A spatial light modulator and system
By building the configurable parameter items into the spatial light modulator, the problem of insufficient automation and applicability in the prior art is solved, and a wider adaptability and ease of use are achieved, and the beam modulation process is simplified.
Patent Information
- Application Number
- CN202111028392.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-09-02
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2041-09-02
AI Technical Summary
The existing spatial light modulators have shortcomings in automation control and applicability, and cannot interact with external devices in real time, and need to be recalculated when the optical path environment changes, resulting in system complexity and inconvenience in use.
The modulated data and configurable parameter items are separated and built into the spatial optical modulator, making them an optional parameter item of hardware. The user does not need to calculate separately, and it is easy to operate. The control unit generates addressed data and drives the optical head for modulation.
The control mode of the spatial light modulator has been greatly changed, making it more adaptable and easy to use, simplifying the control process, improving automated control capabilities, and adapting to different optical path environments.
Smart Images
Figure CN113867013B_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of spatial light modulation, and in particular relates to a spatial light modulator and a system. Background Art
[0002] A spatial light modulator is a light field control device. Users input addressing data to drive the optical head to achieve spatial modulation of the incident light beam, so that the outgoing light beam meets specific functional goals. Figure 1 As shown, the traditional spatial light modulator is programmed by the host computer to generate user addressing data F(x,y). The beam modulation function is determined by the input addressing data. The spatial light modulator is input through the interface to drive the optical head to modulate the incident light beam Input. The output light beam Output is the light beam result that the user wants to obtain. AP(x,y) is the spatial modulation function of the light beam. This part is used as the user target function function and is an uncertain user function. The content of this function is completely different in different application scenarios. In general, the incident light and the output light of the spatial light modulator are symmetrically emitted along the normal line of the optical surface. AP(x,y) is equivalent to F(x,y), and a=β at this time. However, in many cases, if the user wants to change the angle of the output light beam to deviate from the normal line symmetry, a set of blazed grating bias components needs to be included in the addressing data. Each modulation function must include this bias component, and this bias component is only related to the optical path environment and is not a necessary content of the modulation function algorithm. At this time, in addition to the target function, the outgoing light beam also needs to meet certain optical path characteristics. For example, in order to eliminate the influence of the zero-order light spot, the user hopes that the outgoing light beam will deviate from the zero order, that is, a is not equal to β. This difference is defined as Δ=a-β, called the bias component, which can be calculated by BP(x,y), so F(x,y)=AP(x,y)+BP(x,y). In this way, when AP changes, as long as BP does not change, the Δ value is a constant value. The change in BP value does not affect the functional target of AP, for example Figure 1 The example AP(x,y) is a vortex phase distribution diagram, and the change of its parameter topological charge has nothing to do with BP(x,y). The result of BP(x,y) only affects the angular position of the light beam.
[0003] Although the technology of adding a blazed grating or similar beam deflection algorithm to the host-based spatial light modulator control system to obtain the bias component is very mature, the additional calculations introduced make it impossible to decouple the addressing data from the device application scenario and lack universality. Changing the optical path environment may require recalculation, which brings system complexity. Since the addressing data is programmed by the host computer, the spatial light modulator itself cannot interact with external devices in real time and must be controlled through the host computer. This has disadvantages in the field of automated equipment and adaptive optical control. For example, it is impossible to directly realize the beam angle deflection through the level signal, or directly fix the beam exit angle bias at a certain value without repeated calculation. That is, the existing spatial light modulator is not convenient for automated control and does not have wide adaptability and ease of use. Summary of the invention
[0004] In order to solve the problem that the existing spatial light modulator is not convenient for automatic control and has limited applicability, the present invention provides a spatial light modulator and system, which separates the modulation data and the configurable parameter items, and builds the configurable parameter items into the spatial light modulator body, making it a hardware optional parameter item, which does not require the user to calculate separately and is easy to control, thereby making the spatial light modulation more widely adaptable and easy to use.
[0005] The present invention is achieved through the following technical solutions:
[0006] A first aspect of the present invention provides a spatial light modulator, comprising:
[0007] A first input interface for receiving a light beam spatial modulation data signal;
[0008] At least one second input interface for receiving configurable hardware parameter items, wherein the configurable hardware parameter items are at least one of a beam exit angle offset, an exit beam divergence angle offset, a spot focal length, a number of exit light beam splits, a base phase error, and a base phase error compensation value;
[0009] A control unit for generating addressing data according to the light beam spatial modulation data signal and configurable hardware parameter items;
[0010] A driving module drives the optical head according to the addressing data.
[0011] The inventors have found in long-term research that part of the addressing data algorithm of the beam modulation function is a fixed mode, which is only related to the application scenario and the optical path environment. This solution decouples the fixed mode and processes it in hardware, making the modulation function algorithm independent of the device and the environment, greatly changing the control mode of the spatial light modulator, and can simply and effectively control the spatial light modulator. By embedding the configurable hardware parameter item information into the spatial light modulator body, it becomes a hardware optional parameter item without the need for users to calculate it separately, which is easy to control, making spatial light modulation more widely adaptable and easy to use.
[0012] In one possible design, the control unit includes:
[0013] an addressing data processing module for confirming initial addressing data according to the light beam spatial modulation data signal;
[0014] A bias component calculation module for generating addressing data according to the hardware parameter item information and the initial addressing data.
[0015] The control unit of this solution can be implemented based on a single controller or a dual controller. The dual controller includes an addressing data processing module and a bias component calculation module, which are implemented based on different functions and can greatly improve the calculation speed.
[0016] In a possible design, the bias component calculation module is at least one of a Dammann grating function module, a Fresnel lens function module, a holographic mask function module, a blazed grating function module and an axicon function module.
[0017] In one possible design, the second input interface is a button interface, a knob interface, a GPIO interface or a PLC interface.
[0018] By using the above interface, multiple forms of data interaction can be realized, improving the convenience of operation.
[0019] In one possible design, the first input interface is an HDMI interface or a DVI interface.
[0020] In a possible design, the second input interface is connected to an adjustment component for adjusting the size of the hardware parameters in the hardware parameter item information.
[0021] This solution uses an adjustment component to directly adjust the size of hardware parameters in the hardware parameter item information, which is easy to operate.
[0022] In a possible design, the adjusting member is a knob or a button.
[0023] The second aspect of the present invention provides a spatial light modulation system, comprising a host computer for generating a light beam spatial modulation data signal and the spatial light modulator described in the first aspect and any possible embodiment thereof, wherein the first input interface of the spatial light modulator is connected to the signal output port of the host computer to receive the light beam spatial modulation data signal of the host computer.
[0024] Compared with the prior art, the present invention has at least the following advantages and beneficial effects:
[0025] 1. The present invention decouples the fixed mode and processes it in hardware, so that the modulation function algorithm is independent of the device and the environment, which greatly changes the control mode of the spatial light modulator and can simply and effectively control the spatial light modulator.
[0026] 2. By embedding the configurable hardware parameter item information into the spatial light modulator itself, it becomes a hardware optional parameter item, which does not need to be calculated separately by the user's host computer, making it easy to control, thereby making the spatial light modulation more widely adaptable and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.
[0028] Figure 1 This is a working principle diagram of the existing host computer and spatial light modulator.
[0029] Figure 2 It is a specific principle diagram of the spatial light modulator of the present invention.
[0030] Figure 3 yes Figure 2 An electrical schematic diagram corresponding to the specific schematic diagram.
[0031] Figure 4 This is a specific circuit schematic diagram of a second input port.
[0032] Figure 5 It is another specific principle diagram of the spatial light modulator of the present invention. DETAILED DESCRIPTION
[0033] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be noted that although the description of these embodiments is used to help understand the present invention, it does not constitute a limitation of the present invention. The specific structures and functional details disclosed herein are only used to describe the exemplary embodiments of the present invention. However, the present invention can be embodied in many alternative forms, and it should not be understood that the present invention is limited to the embodiments set forth herein.
[0034] It should be understood that the terms used herein are only used to describe specific embodiments and are not intended to limit the exemplary embodiments of the present invention. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that when the terms "include", "comprises", "includes", and / or "comprising" are used herein, they specify the existence of the claimed features, integers, steps, operations, units, and / or components, and do not exclude the existence or addition of one or more other features, quantities, steps, operations, units, components, and / or their combinations.
[0035] It should be understood that it should also be noted that in some alternative possible designs, the functions / actions that appear may be different from the order in which the drawings appear. For example, depending on the functions / actions involved, two figures shown in succession may actually be performed substantially concurrently, or may sometimes be performed in reverse order.
[0036] It should be understood that certain details are provided in the following description to facilitate a complete understanding of the example embodiments. However, one of ordinary skill in the art should understand that the example embodiments can be implemented without these specific details. For example, the system can be shown in a block diagram to avoid obscuring the example with unnecessary details. In other examples, well-known processes, structures, and techniques may not be shown in unnecessary detail to avoid obscuring the example embodiments.
[0037] A first aspect of the present invention discloses a spatial light modulator, comprising a first input interface, at least one second input interface, a control unit, a driving module, and an optical head connected to an output end of the driving module.
[0038] The first input interface is used to receive a beam spatial modulation data signal, which is generated by the user's host computer. The user's host computer only needs to generate beam spatial modulation data using the function AP (x, y). The first input interface is connected to the host computer and can be an HDMI interface or a DVI interface.
[0039] The second input interface is used to receive configurable hardware parameter items. The configurable hardware parameter items are separated from the user's host computer and built into the spatial light modulator. They are independent of the user's function function AP (x, y). As a universal configurable hardware parameter item, it is applicable to any user function function. Based on this idea, the configurable hardware parameter item can be not only a beam exit angle offset, but also a beam exit angle offset, an exit beam divergence angle offset, a spot focal length, an exit light beam splitting number, a base phase error, and a base phase error compensation value. The second input interface can be set to one or more according to the input method and the number of adjustment items of the configurable hardware parameter items. The beam exit angle offset, the exit beam divergence angle offset, the spot focal length, the exit light beam splitting number, the base phase error, and the base phase error compensation value are used as the hardware parameters of the spatial light modulator body, and the parameter quantity is adjusted through the second input interface. Specifically, the second input interface can be an electrical signal interface, a knob interface, or a key interface. When an electrical signal interface is used, it may be a GPIO interface or a PLC interface, which receives an external input electrical signal, thereby completing the definition of configurable hardware parameter items.
[0040] The control unit processes the light beam spatial modulation data signal received by the first input interface and the configurable hardware parameter item received by the second input interface to generate addressing data. The control unit can adopt a single controller or a dual controller mode according to the specific situation. That is, the light field function variable determined according to the application target is automatically superimposed with the light field function input by the user host computer to obtain a composite function.
[0041] The driving module drives the optical head according to the addressing data, and the optical head is connected to the output end of the driving module.
[0042] Based on the above principle, the following example is used to illustrate that two four input interfaces, a single controller is used as the control unit, and spatial light modulation can realize the setting of the light beam exit angle offset and the exit light beam divergence angle offset.
[0043] Reference Figure 2, including two second output ports A and B, a first output interface C, α is the angle between the incident light beam and the normal, β is the angle between the outgoing light beam and the normal, and γ is the divergence angle of the outgoing light beam. This solution solidifies the calculation process of the light beam exit angle offset and the outgoing light beam divergence angle offset into the control unit of the spatial light modulator body. The user host computer only needs to input the function function AP (x, y) result signal into the optical spatial modulation body to achieve the purpose of the traditional function function AP (x, y) plus BP (x, y), that is, the user addressing data F (x, y). In this embodiment, the interaction between the spatial light modulator and the external device or unit can be in a variety of forms, and a variety of interaction implementation means can be set according to the purpose. For example, the second input interface can adopt a key interface, a knob interface, a GPIO interface or a PLC interface to achieve the connection with the adjustment parts such as keys, knobs, and touch screens. The adjustment parts are used to adjust the size of the hardware parameters in the hardware parameter item information. The light beam exit angle offset and the outgoing light beam divergence angle offset are adjusted through the second output ports A and B respectively.
[0044] Specifically, the control unit can be implemented using FPGA and its peripheral circuits. Figure 3 As shown, the electrically erasable programmable read-only memory EEPROM, flash memory, etc. constitute the peripheral circuit, the interface IN1 and the interface IN2 constitute two second input ports respectively, and the HDMI / DVI interface constitutes the first input port. The second input port can be specifically configured as Figure 4 The specific circuit implementation shown in the figure. FPGA is used to realize the purpose of the function AP (x, y) plus BP (x, y). It has a fast calculation speed and has two built-in phase functions, one of which is a lens phase function used to control the beam exit angle and an optimized blazed grating phase function used to control the beam deflection angle. It can be quickly superimposed on the modulation data input by the host computer, thereby driving the display LCOS Panel to complete the beam modulation.
[0045] The control unit can be implemented with dual controllers, such as Figure 5As shown, it includes an addressing data processing module and a bias component calculation module. The addressing data processing module confirms the initial addressing data according to the beam spatial modulation data signal; the bias component calculation module generates addressing data according to the hardware parameter item information and the initial addressing data. The beam spatial modulation data signal input by the user is first processed by the addressing data processing module and then enters the bias component calculation module to confirm the addressing data, and finally inputs into the driving module to generate a driving signal to drive the optical head to complete the beam modulation function. When dual controllers are used, the addressing data processing module and the bias component calculation module are implemented by one controller. The addressing data processing module can be a digital signal processor DSP, a microcontroller unit MCU or other control unit; the bias component calculation module can be a field programmable gate array (FPGA) or firmware in the MCU. The calculation module firmware calculates the bias amount parameters of the spatial light modulator body, thereby changing the light beam spatial modulation data input by the user and generating a new modulation target function. This calculation module can be a known light field modulation function such as a Dammann grating function, a Fresnel lens function, a holographic mask function, a blazed grating function, an axon function, etc. The purpose is to use the calculation part of the determined functional target as the hardware parameter of the spatial light modulator, so as to achieve decoupling from the user modulation data. Correspondingly, the bias component calculation module is at least one of a Dammann grating function module, a Fresnel lens function module, a holographic mask function module, a blazed grating function module and an axon function module.
[0046] The second aspect of the present invention provides a spatial light modulation system, comprising a host computer for generating a light beam spatial modulation data signal and a spatial light modulator as described in any possible aspect of the first aspect, wherein a first input interface of the spatial light modulator is connected to a signal output port of the host computer to receive the light beam spatial modulation data signal of the host computer. The operating principle of the system has been described in detail in the first aspect and will not be repeated here.
[0047] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention is described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A spatial light modulator, characterized in that: include: A first input interface for receiving a light beam spatial modulation data signal, wherein the first input interface is used to receive the light beam spatial modulation data signal, wherein the light beam spatial modulation data signal is generated by a user's host computer, and the user's host computer generates the light beam spatial modulation data through a function AP(x, y); At least one second input interface for receiving configurable hardware parameter items, wherein the configurable hardware parameter items are at least one of a beam emission angle offset, an emission beam divergence angle offset, a spot focal length, a number of emission light beam splits, a base phase error, and a base phase error compensation value. The configured hardware parameter items are separated from the user's host computer, built into the spatial light modulator, and are independent of the user's function function AP (x, y). As a universal configurable hardware parameter item, they are applicable to any user function function; a control unit for generating addressing data according to the light beam spatial modulation data signal and configurable hardware parameter items; wherein the control unit comprises: an addressing data processing module for confirming initial addressing data according to the light beam spatial modulation data signal; a bias component calculation module for generating addressing data according to the hardware parameter item information and the initial addressing data; a driving module for driving the optical head according to the addressing data; An optical head is connected to the driving module.
2. A spatial light modulator according to claim 1, characterized in that: The bias component calculation module is at least one of a Dammann grating function module, a Fresnel lens function module, a holographic mask function module, a blazed grating function module and an axicon function module.
3. The spatial light modulator according to claim 1, characterized in that: The second input interface is a button interface, a knob interface, a GPIO interface or a PLC interface.
4. The spatial light modulator according to claim 1, characterized in that: The first input interface is an HDMI interface or a DVI interface.
5. The spatial light modulator according to claim 1, characterized in that: The second input interface is connected with an adjusting component for adjusting the size of the hardware parameters in the hardware parameter item information.
6. A spatial light modulator according to claim 5, characterized in that: The adjusting member is a knob or a button.
7. A spatial light modulation system, characterized in that: It comprises a host computer for generating a light beam spatial modulation data signal and a spatial light modulator as described in any one of claims 1 to 6, wherein a first input interface of the spatial light modulator is connected to a signal output port of the host computer to receive the light beam spatial modulation data signal of the host computer.