and emergent variable frequency light of the nonlinear optical crystal, theta B = arctann and is a Brewster angle, n is the corresponding refractive index of the incident fundamental frequency light of the nonlinear optical crystal, and theta B is the corresponding refractive index of the incident fundamental frequency light of the nonlinear optical crystal. And the second group of parallel surfaces are a light-passing input surface and a light-passing output surface of the frequency conversion device. The invention provides a preparation method and a working method of a nonlinear optical crystal frequency conversion device which has a light-passing direction length as large as possible and is suitable for continuous wave application based on a flaky original crystal.

The utility model discloses a Malus law verification experiment device without a polaroid. The Malus law verification experiment device comprises a light source generator, a first light reflecting body, a second light reflecting body and a light intensity sensing component, the first reflector is used for reflecting initial incident light emitted by the light source generator to the second reflector; the second reflector is used for secondarily reflecting the first reflected light reflected by the first reflector to the light intensity sensing component; initial incident light emitted by the light source generator is reflected by the first reflector to form linearly polarized light, and the linearly polarized light enters the second reflector at a Brewster angle; the second reflector can rotate around the propagation direction of the first reflected light, and in the rotation process, the intensity of light reflected by the second reflector can change along with the change of the rotation angle. According to the application, the discovery history of the Malus law is combined, the defect problem of a traditional Malus law verification scheme is solved, a polaroid is not used any more, the depolarization problem is avoided, and meanwhile the Malus law and the Brewster law can be verified at the same time through the experimental light path used in the application.

The application discloses a Brewster window stack polarization modulation device. The device comprises a Brewster window stack assembly, a clamping assembly, and an installation base. The Brewster window stack assembly comprises a plurality of optical window pieces arranged in parallel and at intervals, and the included angle between the surface normal and the incident light is a Brewster angle. The installation base has a vertical part and a horizontal part. The clamping baffle is arranged opposite to the vertical part of the installation base at intervals. The optical window pieces and the gaskets are alternately arranged in parallel at intervals. One adjusting screw is arranged on each side of the installation base. The adjusting screw passes through the clamping baffle and each gasket in sequence, and is screwed with the vertical part of the installation base. The rotation of the adjusting screw is converted into the linear motion of the clamping baffle along the support surface, so as to change the distance between the clamping baffle and the vertical part and / or realize the clamping and fixing of the Brewster window stack assembly. The device can realize linearly polarized light output with high extinction ratio and high stability in a wide range of incident angles and spectral bands.

This invention discloses a reflective film for automotive applications and a display structure for eliminating ghosting, belonging to the field of automotive displays. It includes a first liquid crystal layer and a second liquid crystal layer. The first liquid crystal layer has a direction pointing in the same direction and a thickness of 1 / 4 waveplate. The second liquid crystal layer is a reflective layer with a spiral structure in the longitudinal direction. The first liquid crystal layer is bonded to the windshield. The reflective film reflects the light beam generated by the display device incident at Brewster's angle inside the vehicle, reducing the energy of the beam that causes ghosting and eliminating it. For natural light from outside the vehicle, it only reflects P-polarized light with a wavelength close to that of the display device, while allowing other wavelengths and polarization directions of natural light to pass through, giving the automotive reflective film both high reflectivity and high transmittance.

The invention relates to the technical field of OTDR (Optical Time Domain Reflectometer), in particular to an optical transceiving integrated device and method for inhibiting an overlarge front-end blind area, and the device comprises a laser which is used for generating test light; the polarization controller is used for adjusting the test light into linearly polarized light only containing an S component; the slide is arranged on the emergent light path of the polarization controller, and the included angle between the normal and the incidence direction of the adjusted test light is a Brewster angle; the detection end of the device is arranged in the direction of a reflection light path of the adjusted test light by the slide and is used for placing an optical fiber to be tested, so that the device emits the test light reflected by the slide to the optical fiber to be tested; enabling the device to receive backward Rayleigh scattering light returned by the optical fiber to be detected; and the avalanche photodiode is arranged on a transmission light path of the slide to the backward Rayleigh scattering light and is used for receiving the backward Rayleigh scattering light penetrating through the slide. Therefore, the advantages of preventing APD supersaturation during short-distance testing and improving the signal-to-noise ratio during long-distance testing are achieved at the same time.

The utility model provides a frequency-doubled laser linewidth narrowing device. The device comprises a pumping module and a laser resonant cavity, the pumping module is used for providing linearly polarized light in a specific polarization direction to a light path; the laser resonant cavity is internally provided with a gain medium, at least one birefringence optical filter and a frequency doubling crystal which are sequentially arranged along an optical path, and the at least one birefringence optical filter is inserted into the optical path at a Brewster angle; wherein the linearly polarized light is focused in the gain medium, the central wavelength of the linearly polarized light is the same as the absorption peak wavelength of the gain medium, and the polarization direction of the linearly polarized light is the same as the maximum absorption direction of the gain medium. According to the invention, the birefringence optical filter (group) inserted into the laser resonant cavity can be specifically adjusted, so that narrow-band filtering can be conveniently and quickly realized in various intracavity frequency doubling lasers, and compared with the prior art, the introduced power loss is relatively small.

The invention provides a monitoring device and a monitoring method for monitoring the quality of a coated photoresist, the monitoring device comprises a transmitting device, a receiving device and two angle adjusting devices, the transmitting device transmits laser containing S polarized light and P polarized light to the surface of the coated photoresist; the receiving device separates S polarized light and P polarized light in the reflected light reflected by the photoresist and respectively receives the S polarized light and the P polarized light; the first angle adjusting device adjusts the angle of the emitting device so as to adjust the included angle between the incident light and the vertical direction. The second angle adjusting device adjusts the included angle between the receiving device and the vertical direction to receive the reflected light. The monitoring device is used for measuring the Brewster angle of the photoresist so as to calculate the refractive index of the photoresist, and the quality of the photoresist is judged on the basis of the mapping relation between the refractive indexes under different Q-times after the photoresist is coated and key parameters and yield of a photoetching process, so that the purpose of monitoring the quality of the coated photoresist is achieved.

The invention discloses a method for manufacturing a reflective film for a vehicle, which belongs to the field of display for the vehicle, and comprises the following steps: treating a substrate, spin-coating an alignment layer, spin-coating a liquid crystal film, separating the liquid crystal film from the substrate, removing the alignment layer, sticking a protective film and the like. A director of the second liquid crystal layer is of a spiral structure in the longitudinal direction, the first liquid crystal layer is attached to a windshield, and the reflecting film reflects light beams generated by a display device incident at the Brewster angle in a vehicle, so that the energy of the light beams forming double images is reduced, and the double images are eliminated. Only P polarized light close to the working wavelength of the display device is reflected for natural light outside a vehicle, and natural light with other wavelengths and polarization directions is transmitted, so that the reflective film for the vehicle has high reflectivity and high transmittance.

The present invention relates to a preparation method for a trigonal nonlinear optical crystal frequency converter and an operating method. The frequency converter has a first group of parallel surfaces and a second group of parallel surfaces, wherein the first group of parallel surfaces is parallel to a c-axis and an a-axis of an optical crystal, an angle α is formed between a normal of the second group of parallel surfaces and the c-axis, and an included angle β is formed between the projection of the normal on an a-b plane and the a-axis; and θPM having a relation shown in Formula (1) and Formula (2) is a phase matching angle of the nonlinear optical crystal satisfying an incident fundamental frequency light and an emergent variable frequency light, where θB=arctann, which is a Brewster angle, n is the refractive index of the nonlinear optical crystal corresponding to the incident fundamental frequency light, and the second group of parallel surfaces includes a light transmission input surface and a light transmission output surface of the frequency converter. The present invention provides, on the basis of a thin sheet-like primary crystal, a preparation method for a nonlinear optical crystal frequency converter having a length in a light transmission direction as large as possible and suitable for continuous wave application and an operating method.

The application relates to a high-power long-service-life continuous short-wave ultraviolet laser generator, characterized in that a semiconductor pumping source is arranged in a pumping light path, pumping light is output through a transmission optical fiber, and the pumping light is coupled to a laser crystal through a collimating and focusing system composed of a collimating mirror and a focusing mirror; a Z-shaped laser resonant cavity composed of an input mirror, a folding cavity mirror one, a folding cavity mirror two and a plane total reflection mirror generates vertically polarized ultraviolet light after passing through a frequency doubling crystal with a temperature control device, the ultraviolet light is reflected to the outside of an output cavity through a harmonic wave piece placed at a Brewster angle, the laser generator can realize 1.5 W ultraviolet laser output, and has the outstanding advantages of compact and stable structure, high output power, long service life, good beam quality and the like.

The present invention relates to a modification method for improving the light absorption of a hybrid perovskite film and enhancing its photoelectrochemical response. The method comprises: applying a perovskite precursor droplet on conductive glass to obtain a hybrid perovskite film; thermally annealing the hybrid perovskite film; and plasma-treating the hybrid perovskite film after the thermal annealing to complete the modification of the hybrid perovskite film. The hybrid perovskite layer modified by plasma exhibits a porous, rough surface. The rough surface of the material can, on the one hand, cause incident light to be reflected and absorbed multiple times within the hybrid perovskite material. On the other hand, the rough surface provides a Brewster angle for specific incident light, thereby improving the material's absorptivity to light at that incident angle. This improves the light absorptivity of the hybrid perovskite material and further improves the photoelectric conversion efficiency of the perovskite layer.

An object of the present invention is to provide a projection image display member capable of reducing a double image even at a projection angle other than a Brewster's angle.SOLUTION: A P-polarized light reflective layer and an absorptive light control layer, wherein an average reflectivity at a wavelength of 400 nm to 700 nm is 5% or more and 100% or less when P-polarized light is incident from the P-polarized light reflective layer side so as to form 60 ° with respect to a normal direction of a surface on the P-polarized light reflective layer side, the projection-image-displaying member satisfies (Tv + Rv) ≤ 95, where Tv (%) is an average transmissivity of wavelengths 400nm to 700nm when p-polarized light is incident perpendicularly to a front face of the projection-image-displaying member from the p-polarized light reflecting layer side, and Rv (%) is an average reflectivity of wavelengths 400nm to 700nm when p-polarized light is incident from the p-polarized light reflecting layer side so as to form an angle of 12 ° with respect to a normal to the front face.SELECTED DRAWING: Figure 4

Provided is a method for measuring the concentration of an optically active substance in aqueous humor and an apparatus for measuring the concentration of an optically active substance, which can measure the concentration of an optically active substance in aqueous humor simply and with high accuracy. The method for measuring the concentration of an optically active substance includes a first step of irradiating incident light, which is polarized light, to the aqueous humor of an eye and measuring the polarization state of reflected light obtained by reflection at the interface between the aqueous humor and the lens, wherein the first incident light is irradiated so that the angle between the normal at the point where the incident light intersects the surface of the lens and the incident light is smaller than the Brewster angle, and the polarization state of the first reflected light is measured; a second step of irradiating second incident light so that the angle of the incident light is equal to or greater than the Brewster angle, and the polarization state of the second reflected light is measured; a third step of calculating the optical rotation of the aqueous humor using the information on the polarization state of the first reflected light and the information on the polarization state of the second reflected light; and a fourth step of calculating the concentration of the optically active substance in the aqueous humor based on the optical rotation of the aqueous humor.

The utility model relates to a device for monitoring the output power of a linear polarization laser in real time, which comprises a carrier, a purification assembly and a power sampling assembly are sequentially arranged on the carrier at intervals along the transmission direction of incident laser, the purification assembly comprises an optical adjusting frame A, and a Brewster polaroid pile is arranged on the optical adjusting frame A; a residual light collector is arranged in a direction in which incident laser is reflected by the Brewster polaroid stack; the power sampling assembly comprises an optical adjusting frame B, a Brewster window sheet is arranged on the optical adjusting frame B, and a power detector is arranged in the direction in which the incident laser is reflected by the Brewster window sheet; the included angle between the mirror surface of the Brewster polarizer stack and the transmission direction of the incident laser is a Brewster angle, and the included angle between the mirror surface of the Brewster window sheet and the transmission direction of the incident laser deviates from the Brewster angle. The device has the advantages of being reasonable in structural design, capable of achieving high-precision and low-interference real-time monitoring of the output power of the linear polarization laser, easy to assemble and debug and the like.

The embodiment of the invention relates to a backlight module, a display panel and a display device, the backlight module comprises at least one layer of transmission medium, a back plate and a light-emitting module, the light-emitting module is arranged on the back plate, and the at least one layer of transmission medium is spaced by a preset distance through a support; light emitted by the light-emitting module enters the at least one layer of transmission medium at a Brewster angle, passes through the at least one layer of transmission medium and then is emitted as linearly polarized light in a target polarization direction. According to the embodiment of the invention, the Brewster angle in the optical technology is effectively utilized, and all or most of the light transmitted through the at least one layer of transmission medium is linearly polarized light, so that the effective control on the polarization state of the light incident to the liquid crystal panel is realized, the emitted linearly polarized light can be completely incident into the liquid crystal panel, and the quality of the liquid crystal panel is improved. And the energy utilization rate of the backlight module is improved.

The application discloses a water surface three-dimensional reconstruction method based on oblique view geometric constraint and attitude blind correction, and belongs to the technical field of precision engineering measurement, computer vision and physical oceanography, and comprises the following steps: acquiring point clouds by oblique scanning of a 905nm laser radar near Brewster angle, removing noises through straight-through filtering and statistical outlier removal, realizing IMU-free attitude leveling based on SVD and Rodrigues formula, taking a preset low quantile of a Z axis as a dynamic reference to perform height normalization, and finally generating a continuous three-dimensional wave surface model through two-dimensional gridding, morphological closing operation and Gaussian smoothing. By using the above method, the low-cost near-infrared laser radar can be used to realize high-precision three-dimensional reconstruction of micro-scale waves without external inertial measurement hardware and physical targets, so that the hardware cost is greatly reduced, and the convenience and precision of non-contact measurement are improved.

A detection device for the transmittance of a thin-film polarizer, belonging to the field of laser technology. The specific solution is as follows: A detection device for the transmittance of a thin-film polarizer includes a test light source, a polarization cube, a rotating table, a mounting seat, a convex lens, and a power meter. The mounting seat is fixedly arranged on the rotating table and their centers coincide. The thin-film polarizer to be tested is arranged on the mounting seat and their centers coincide. The light emitted by the test light source passes through the polarization cube and is incident on the center of the thin-film polarizer to be tested, reflected by the thin-film polarizer to be tested and reaches the center of the convex lens, and then reaches the power meter. The distances between the center of the convex lens and the center of the rotating table and between the center of the convex lens and the power meter are both 2f. This detection device can ensure that when the thin-film polarizer is rotated near the Brewster angle, the reflected light will always stably enter the center of the power meter probe, avoiding the test error caused by the repeated movement of the power meter position during the test, and thus ensuring accurate measurement.

The invention discloses a method for manufacturing a head-up display reflecting film, which belongs to the field of vehicle display, and comprises the steps of preparing a reflecting layer, calculating parameters of a compensation layer, preparing the compensation layer, forming the head-up display reflecting film and the like, and the manufactured head-up display reflecting film reflects a light beam generated by a display device which is incident at a Brewster angle in a vehicle. The energy of the light beam forming the ghosting is reduced, and the ghosting is eliminated; only right-handed circularly polarized light close to the working wavelength of the display device is reflected for natural light outside a vehicle, and natural light with other wavelengths and polarization directions is transmitted, so that the head-up display reflecting film has high reflectivity and high transmittance.

The invention provides a device and a method for narrowing the line width of a frequency-doubled laser. The device comprises a pumping module and a laser resonant cavity, the pumping module is used for providing linearly polarized light in a specific polarization direction to a light path; the laser resonant cavity is internally provided with a gain medium, at least one birefringence optical filter and a frequency doubling crystal which are sequentially arranged along an optical path, and the at least one birefringence optical filter is inserted into the optical path at a Brewster angle; wherein the linearly polarized light is focused in the gain medium, the central wavelength of the linearly polarized light is the same as the absorption peak wavelength of the gain medium, and the polarization direction of the linearly polarized light is the same as the maximum absorption direction of the gain medium. According to the invention, through specific adjustment of the birefringence optical filter (group) inserted into the laser resonant cavity, narrow-band filtering can be conveniently and rapidly realized in various intracavity frequency doubling lasers, and compared with the prior art, the power loss introduced by the application is relatively small.

The invention provides a laser chip with a polarization selection characteristic, a polarization type heat dissipation window sheet is bonded outside a physicochemical protection layer of the laser chip, and an included angle between a bonding edge and a Brewster edge is set to ensure that an incident angle is equal to a Brewster angle when laser in a resonant cavity is incident on the Brewster edge, so that the polarization selection characteristic of the laser chip is improved. Therefore, all the s polarization states in the laser beam are reflected and escape out of the resonant cavity, only the p polarization state of the laser forming the resonance is left, and the output laser is ensured to be linearly polarized p polarized light. And secondly, under the condition that other special polarization elements do not need to be additionally inserted into the resonant cavity, linear polarization laser output can be obtained, so that other elements for selecting polarization of the laser can be omitted, and the intra-cavity loss of the laser is reduced.

The invention discloses a passive Q-switched pulse laser and a pulse generation method thereof. The laser comprises an optical pumping device, a laser gain medium and a laser resonant cavity. The laser is characterized in that a saturated absorber crystal with an uncoated light passing surface is arranged in the resonant cavity, and the crystal is arranged in a laser light path in the resonant cavity at a Brewster angle. Through the configuration, the saturable absorber crystal serves as an intra-cavity polarization selection element while realizing a passive Q-switching function, so that the structure is simplified, and linear polarization output is realized.

The present invention discloses a KDP frequency doubling crystal structure, which includes a crystal fixing structure, a KDP crystal, a π polarization tube, and a σ polarization tube; the π polarized light with a central wavelength of 800 nm passes through the π polarization tube, enters the KDP crystal, and the KDP crystal doubles the π polarized light with a central wavelength of 800 nm into σ polarized light with a central wavelength of 400 nm, and finally outputs from the σ polarization tube. The inclined surfaces of the closed ends of the π polarization tube and the σ polarization tube are both designed with Brewster angles. The KDP crystal is placed in a vacuum closed cavity formed by the π polarization tube, the σ polarization tube, and the crystal fixing structure, eliminating the cumbersome process of crystal coating, avoiding the deliquescence of the KDP crystal in the air, and overcoming the problems that the coating layer of the existing KDP crystal is easily damaged by high-intensity fundamental frequency light, resulting in a short service life of the crystal, an increase in coating difficulty, and an improvement in coating technical requirements. The structure of the present invention is simple, can be obtained through simple mechanical processing, and has a low manufacturing cost.

The invention discloses a maneuvering method and device for avoiding lightweight calculation based on flare interference, and belongs to the field of load maneuvering planning. The method comprises the following steps: establishing a first spherical triangle taking a satellite centroid as a sphere center under a satellite body coordinate system based on a sun vector, an observation direction of a satellite and a vector of a target point pointing to the earth surface by the earth center; in a plane formed by the sun vector and the earth core pointing earth surface target point vector, by taking the earth core pointing earth surface target point vector as a bisector, constructing a light reflection vector symmetrical to the sun vector so as to establish a second spherical triangle under the satellite body coordinate system; based on the first spherical triangle, the second spherical triangle and the Brewster angle of water, judging whether the satellite photographing is in a flare interference area or not; and based on the judgment result, calculating a yaw offset angle which is superposed to the original yaw angle so as to avoid flare interference. According to the scheme, the calculation process can be greatly simplified, and the calculation amount and memory occupation are less than 1 / 10 of those of an original method.

The invention discloses an automotive reflecting film for eliminating ghosting and a display structure, and belongs to the field of automotive display, the automotive reflecting film comprises a first liquid crystal layer and a second liquid crystal layer, the directors of the first liquid crystal layer are in the same direction, the thickness of the first liquid crystal layer is 1 / 4 of a wave plate, the second liquid crystal layer is a reflecting layer, and the directors of the second liquid crystal layer are in the same direction. A director of the second liquid crystal layer is of a spiral structure in the longitudinal direction, the first liquid crystal layer is attached to a windshield, and the reflecting film reflects light beams generated by a display device incident at the Brewster angle in a vehicle, so that the energy of the light beams forming double images is reduced, and the double images are eliminated. Only P polarized light close to the working wavelength of the display device is reflected for natural light outside a vehicle, and natural light with other wavelengths and polarization directions is transmitted, so that the reflective film for the vehicle has high reflectivity and high transmittance.

The application discloses a head-up display reflection film manufacturing method, and belongs to the field of vehicle display. The head-up display reflection film is manufactured through the steps of preparing a reflection layer, calculating compensation layer parameters, preparing a compensation layer, and forming a head-up display reflection film, etc. The head-up display reflection film reflects the light beam generated by the display device which is incident at Brewster's angle in the vehicle, so that the light beam energy forming ghost image is small, and the ghost image is eliminated. The head-up display reflection film only reflects right-handed circularly polarized light with a wavelength close to the working wavelength of the display device for the outside natural light, and transmits the natural light with other wavelengths and polarization directions, so that the head-up display reflection film has high reflectivity and high transmittance.

The invention discloses a ghosting-free waveguide type head-up display system and a ghosting-free imaging method, and belongs to the technical field of vehicle-mounted display. The system comprises an image generation module, a collimation optical system, a waveguide assembly and a vehicle windshield. The HUD light emitted by the waveguide assembly only contains the P polarization component and is emitted to the glass surface at the incidence angle close to the Brewster angle of the windshield, and the characteristic that the reflectivity of the first surface approaches zero when the P polarization light is emitted at the Brewster angle is utilized, so that an HUD image is only reflected by the second surface to form a single virtual image; therefore, the ghosting problem caused by double reflection of the front surface and the rear surface in the traditional HUD is thoroughly eliminated. According to the system, a wedge-shaped windshield is not needed, the manufacturing complexity and cost are reduced, meanwhile, the waveguide technology is combined to achieve compact structure and large-view-field display, and the imaging definition and the driving safety are remarkably improved.