Complex amplitude light field regulation and control device and use method thereof

Abstract

The invention discloses a complex amplitude light field regulation and control device and a use method thereof, and relates to the technical field of spatial light modulation.The complex amplitude light field regulation and control device comprises a first transmission-type modulation device which is provided with a sandwich multilayer structure composed of an upper glass substrate, a liquid crystal layer and a pixel electrode, and the upper surface and the lower surface of the first transmission-type modulation device are provided with an upper surface polaroid and a lower surface polaroid respectively; the polarization direction of the upper surface polaroid is consistent with the polarization direction of incident light, and the polarization direction of the lower surface polaroid is perpendicular to the polarization direction of the incident light. According to the invention, through effective combination of a transmission-type modulation device and a reflection-type modulation device, the liquid crystal spatial light modulator is used for fine regulation and control of light beams, and multi-degree-of-freedom and high-precision modulation of amplitude, phase, polarization and the like is carried out on an incident light field, so that the light field regulation and control mode is greatly improved, and the hologram calculation iteration time is reduced; the method can be applied to multiple fields of holographic display, all-optical communication, laser processing and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of spatial light modulation, and in particular to a complex amplitude light field control device and a use method thereof. Background Art

[0002] Light field control technology can use spatial light modulators to generate new light field distributions with non-uniform distribution of amplitude, phase, and polarization in space, and has broad application prospects in many fields, such as holographic display, all-optical communication, beam shaping, etc. Spatial light modulators need to have real-time dynamic control and digital encoding capabilities, so they all perform corresponding wavefront modulation on light waves at different positions in a pixelated manner.

[0003] At present, the mainstream spatial light field control mainly uses two types of spatial light modulators, namely digital micromirrors (DMD) that can achieve amplitude modulation and liquid crystal on silicon (LCoS) that can achieve phase modulation. DMD devices are based on MEMS technology and have an array of multiple micro-mirrors. Each micromirror can be deflected by loading voltage, and the amplitude can be controlled by the speed of deflection. It has the advantages of fast modulation speed, high reflectivity and high damage threshold. LCoS devices achieve phase modulation by deflecting liquid crystal molecules and have high diffraction efficiency. They can be used in wavelength selection switches in optical communication backbone networks, or in invisible cutting and spot shaping in laser processing. However, these spatial light modulation devices can only achieve single phase or amplitude modulation, which restricts the control of complex modes of light fields. The realization of complex amplitude modulation of amplitude and phase at the same time is of great significance to multiple directions such as holographic display.

[0004] In order to achieve simultaneous amplitude and phase control in a spatial light modulator, the prior art usually uses a specific encoding algorithm to include the amplitude and phase information of the target light field distribution in a computational hologram. By combining multiple pixels, phase modulation can be achieved in an amplitude-type device or amplitude modulation can be achieved in a phase-type device. However, this method not only sacrifices resolution, but also involves complex holographic algorithm processing, which is inefficient. Other solutions are to cascade multiple spatial light modulators, and the entire optical module is large in size, which limits its application to more types of complex light fields.

[0005] In order to solve the problems of low efficiency, complex optical path, poor adaptability and so on in the existing complex amplitude light field modulation technology, the present invention provides a design scheme of a light field modulation device based on the combination of liquid crystal and beam splitter, which can realize independent regulation of the amplitude, phase and polarization of the incident light. Summary of the invention

[0006] The object of the present invention is to provide a complex amplitude light field control device and a method of using the same to solve the problems raised in the above background technology.

[0007] In order to solve the above technical problems, the present invention provides a complex amplitude light field control device, comprising:

[0008] A first transmission type modulation device, which has a sandwich multilayer structure consisting of a glass upper substrate, a liquid crystal layer and a pixel electrode, and is provided with an upper surface polarizer and a lower surface polarizer on its upper and lower surfaces respectively, the polarization direction of the upper surface polarizer is consistent with the polarization direction of the incident light, and the polarization direction of the lower surface polarizer is perpendicular to the polarization direction of the incident light;

[0009] Reflective modulation device, using liquid crystal on silicon LCOS structure;

[0010] The first beam splitter, the second beam splitter, the third beam splitter and the fourth beam splitter are all polarization-independent beam splitting devices, and the materials are transparent glass materials at the applied wavelength;

[0011] The first 1 / 4 wave plate, the second 1 / 4 wave plate, the third 1 / 4 wave plate and the fourth 1 / 4 wave plate are used to accurately modulate the polarization state of the incident light;

[0012] A first dielectric layer is disposed between the first beam splitter and the reflective modulation device;

[0013] The second dielectric layer is arranged between the second beam splitter and the reflective modulation device.

[0014] Furthermore, the first transmission modulation device is fixed on the upper surface of the first beam splitter.

[0015] Furthermore, the reflective modulation device is fixed below the third beam splitter and the fourth beam splitter.

[0016] Furthermore, the optical path difference between the first transmission modulation device and the reflection modulation device is in a near field range of <5 cm.

[0017] Furthermore, the complex amplitude light field control device is coated with an anti-reflection thin film coating on both the glass and air interfaces.

[0018] Furthermore, the thickness of the first dielectric layer is equal to the thickness of the first quarter wave plate.

[0019] Furthermore, the thickness of the second dielectric layer is equal to the sum of the thicknesses of the fourth quarter wave plate and the bottom polarizer. The bottom polarizer is arranged on the upper surface of the right half SLM of the reflective modulator. Its polarization direction is consistent with the optical axis direction of the liquid crystal molecules in the reflective modulator, so as to maintain the compact structure of the device.

[0020] A method for using a complex amplitude light field control device, comprising:

[0021] First design:

[0022] The incident light is guided to be incident on the first transmission modulator after being expanded and collimated, and the arrangement of the liquid crystal molecules is controlled by changing the voltage applied to the liquid crystal layer of the first transmission modulator, so as to realize amplitude modulation of the incident light by using the orthogonal polarizers on the upper and lower surfaces to generate a transmission light field;

[0023] The transmitted light field is made to irradiate the left half SLM of the reflective modulation device after passing through the first beam splitter, and the phase of the incident light is modulated to generate a reflected light field, and the polarization direction of the transmitted light field is kept parallel to the optical axis direction of the liquid crystal molecules in the reflective modulation device;

[0024] The reflected light field is made to pass through the first beam splitter and the second beam splitter in sequence to reach the right half SLM of the reflective modulation device, and the light field is polarized and modulated by the first 1 / 4 wave plate arranged on the surface thereof to generate the final reflected light field, and the fast axis direction of the first 1 / 4 wave plate forms a specific angle with the optical axis direction of the liquid crystal molecules in the reflective modulation device;

[0025] The reflected light field is transmitted through the second beam splitter to achieve separate control of amplitude, phase and polarization. The first transmission modulator and the reflective modulator share a common drive control. According to specific application requirements, a hologram is generated using a holographic algorithm and loaded onto the first transmission modulator and the reflective modulator. According to the target light field phase distribution, the phase of the left half of the reflective modulator is used to compensate for the additional phase caused by amplitude and polarization modulation.

[0026] Second design:

[0027] In view of the fact that the pixel size of the first transmissive modulation device is several times that of the reflective modulation device, and the importance of polarization distribution is relatively low in some application scenarios, the reflective modulation device is used for amplitude and phase modulation of the light field, and the second transmissive modulation device is used for modulating the polarization of the light field;

[0028] The incident light is guided to be incident on the left half SLM of the reflective modulation device after being expanded and collimated through the second beam splitter for phase modulation and generating a reflected light field, and the polarization direction of the incident light is kept parallel to the optical axis direction of the liquid crystal molecules in the reflective modulation device;

[0029] The reflected light field is made to pass through the third beam splitter and the fourth beam splitter in sequence to reach the right half SLM of the reflective modulation device, and is amplitude modulated by the fourth 1 / 4 wave plate and the bottom polarizer arranged on the surface thereof to generate a reflected light field, and the fast axis direction of the fourth 1 / 4 wave plate forms a specific angle with the optical axis direction of the liquid crystal molecules in the reflective modulation device;

[0030] The reflected light field is transmitted through the fourth beam splitter to the second transmission modulator for polarization modulation and emission, which is achieved by arranging a second 1 / 4 wave plate and a third 1 / 4 wave plate on the upper and lower surfaces of the second transmission modulator. The fast axis directions of the fourth 1 / 4 wave plate are perpendicular to each other, and the optical axis direction of the liquid crystal molecules in the second transmission modulator forms a specific angle with the fast axis direction of the fourth 1 / 4 wave plate. The SLM phase modulation of the reflection modulator is used to compensate for the amplitude of the light field and the additional phase generated by the polarization modulation.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] Utilizing the fine modulation characteristics of the spatial light modulator on the light beam, combined with the compact structure and small size of the beam splitter, a light field complex amplitude control device that independently controls the amplitude, phase and polarization is proposed to meet various application needs and realize the miniaturization and standardization of processing modules. It is a highly efficient and widely applicable spatial light modulation technology.

[0033] Through the effective combination of transmissive and reflective modulation devices, the liquid crystal spatial light modulator is used to finely control the light beam, and the incident light field is modulated with multiple degrees of freedom and high precision, such as amplitude, phase, polarization, etc., which greatly improves the light field control method and reduces the hologram calculation iteration time. It can be used in many fields such as holographic display, all-optical communication, and laser processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of a complex amplitude light field control device and a method of using the same according to the present invention;

[0035] Figure 2 A schematic diagram of a first designed optical path in a complex amplitude light field control device and a method for using the same according to the present invention;

[0036] Figure 3 A schematic diagram of a second optical path design in a complex amplitude light field control device and a method for using the same according to the present invention;

[0037] Figure 4 This is a light field control diagram of a complex amplitude light field control device and a method of using the same according to the present invention.

[0038] In the figure:

[0039] 101, first transmission modulator; 1011, upper surface polarizer; 1012, lower surface polarizer; 102, first beam splitter; 103, LCOS modulator; 104, first dielectric layer; 105, second beam splitter; 106, first quarter wave plate; 201, reflective modulator; 202, second transmission modulator; 2021, second quarter wave plate; 2022, third quarter wave plate; 203, third beam splitter; 204, fourth beam splitter; 205, fourth quarter wave plate; 206, bottom polarizer; 207, second dielectric layer. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] See also Figure 1-Figure 4 , the present invention provides a technical solution:

[0042] See also Figure 1-Figure 4 As shown, an embodiment of a complex amplitude light field control device and a method of using the same:

[0043] A complex amplitude light field control device:

[0044] A first transmission modulator 101, a reflection modulator 201, a first beam splitter 102, a second beam splitter 105, a third beam splitter 203, a fourth beam splitter 204, a first quarter wave plate 106, a second quarter wave plate 2021, a third quarter wave plate 2022, a fourth quarter wave plate 205, an upper surface polarizer 1011, a lower surface polarizer 1012, a bottom polarizer 206, a first dielectric layer 104 and a second dielectric layer 207.

[0045] The first transmission modulator 101 is a sandwich multilayer structure of glass upper substrate-liquid crystal layer-pixel electrode, fixed on the upper surface of the first beam splitter 102, and its upper and lower surfaces are respectively provided with a pair of orthogonal polarizers, namely, an upper surface polarizer 1011 and a lower surface polarizer 1012. The direction of the upper surface polarizer 1011 is consistent with the polarization direction of the incident light, and the direction of the lower surface polarizer 1012 is perpendicular to it. By changing the voltage applied to the liquid crystal layer to control the arrangement of liquid crystal molecules, the intensity of the incident light is modulated, thereby achieving the purpose of amplitude modulation.

[0046] The first beam splitter 102 , the second beam splitter 105 , the third beam splitter 203 and the fourth beam splitter 204 are all polarization-independent beam splitting devices, and like the first 1 / 4 wave plate 106 , the second 1 / 4 wave plate 2021 , the third 1 / 4 wave plate 2022 and the fourth 1 / 4 wave plate 205 , their materials are all transparent glass materials at the applied wavelength.

[0047] The reflective modulation device 201 uses liquid crystal on silicon (LCOS) and is fixed below the third beam splitter 203 and the fourth beam splitter 204. It is divided into two parts SLM1 and SLM2 of the same size by the beam splitter and is mainly used to modulate the phase of the incident light.

[0048] The first 1 / 4 wave plate 106, the second 1 / 4 wave plate 2021, the third 1 / 4 wave plate 2022, and the fourth 1 / 4 wave plate 205 are used to precisely modulate the polarization state of the incident light. In addition, to facilitate hologram calculation and calibration, the optical path difference between the first transmission modulation device 101 and the reflection modulation device 201 is in the near field range (<5 cm), and the complex amplitude light field control device is coated with an anti-reflection film coating on the glass and air interfaces.

[0049] A first design of a method for using a complex amplitude light field control device:

[0050] After the incident light is expanded and collimated, it is incident on the first transmission modulator 101 for amplitude modulation and generates a transmission light field. A pair of orthogonal polarizers are placed on the upper and lower surfaces of the first transmission modulator 101. The direction of the upper surface polarizer 1011 is consistent with the polarization direction of the incident light, and the direction of the lower surface polarizer 1012 is perpendicular to the polarization direction of the incident light. The voltage applied to the liquid crystal layer is used to control the arrangement of the liquid crystal molecules, thereby changing the intensity modulation of the incident light by the transmission modulator. The Jones vector expression of the transmission light field is:

[0051]

[0052] Where A1(x,y) is the amplitude of the target light field after modulation, is the additional phase modulation produced by the liquid crystal layer and is related to A1(x,y).

[0053] After passing through the first beam splitter 102, the transmitted light field E1 is irradiated to the left half SLM1 of the LCOS modulator 103 for phase modulation and generates a reflected light field. In order to keep the device compact and stable, a first dielectric layer 104 is sandwiched between the first beam splitter 102 and the LCOS modulator 103, and its thickness is the same as that of the first 1 / 4 wave plate 106. The polarization direction of the transmitted light field is parallel to the optical axis direction of the liquid crystal molecules in the LCOS. The Jones vector expression of the reflected light field E2 is:

[0054]

[0055] In the formula It is the phase modulation generated by the left half SLM1 of the LCOS modulation device 103.

[0056] The reflected light field E2 passes through the first beam splitter 102 and the second beam splitter 105 in sequence and then reaches the right half SLM2 of the LCOS modulator 103 for polarization modulation and generates a reflected light field. The first 1 / 4 wave plate 106 is fixed on the upper surface of the right half SLM2 of the LCOS modulator 103, and the fast axis direction of the first 1 / 4 wave plate 106 forms an angle with the optical axis direction of the liquid crystal molecules in the LCOS modulator 103. The Jones vector expression of the finally obtained reflected light field E3 is:

[0057]

[0058] In the formula In addition to the phase modulation generated by the right half SLM2 of the LCOS modulation device 103, the polarization modulation of the light field will generate additional phase modulation.

[0059] The reflected light field is transmitted through the second beam splitter 105 to achieve separate control of amplitude, phase and polarization. The first transmission modulator 101 and the LCOS modulator 103 share a common drive control, and the deflection angle of the liquid crystal is controlled by a voltage signal. According to specific application requirements, a hologram is generated using a holographic algorithm and loaded onto the transmission and reflection modulators. According to the target light field phase distribution, the phase loaded into the left half of the LCOS modulator 103 can be used to compensate for the additional phase caused by the amplitude and polarization modulation.

[0060] A second design of a method for using a complex amplitude light field control device:

[0061] Since the pixel size of the first transmission modulator 101 is several times that of the LCOS modulator 103, the polarization distribution is less important than the amplitude and phase distribution of the target light field. Therefore, the reflective modulator 201 is used for amplitude and phase modulation of the light field, and the second transmission modulator 202 is used to modulate the polarization of the light field. After the incident light is expanded and collimated, it passes through the third beam splitter 203 and is incident on the left half SLM1 of the reflective modulator 201 for phase modulation and generates a reflected light field. The polarization direction of the incident light remains parallel to the optical axis direction of the liquid crystal molecules in the reflective modulator 201. The Jones vector expression of the reflected light field is:

[0062]

[0063] In the formula It is the phase modulation generated by the left half SLM1 of the reflective modulation device 201.

[0064] The reflected light field E′1 passes through the third beam splitter 203 and the fourth beam splitter 204 in sequence, and then reaches the right half SLM2 of the reflective modulator 201 for amplitude modulation to generate a reflected light field E'2. The fourth 1 / 4 wave plate 205 and the bottom polarizer 206 are fixed on the upper surface of the right half SLM2 of the reflective modulator 201. In order to keep the device compact and stable, a second dielectric layer is sandwiched between the third beam splitter 203 and the reflective modulator 201, and its thickness is the same as the sum of the thicknesses of the fourth 1 / 4 wave plate 205 and the bottom polarizer 206. The fast axis direction of the fourth 1 / 4 wave plate 205 is at an angle to the optical axis direction of the liquid crystal molecules in the LCOS, and the direction of the bottom polarizer 206 is consistent with the optical axis direction of the liquid crystal molecules in the LCOS. The Jones vector expression of the reflected light field E'2 is obtained as follows:

[0065]

[0066] In the formula It is the phase modulation generated by the right half SLM2 of the reflective modulation device 201.

[0067] The reflected light field E3 is transmitted to the second transmission modulator 202 through the fourth beam splitter 204 for polarization modulation and then emitted. The second 1 / 4 wave plate 2021 and the third 1 / 4 wave plate 2022 are fixed on the upper and lower surfaces of the second transmission modulator 202, respectively. The fast axis directions of the fourth 1 / 4 wave plate 205 are perpendicular to each other, and the optical axis direction of the liquid crystal molecules in the second transmission modulator 202 is at an angle to the fast axis direction of the fourth 1 / 4 wave plate 205.

[0068] The Jones vector expression of the transmitted light field is finally obtained as follows:

[0069]

[0070] In the formula In order to generate the phase modulation through the second transmissive modulation device 202 , the amplitude and polarization modulation of the light field will generate additional phase modulation and can be compensated by the phase modulation of SLM1 .

[0071] Summarize:

[0072] A complex-amplitude light field control architecture integrating multiple optical elements has been constructed, breaking through the technical bottleneck that traditional light field modulation devices can only achieve single amplitude or phase modulation, and successfully realizing independent, precise and dynamic control of light field amplitude, phase and polarization, providing a new solution for the generation and application of complex light fields, greatly expanding the dimension and flexibility of light field control, and meeting the stringent requirements for complex light fields in cutting-edge fields such as optical encryption and quantum communication.

[0073] A precise compensation mechanism for the additional phase generated by amplitude and polarization modulation has been developed. Through reasonable optical layout and precise algorithm control, the additional phase introduced by amplitude and polarization modulation can be offset in real time and accurately during the light field modulation process, effectively overcoming the light field distortion and error problems caused by the accumulation of additional phase in traditional light field control methods, significantly improving the accuracy and stability of light field control, ensuring the integrity and reliability of the light field during transmission and application, and providing solid technical support for high-precision light field applications such as high-resolution holographic display and precision optical measurement.

[0074] Through the optimization selection, fine layout and parameter matching of each optical element, the standardized and miniaturized design of the device was successfully achieved. Compared with the traditional cascade method of multiple spatial light modulators, the present invention greatly reduces the number and volume of optical elements, reduces the complexity and manufacturing cost of the system, and improves the stability and reliability of the device. The standardized design makes the device easier to integrate into various optical systems, and the miniaturization feature broadens its application range in space-constrained environments, such as micro optical communication terminals, portable optical detection equipment, etc., which has strongly promoted the popularization and application of light field control technology in more fields.

[0075] Amplitude modulation: through the unique combination of liquid crystal layer voltage regulation and orthogonal polarizers, as well as the ingenious design of combining specific wave plates and polarizers, ultra-fine control of the amplitude of the light field can be achieved. In the field of holographic display, this high-precision amplitude modulation capability can make the holographic image present a more delicate and realistic light and dark contrast effect, significantly improving the visual quality and viewing experience of the image; in the field of laser processing, the energy distribution of the light spot can be accurately customized to achieve efficient and accurate processing of the processing materials, effectively improve the processing accuracy and product quality, reduce the scrap rate, and thus greatly improve production efficiency and economic benefits.

[0076] Phase modulation: In the two design schemes, the phase of the light field is precisely controlled to the sub-wavelength level. In holographic display, this greatly improves the reproduction accuracy and clarity of the holographic image, and can present richer details and three-dimensional sense, as if the real object is presented in front of you; in the field of all-optical communication, precise phase control can effectively reduce the distortion and bit error rate of optical signals during transmission, significantly improve the transmission capacity and reliability of communication systems, meet the development needs of high-speed and large-capacity optical communications in the future, and promote optical communication technology to a higher level.

[0077] Polarization modulation: It achieves near-perfect control of the polarization state of the light field. In polarized light communications, this high-precision polarization modulation capability can greatly enhance the confidentiality and anti-interference of communications, ensuring the security and integrity of information during transmission; in the field of optical imaging, it can effectively improve the contrast and clarity of images, allowing tiny details and weak signals to be clearly presented, providing more accurate and reliable image information for medical diagnosis, material science research and other fields, and facilitating the precise development of scientific research and clinical work.

[0078] In terms of overall performance of the device: through the optimization design of the device structure, the device has been successfully standardized and miniaturized, overcoming the shortcomings of traditional light field control devices such as large size, complex structure, and difficult integration. This not only improves the practicality and stability of the device, allowing it to be more easily integrated into various complex light field control systems, but also greatly reduces the iteration time of hologram calculations, and improves the efficiency and response speed of light field control. In addition, the miniaturized and standardized design also reduces the manufacturing cost, power consumption, and maintenance difficulty of the equipment, with significant economic and social benefits, laying a solid foundation for the widespread application and popularization of light field control technology in more fields, and is expected to promote the upgrading and development of related industries and create more market value and application prospects.

Claims

1. A complex amplitude light field control device, characterized in that: include: A first transmission type modulation device (101) having a sandwich multilayer structure consisting of a glass upper substrate, a liquid crystal layer and pixel electrodes, and having an upper surface polarizer (1011) and a lower surface polarizer (1012) respectively arranged on its upper and lower surfaces, wherein the polarization direction of the upper surface polarizer (1011) is consistent with the polarization direction of the incident light, and the polarization direction of the lower surface polarizer (1012) is perpendicular to the polarization direction of the incident light; A reflective modulation device (201) adopts a silicon-based liquid crystal structure; The first beam splitter (102), the second beam splitter (105), the third beam splitter (203) and the fourth beam splitter (204) are all polarization-independent beam splitting devices, and are made of transparent glass materials at an applied wavelength; A first quarter wave plate (106), a second quarter wave plate (2021), a third quarter wave plate (2022) and a fourth quarter wave plate (205), used for accurately modulating the polarization state of incident light; A first dielectric layer (104) is arranged between the first beam splitter (102) and the reflective modulation device (201); The second dielectric layer (207) is arranged between the third beam splitter (203) and the reflective modulation device (201).

2. A complex amplitude light field control device as claimed in claim 1, characterized in that: The first transmission type modulation device (101) is fixed on the upper surface of the first beam splitter (102).

3. The complex amplitude light field control device according to claim 1, characterized in that: The reflective modulation device (201) is fixed below the third beam splitter (203) and the fourth beam splitter (204).

4. The complex amplitude light field control device according to claim 1, characterized in that: The optical path difference between the first transmission-type modulation device (101) and the reflection-type modulation device (201) is within a near-field range of less than 5 cm.

5. The complex amplitude light field control device according to claim 1, characterized in that: The complex amplitude light field control device is plated with anti-reflection thin film coatings on both glass and air interfaces.

6. The complex amplitude light field control device according to claim 1, characterized in that: The thickness of the first dielectric layer (104) is equal to the thickness of the first quarter wave plate (106).

7. The complex amplitude light field control device according to claim 1, characterized in that: The thickness of the second dielectric layer (207) is equal to the sum of the thicknesses of the fourth quarter wave plate (205) and the bottom polarizer (206). The bottom polarizer (206) is arranged on the upper surface of the right half SLM2 of the reflective modulation device (201). Its polarization direction is consistent with the optical axis direction of the liquid crystal molecules in the reflective modulation device (201), and is used to maintain the compact structure of the device.

8. A method for using a complex amplitude light field control device, characterized in that: include: First design: The incident light is guided to be incident on the first transmission modulator (101) after being expanded and collimated, and the arrangement of the liquid crystal molecules is regulated by changing the voltage applied to the liquid crystal layer of the first transmission modulator (101), thereby realizing amplitude modulation of the incident light by using the orthogonal polarizers on the upper and lower surfaces to generate a transmission light field; The transmitted light field passes through a first beam splitter (102) and is then irradiated onto a left half SLM1 of a reflective modulation device (201), whereby the phase of the incident light is modulated and a reflected light field is generated, wherein the polarization direction of the transmitted light field is kept parallel to the optical axis direction of the liquid crystal molecules in the reflective modulation device (201); The reflected light field is sequentially passed through a first beam splitter (102) and a second beam splitter (105) to reach the right half SLM2 of the reflective modulation device (201), and the light field is polarized and modulated by a first quarter wave plate (106) arranged on the surface thereof to generate a final reflected light field, wherein the fast axis direction of the first quarter wave plate (106) forms a specific angle with the optical axis direction of the liquid crystal molecules in the reflective modulation device (201); The reflected light field is transmitted through the second beam splitter (105) to achieve separate control of amplitude, phase and polarization; the first transmission modulator (101) and the reflective modulator (201) share a common drive control; according to specific application requirements, a hologram is generated using a holographic algorithm and loaded onto the first transmission modulator and the reflective modulator; according to the target light field phase distribution, the phase of the left half of the reflective modulator (201) is used to compensate for the additional phase caused by amplitude and polarization modulation; Second design: Considering that the pixel size of the first transmission modulator (101) is several times that of the pixel size of the reflection modulator (201), and the importance of polarization distribution is relatively low in certain application scenarios, the reflection modulator (201) is used for amplitude and phase modulation of the light field, and the second transmission modulator (202) is used for modulating the polarization of the light field; The incident light is guided to be incident on the left half SLM1 of the reflective modulation device (201) after being expanded and collimated, and then passes through a third beam splitter (203) to be phase modulated and generate a reflected light field, wherein the polarization direction of the incident light is kept parallel to the optical axis direction of the liquid crystal molecules in the reflective modulation device (201); The reflected light field is sequentially passed through a third beam splitter (203) and a fourth beam splitter (204) to reach the right half SLM2 of the reflective modulation device (201), and amplitude modulation is performed through a fourth quarter wave plate (205) and a bottom polarizing plate (206) arranged on the surface thereof to generate a reflected light field, wherein the fast axis direction of the fourth quarter wave plate (205) forms a specific angle with the optical axis direction of the liquid crystal molecules in the reflective modulation device (201); The reflected light field is transmitted through the fourth beam splitter (204) to the second transmission modulator (202) for polarization modulation and emission, which is achieved by arranging a second quarter wave plate (2021) and a third quarter wave plate (2022) on the upper and lower surfaces of the second transmission modulator (202), the fast axis directions of the fourth quarter wave plate (205) are perpendicular to each other, the optical axis direction of the liquid crystal molecules in the second transmission modulator (202) and the fast axis direction of the fourth quarter wave plate (205) form a specific angle, and the SLM1 phase modulation of the reflection modulator (201) is used to compensate for the amplitude of the light field and the additional phase generated by polarization modulation.

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