CN112071174A - Optical teaching system based on transmission-type spatial light modulator - Google Patents
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Abstract
The invention provides an optical teaching system based on a transmission-type spatial light modulator, which comprises a laser, a beam expander and the transmission-type spatial light modulator, wherein a simulation graph is loaded on the transmission-type spatial light modulator, a laser beam emitted by the laser is expanded by the beam expander to form a collimated beam, the collimated beam enters the transmission-type spatial light modulator and can irradiate the whole target surface of the spatial light modulator, the transmission-type spatial light modulator modulates the incident collimated beam to control an output light field, different optical elements can be added in front of or behind the transmission-type spatial light modulator according to different realized function requirements, the simulation graph loaded on the transmission-type spatial light modulator is changed according to the function requirements, and the light beam is correspondingly modulated by the transmission-type spatial light modulator, to meet different experimental requirements.
Description
Technical Field
The invention relates to the technical field of optical teaching or photoelectric teaching research and demonstration, in particular to an optical teaching system based on a transmission-type spatial light modulator.
Background
Modern optical equipment is generally more expensive, and the integration level is too high, can not help the student to the understanding of optics principle, and the experiment of accomplishing is also more single, and the school can only satisfy the demand of different experiments through purchasing different equipment, and this has also increased the purchasing pressure of school.
A Spatial Light Modulator (SLM) is a device that can modulate the spatial distribution of light waves. Spatial light modulators comprise a plurality of individual cells spatially arranged in a one-or two-dimensional array, each cell being capable of independently receiving an electrical or optical signal and, in response to the signal, changing its optical properties to change the amplitude or intensity, phase, polarization, and wavelength of the spatially distributed light or to convert incoherent light into coherent light. The spatial light modulator is generally divided into a transmissive type and a reflective type according to a reading mode of a reading light; and may be divided into optical addressing (OA-SLM) and electrical addressing (EA-SLM) according to the manner of inputting the control signal. Spatial light modulators have gained increasing importance and value in the modern optical field, and are essential components and key devices in optical and optoelectronic hybrid systems for optical interconnection, optical correlation, optical computing, pattern recognition, optical control, optical detection, image processing, display technology, etc.
The experimental facilities used in the present photoelectric laboratory are old and many of them are not replaced for many years, with the progress of science and technology, the modern and digital facilities are shown like bamboo shoots in spring after rain, and the single-pixel flexible programmable characteristic of the spatial light modulator makes the application of the spatial light modulator very wide, but the situation of applying the spatial light modulator in the teaching field is not many. The optical teaching system built by the transmission type spatial light modulator has the inherent advantages that: the transmission type light path is easy to build and adjust. The transmission type spatial light modulator is introduced into a college photoelectric laboratory, and an optical teaching classroom, a middle school science and technology development laboratory and a school exhibition hall are very necessary. This also helped to cultivate high-quality talents that fit the needs of the new century.
Disclosure of Invention
In view of the foregoing, there is a need to provide an optical teaching system based on a transmissive spatial light modulator, which has a simple and easily adjustable optical path and high integration level, in order to overcome the drawbacks of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
an optical teaching system based on a transmissive spatial light modulator, comprising: the device comprises a laser, a beam expander and a transmission type spatial light modulator, wherein the transmission type spatial light modulator is loaded with simulation graphs, and the simulation graphs comprise:
laser beams emitted by the laser are expanded by the beam expander to form collimated beams, the collimated beams enter the transmissive spatial light modulator, the collimated beams entering the transmissive spatial light modulator can irradiate the whole target surface of the spatial light modulator, and the transmissive spatial light modulator modulates the incident collimated beams to control an output light field.
In some embodiments, when the simulation graph is a double-slit pattern, the optical teaching system further includes a focusing mirror and an image acquisition unit disposed on a back focal plane of the focusing mirror, the transmissive spatial light modulator modulates an incident collimated light beam to change a double-slit distance and a slit width of the double-slit pattern in real time, and translates and rotates double slits of the double-slit pattern, and the image acquisition unit detects a change of interference fringes in real time.
In some embodiments, when the simulation graph is a periodic grid grating, the optical teaching system further comprises an image acquisition unit, the transmissive spatial light modulator modulates the incident collimated light beam to change the slit width and the period of the periodic grid grating in real time, and the image acquisition unit acquires a Talbot image of the grating in real time.
In some embodiments, when the simulation pattern is a small hole, an annular hole, or a slit, the optical teaching system further includes a grid grating, a first focusing lens, a second focusing lens, and an image acquisition unit, the spatial light modulator is located at a back focal plane of the first focusing lens, a laser beam emitted from the laser is expanded by the beam expander to form a collimated beam, the collimated beam sequentially passes through the grid grating and the first focusing lens and then enters the transmissive spatial light modulator, and the transmissive spatial light modulator modulates the incident collimated beam to filter a frequency spectrum of the grid grating, and the collimated beam passes through the second focusing lens and is acquired by the image acquisition unit to obtain an image of the grid grating after being filtered.
In some embodiments, when the simulated graphics are letters or characters, the optical teaching unit further includes a third focusing mirror, a small hole disposed on a rear focal plane of the third focusing mirror, a fourth focusing mirror, and an image collecting unit located on a focal plane of the fourth focusing mirror, and the transmissive spatial light modulator modulates an incident collimated light beam to generate different object light fields and is collected by the image collecting unit.
In some embodiments, when the simulation graph is a kinoform, the optical teaching system further includes a focusing mirror and an image collecting unit disposed on a back focal plane of the focusing mirror, the transmissive spatial light modulator modulates an incident collimated light beam to change phase information of the incident light, and the image collecting unit collects a result of holographic reconstruction.
In some of these embodiments, the image capture unit is a high resolution CCD or a power meter or a viewing screen.
The invention adopts the technical scheme that the method has the advantages that:
the invention provides an optical teaching system based on a transmission-type spatial light modulator, which comprises a laser, a beam expander and the transmission-type spatial light modulator, wherein a simulation graph is loaded on the transmission-type spatial light modulator, a laser beam emitted by the laser is expanded by the beam expander to form a collimated beam, the collimated beam enters the transmission-type spatial light modulator and can irradiate the whole target surface of the spatial light modulator, the transmission-type spatial light modulator modulates the incident collimated beam to control an output light field, different optical elements can be added in front of or behind the transmission-type spatial light modulator according to different realized function requirements, the simulation graph loaded on the transmission-type spatial light modulator is changed according to the function requirements, and the light beam is correspondingly modulated by the transmission-type spatial light modulator, to meet different experimental requirements.
The optical teaching system based on the transmission-type spatial light modulator is simple in light path structure, easy to build, capable of completing a plurality of traditional optical experiments, capable of replacing a core optical element according to requirements, more modernized and convenient than the traditional optical teaching system, high in integration level, wide in application range, capable of being used for laboratory development experiments, and suitable for classroom teaching demonstration through a design structure, and solves the problems that experiment phenomena are not obvious, observation is not easy, and cost for replacing optical elements is high and complex.
In addition, the experiment performed by the optical teaching system involves courses including: the optical courses of physics optics, information optics, college physics, high-grade optics and the like are also suitable for teachers to design experiments according to optical teaching contents.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an optical teaching system based on a transmissive spatial light modulator according to embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of an optical teaching system based on a transmissive spatial light modulator according to embodiment 2 of the present invention.
Fig. 3 is a schematic structural diagram of an optical teaching system based on a transmissive spatial light modulator according to embodiment 3 of the present invention.
Fig. 4 is a schematic structural diagram of an optical teaching system based on a transmissive spatial light modulator according to embodiment 4 of the present invention.
Fig. 5 is a schematic structural diagram of an optical teaching system based on a transmissive spatial light modulator according to embodiment 5 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides an optical teaching system based on a transmission type spatial light modulator, which comprises: the device comprises a laser, a beam expander and a transmission type spatial light modulator, wherein simulation graphs are loaded on the transmission type spatial light modulator.
Specifically, a laser is used to generate laser light required by the system, preferably a 532nm, 80mW solid-state laser.
Specifically, the beam expander is used to expand the light from the laser so that the incident laser light can illuminate the entire spatial light modulator target surface.
Further, the transmissive spatial light modulator is driven by electrically addressing a polysilicon Thin Film Transistor (TFT), which is also called a TFT-LCD spatial light modulator. The spatial light modulator consists of a plurality of liquid crystal cells spatially distributed in one or two dimensions, each cell being independently controlled by an electrical signal. The liquid crystal and the opaque electrodes (row and column electrodes) that control the electrical signals in the spatial light modulator constitute a structure that resembles an orthogonal grating. The liquid crystal screen of the transmission type spatial light modulator is made of an upper conductive glass sheet and a lower conductive glass sheet, the thickness of the liquid crystal screen is only a few micrometers, and forward liquid crystal is filled in the liquid crystal screen. The liquid crystal box has two glass substrates with linear polarizers adhered to the outer sides and conducting film and orientation layer coated to the inner sides, and the orientation layer is coated on the conducting film and rubbed to form fine grooves in the same direction on the surface to orient the liquid crystal. Because the linear polarizers are adhered to the outer sides of the two glass substrates of the liquid crystal box, the polarization direction of the polarizer is consistent with or vertical to the friction direction on the substrate, and the polarization directions of the analyzer and the polarizer are parallel or vertical to each other, the simple twisted nematic liquid crystal display screen is formed.
Further, the spatial light modulator provided by the invention adopts twisted nematic liquid crystal with a twist angle of about 90 degrees as an operating medium, and has the function of adjusting the phase and amplitude of light by a single pixel.
Furthermore, the simulation graph comprises a slit, a grating, a Fresnel zone plate, a hologram and the like, and different output light fields can be simulated, so that the optical simulation of Young double slit interference, Fraunhofer diffraction, a 4f spatial frequency filtering system, a convolution theorem and the like can be realized.
It can be understood that the optical teaching system structure measurement based on the transmissive spatial light modulator provided by the present invention can load different simulation images according to different requirements based on the above structure, and can realize the following functions including but not limited to: the method comprises the following steps of structural measurement, amplitude modulation, polarization state modulation, real-time image transformation, Talbot images, pixel size measurement, a spatial filter, a spatial filtering experiment, imaging and projection, Young double-slit interference, Fraunhofer diffraction, Fresnel diffraction, optical transformation properties of a lens, single-lens imaging with an aperture diaphragm, Abbe secondary imaging, an Abbe-Baud experiment, a 4f spatial frequency filtering system, optical simulation of convolution theorem, double-slit interference method study on phase modulation characteristics of SLM, digital holographic reconstruction, Fresnel lens, hollow light beams, light beam transformation (plane waves, spherical waves and cylindrical waves), dispersion, optical rotation and electro-optical effect of crystals.
The optical teaching system based on the transmission-type spatial light modulator works as follows:
laser beams emitted by the laser are expanded by the beam expander to form collimated beams, the collimated beams enter the transmissive spatial light modulator, the collimated beams entering the transmissive spatial light modulator can irradiate the whole target surface of the spatial light modulator, and the transmissive spatial light modulator modulates the incident collimated beams to control an output light field.
It can be understood that the optical teaching system provided by the invention can add different optical elements in front of or behind the transmission-type spatial light modulator according to different functional requirements, change the simulation graph loaded on the transmission-type spatial light modulator according to the functional requirements, and correspondingly modulate the light beam through the transmission-type spatial light modulator so as to meet different experimental requirements.
The above technical solution is described in detail below with reference to specific examples.
Example 1 Young's double slit interference
Referring to fig. 1, a schematic structural diagram of an optical teaching system based on a transmissive spatial light modulator according to an embodiment of the present invention includes: the system comprises a laser 110, a beam expander 120, a transmissive spatial light modulator 130, a focusing mirror 140 and an image acquisition unit 150 arranged on the back focal plane of the focusing mirror 140.
In particular, the focusing mirror 140 is used to fourier transform the light field, f 80 mm.
Further, the image capturing unit 150 is a high resolution CCD or a power meter or a viewing screen for capturing and analyzing the final result.
In this embodiment, the simulation graph is a double-slit pattern, and the optical teaching system operates as follows:
the transmissive spatial light modulator 130 modulates the incident collimated light beam to change the double-slit distance and the slit width of the double-slit pattern in real time, and translates and rotates the double slits of the double-slit pattern, and the image acquisition unit 150 detects the change of the interference fringes in real time.
It can be understood that, in the optical teaching system based on the transmissive spatial light modulator provided in this embodiment 1, the transmissive spatial light modulator 130 is loaded with the double-slit pattern, thereby achieving double-slit interference, by changing the distance between the double slits, the slit width, the double slits perform translation and rotation, the influence of the changes of the parameters such as the visual observation distance, the slit width, etc. on the interference pattern helps to understand the principle of young double-slit interference, and further, the young double-slit interference is utilized to complete the measurement of the wavelength, the measurement of the thickness and the refractive index of the thin film, and the measurement of the variable with the small length is more flexible than the traditional method for achieving double-slit interference, and the structure is simpler without changing different double slits and other optical elements.
Example 2 Talbot images
Referring to fig. 2, a schematic structural diagram of an optical teaching system based on a transmissive spatial light modulator according to an embodiment of the present invention includes: a laser 210, a beam expander 220, a transmissive spatial light modulator 230, and an image acquisition unit 240.
Specifically, the image capturing unit 240 is a high resolution CCD or a power meter or a viewing screen for capturing and analyzing the final result.
In this embodiment, when the simulation graph is a periodic grid grating, the optical teaching system works as follows:
the transmissive spatial light modulator 230 modulates the incident collimated light beam to change the slit width and the period of the periodic grid grating in real time, and the image acquisition unit 240 acquires the Talbot image of the grating in real time.
It can be understood that when the transmissive spatial light modulator 230 loads the periodic grid grating, the slit width and the period of the grating may be changed arbitrarily, and with the change of the position of the image collecting unit 240, a clear Talbot image of the grating, a Talbot image with an exactly opposite contrast, and a Talbot sub-image with a half period and a reduced contrast may be collected, respectively, and then grating measurement, human eye wavefront aberration measurement, optical nondestructive detection, and the like may be performed by using Talbot.
Example 3 Abbe-Baud experiment
Referring to fig. 3, a schematic structural diagram of an optical teaching system based on a transmissive spatial light modulator according to an embodiment of the present invention includes a laser 310, a beam expander 320, a transmissive spatial light modulator 330, a grid grating 340, a first focusing mirror 350, a second focusing mirror 360, and an image collecting unit 370, where the spatial light modulator 330 is located at a back focal plane of the first focusing mirror 350.
Specifically, the first focusing mirror 350 and the second focusing mirror 360 are used to perform fourier transform on the light field, where f is 80 mm.
Specifically, the line width of the grid grating 340 is 100/mm, and the output light field is subjected to two-dimensional grating diffraction after passing through the grid grating 340.
Further, the image capturing unit 370 is a high resolution CCD or a power meter or a viewing screen for capturing and analyzing the final result.
In this embodiment, when the simulation graph is a small hole or an annular hole or a slit, the optical teaching system operates as follows:
the laser beam emitted from the laser 310 is expanded by the beam expander 320 to form a collimated beam, which sequentially passes through the grid grating 340 and the first focusing lens 350 and then enters the transmissive spatial light modulator 330, and the transmissive spatial light modulator 330 modulates the incident collimated beam to filter the frequency spectrum of the grid grating 340, and the collimated beam passes through the second focusing lens 360 and is collected by the image collection unit 370 to obtain the filtered image of the grid grating 340.
It can be understood that the filtering process of the frequency spectrum of the grid grating 340 can be realized by loading the transmissive spatial light modulator 330 with small holes, circular holes, and slits, and the image of the grid grating after passing through different filters can be collected by the image collecting unit 370.
In this embodiment, the transmissive spatial light modulator 330 functions as a variable filter, and can implement a low-pass filter, a high-pass filter, a loop filter, a horizontal slit filter, and a vertical slit filter window, so as to eliminate scratches or meshes of an image by using spatial filtering, eliminate high-frequency noise, improve image contrast, and perform pseudo color coding.
Example 4 imaging and projection
Referring to fig. 4, a schematic structural diagram of an optical teaching system based on a transmissive spatial light modulator according to an embodiment of the present invention includes a laser 410, a beam expander 420, a transmissive spatial light modulator 430, a third focusing mirror 440, an aperture 450 disposed on a focal plane behind the third focusing mirror 440, a fourth focusing mirror 460, and an image acquisition unit 470 located on a focal plane of the fourth focusing mirror 460.
Specifically, the third focusing mirror 440 and the fourth focusing mirror 460 are used to perform fourier transform on the light field, where f is 80 mm.
Specifically, the aperture 450 has a diameter of 0.5mm and is used to aperture filter the spectral plane of the output light field.
Further, the image capturing unit 470 is a high resolution CCD or a power meter or a viewing screen for capturing and analyzing the final result.
In this embodiment, when the simulation graph is a letter or a character, the optical teaching system operates as follows:
the transmissive spatial light modulator 430 modulates the incident collimated light beam to generate a different object light field and is collected by the image collecting unit 470.
It can be understood that the third focusing mirror 440 is placed at a position 80mm behind the transmissive spatial light modulator 430, the aperture 450 is placed at the focal plane behind the third focusing mirror 440, so that only the 0-level light just passes through, the fourth focusing mirror 460 is placed 80mm behind the third focusing mirror 440, and the imaging plane of the image acquisition unit 470 is at the focal plane of the focusing mirror; by loading any image such as letters or characters to be imaged to the transmissive spatial light modulator 430, different object light fields are generated, and the contrast and definition of imaging can be greatly improved by the system, so that the system can be further applied to the imaging field or linear optical information processing.
Example 5 calculation of holograms
Referring to fig. 5, a schematic structural diagram of an optical teaching system based on a transmissive spatial light modulator according to an embodiment of the present invention includes a laser 510, a beam expander 520, a transmissive spatial light modulator 530, a focusing mirror 540, and an image collecting unit 550 disposed on a back focal plane of the focusing mirror 540.
In particular, the focusing mirror 540 is used to fourier transform the light field, f 80 mm.
Further, the image capturing unit 550 is a high resolution CCD or a power meter or a viewing screen for capturing and analyzing the final result.
In this embodiment, when the simulation graph is a kinoform, the optical teaching system operates as follows:
the transmissive spatial light modulator 530 modulates the incident collimated light beam to change the phase information of the incident light, and the image pickup unit 550 picks up the result of the holographic reconstruction.
The system does not need a holographic dry plate required by the traditional holography, the image to be reproduced can be a simulated image or an image shot by a camera, the holographic optical path does not have high requirements, and the traditional mode for realizing the holographic reproduction is changed, so that the holography is better, more convenient and faster to realize.
The above embodiments 1 to 5 provide the optical path schematic diagrams corresponding to the bionic patterns loaded by the transmissive spatial light modulator, which are double slit patterns, periodic grid gratings, small holes or annular holes or slits, letters or characters, and kinoforms, but are not limited to the above optical path structures in practice, different bionic patterns can be loaded according to requirements in practice, and core optical elements are more modernized and convenient to replace than the conventional optical teaching system, the integration level is high, the application is widely applicable to both laboratory development experiments and classroom teaching demonstration through the design structure, and the problems of unobvious experimental phenomena, difficulty in observation, high cost and complexity in replacing optical elements are solved.
In addition, the experiment performed by the optical teaching system involves courses including: the optical courses of physics optics, information optics, college physics, high-grade optics and the like are also suitable for teachers to design experiments according to optical teaching contents.
Of course, the optical teaching system based on the transmissive spatial light modulator of the present invention can have many variations and modifications, and is not limited to the specific structure of the above-mentioned embodiments. In conclusion, the scope of the present invention should include those changes or substitutions and modifications which are obvious to those of ordinary skill in the art.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. An optical teaching system based on a transmissive spatial light modulator, comprising: the device comprises a laser, a beam expander and a transmission type spatial light modulator, wherein the transmission type spatial light modulator is loaded with simulation graphs, and the simulation graphs comprise:
laser beams emitted by the laser are expanded by the beam expander to form collimated beams, the collimated beams enter the transmissive spatial light modulator, the collimated beams entering the transmissive spatial light modulator can irradiate the whole target surface of the spatial light modulator, and the transmissive spatial light modulator modulates the incident collimated beams to control an output light field.
2. The transmissive spatial light modulator-based optical teaching system of claim 1, wherein when the simulation pattern is a double-slit pattern, the optical teaching system further comprises a focusing mirror and an image capturing unit disposed on a back focal plane of the focusing mirror, the transmissive spatial light modulator modulates an incident collimated light beam to change a double-slit pitch and a slit width of the double-slit pattern in real time, and translates and rotates double slits of the double-slit pattern, the image capturing unit detects a change in interference fringes in real time.
3. The transmission-type spatial light modulator-based optical teaching system of claim 1 wherein when the simulation pattern is a periodic grid grating, the optical teaching system further comprises an image acquisition unit, the transmission-type spatial light modulator modulates an incident collimated light beam to change the slit width and the period of the periodic grid grating in real time, and the image acquisition unit acquires a Talbot image of the grating in real time.
4. The optical teaching system according to claim 1, wherein when the simulation pattern is a small hole, an annular hole, or a slit, the optical teaching system further includes a grid grating, a first focusing lens, a second focusing lens, and an image collecting unit, the spatial light modulator is located at a back focal plane of the first focusing lens, a laser beam emitted from the laser is expanded by the expanding lens to form a collimated beam, the collimated beam sequentially passes through the grid grating and the first focusing lens and enters the transmissive spatial light modulator, and the transmissive spatial light modulator modulates the incident collimated beam to filter a spectrum of the grid grating, and the collimated beam is collected by the image collecting unit after passing through the second focusing lens to obtain an image after the grid grating is filtered.
5. The optical teaching system based on the transmissive spatial light modulator of claim 1, wherein when the simulated graphics are letters or words, the optical teaching unit further comprises a third focusing lens, an aperture disposed at the back focal plane of the third focusing lens, a fourth focusing lens and an image collecting unit located at the focal plane of the fourth focusing lens, and the transmissive spatial light modulator modulates the incident collimated light beam to generate different object light fields and is collected by the image collecting unit.
6. The transmissive spatial light modulator-based optical teaching system of claim 1 wherein when the simulation pattern is an kinoform, the optical teaching system further comprises a focusing mirror and an image capturing unit disposed on a back focal plane of the focusing mirror, the transmissive spatial light modulator modulates an incident collimated light beam to change phase information of the incident light, and the image capturing unit captures a result of the holographic reconstruction.
7. The transmissive spatial light modulator-based optical teaching system of claim 2 or 3 or 4 or 5 or 6 wherein the image capture unit is a high resolution CCD or a power meter or a viewing screen.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112598982A (en) * | 2020-12-21 | 2021-04-02 | 浙江科技学院 | Wave optical teaching method and teaching device based on light field projection screen |
| CN114942560A (en) * | 2022-04-25 | 2022-08-26 | 西安中科微星光电科技有限公司 | Color projection system for simulating spatial light modulator |
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