CN111240028A - Dynamic light field generating method and generating device - Google Patents
Dynamic light field generating method and generating device Download PDFInfo
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Abstract
The invention discloses a dynamic light field generation method and a device, belonging to the technical field of space light, wherein the method comprises the following steps: establishing a spatial light-Field function Field ═ F (P1, P2, P3 … Pn) for the output light, where P1, P2, P3 … Pn denote the tunable optical properties of the output light; establishing a first mapping function between the spatial light field function F and the input electric signal; establishing a second mapping function for the spatial light field function F and the addressing function; the dynamic light beam modulation unit receives input light and an input electric signal, wherein the input light is a rectangular light beam; obtaining a spatial light field function determined by optical properties according to the first mapping function; obtaining an addressing address according to the second mapping function and the space light field function determined by the optical property; the dynamic beam modulation unit is addressed according to an addressing address to change the adjustable optical characteristic of the output light to generate the desired light field. The invention has reasonable design and easy operation, and can modulate the output light through simple input electric signal change.
Description
Technical Field
The present invention relates to a dynamic light field generating method and a generating device.
Background
In industrial laser development and application scenarios, it is often necessary to shape the far-field spot to improve beam quality or to obtain a specific pattern of spots, such as a flat-top spot, a long focal depth spot, etc. The traditional technical means is to use optical elements such as DOE elements or free-form surface lenses and the like, and the traditional technical means has the defect that the light spot form is limited by light path elements, and once the light path elements are fixed, the light spot form can not be changed, so that the light spot form belongs to a static light path.
Spatial Light Modulator (SLM) based optical shaping systems are a common dynamic beam shaping system in research. The spatial light modulator is a device for modulating the spatial distribution of light waves, and comprises a plurality of independent units which are spatially arranged into a one-dimensional or two-dimensional array, each unit can independently receive the control of optical signals or electric signals and change the optical properties (light field parameters such as transmissivity, reflectivity, refractive index and the like) of the unit according to the signals, so that the light waves irradiated on the unit are modulated, and further the required light field is obtained.
The optical or electrical signals mentioned above are referred to as control input signals (write signals), which usually contain information for controlling the cells of the SLM and which are transferred to the corresponding cell locations of the SLM to change their optical properties. The process of transferring information to corresponding positions on the SLM by the write signal to change the transmittance distribution of the SLM is called addressing, and the spatial light modulator can be classified into optical addressing (0A-SLM) and electrical addressing (EA-LSM) according to the way of controlling the input signal.
In the prior art, a spatial light modulator uses optical head modules such as LCoS, DMD, MEMS and other optoelectronic devices as cores to complete an optical modulation function, control signals are input to the spatial light modulator in a PCIe manner, and the content of the control signals is processed by an upper computer. However, the spatial light modulator needs to be controlled by an input signal of an upper computer, and is difficult to be integrated with a laser. Meanwhile, because the light field regulation and control technology needs programming or control software, the software is not easy to be understood by common operators in factories, and the requirements on the technical capability of laser equipment generation or debugging personnel are high, therefore, the direct application of the existing spatial light modulator technology to large-scale equipment production and generation is very troublesome, and the problem of the simplification and the simplification of the operation mode for regulating and controlling the light field is urgently needed to be solved.
Therefore, it is necessary to develop a simple controllable and easily integrated optical field generating device for use in a laser or integrated into a laser application apparatus. The device can be used as an embedded component of a laser and can also be used as an external device, so that the laser can generate a special purpose optical field. The invention provides a laser dynamic optical field generator device based on a beam shaping technology and a dynamic modulation technology of a spatial light modulator by means of combining a hardware circuit and an optical path. The device can be used as an internal component of an industrial laser, particularly a low-power laser, can be directly applied to laser product development, and can also be used as an additional component of the existing laser application equipment to replace a fixed optical element and be applied to different laser equipment.
Disclosure of Invention
The invention aims to provide a dynamic light field generating method and a generating device, aiming at the problem that the shape of a light spot emitted after an optical path element is fixed in the prior art is fixed, so that flexible adjustment is difficult.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a dynamic light field generation method comprising the steps of:
step 2, the dynamic light beam modulation unit receives input light and an input electric signal, wherein the input light is a rectangular light beam;
step 3, obtaining a space light field function determined by optical properties according to the first mapping function in the step 1;
and 5, addressing by the dynamic light beam modulation unit according to the addressing address obtained in the step 4 to change the adjustable optical characteristics of the output light so as to generate a required light field.
Preferably, the input electrical signal is one or more of a level signal, a switching signal and a command signal.
Preferably, in the step 1, the mapping relationship is defined by a spatial multiplexing phase function; in step 2, the dynamic beam modulation unit invokes the spatial multiplexing phase function to process the input electrical signal and generate the addressing address.
Preferably, the input light is split into P-polarized light and S-polarized light by a polarization splitting prism; the P-polarized light is emitted to the dynamic beam modulation unit; the S-polarized light is transmitted to a solid imaging sensor that collects optical properties of input light carried by the S-polarized light in order to adjust the input electrical signal.
On the other hand, the invention also provides a dynamic light field generating device, which comprises a structure carrier, and a control module, an interactive interface and a light path structure which are arranged on the structure carrier;
the light path structure comprises a support frame, and a polaroid, a rectangular light spot shaping unit, a front optical 4f system, a dynamic light beam modulation unit and a rear optical 4f system which are sequentially distributed on the support frame according to a light path propagation path; the polaroid is used for polarizing incident beams into linearly polarized light, the rectangular light spot shaping unit is used for shaping the linearly polarized light into rectangular light spots, and the front optical 4f system is used for transmitting the rectangular light spots to the dynamic light beam modulation unit without distortion;
the interactive interface is used for collecting input electric signals; the control module is used for receiving the input electric signal, processing the input electric signal and then sending an addressing address to the dynamic light beam modulation unit; the dynamic light beam modulation unit is used for addressing according to the addressing address so as to modulate output light in a required form; the rear optical 4f system is used for emitting the output light without distortion.
Preferably, the dynamic light beam modulation unit is an electric control phase modulation unit of an LCOS chip; the control module comprises Firmware embedded with a spatial multiplexing phase function, and the input electric signal establishes a mapping relation with the adjustable optical property of output light through the Firmware; the interactive interface comprises one or more of a GPIO interface, a serial port and a dial switch.
Preferably, the optical path structure further includes a polarization splitting prism and a solid-state imaging sensor mounted on the support frame, and the polarization splitting prism is disposed between the front optical 4f system and the dynamic beam modulation unit; the polarization beam splitter prism is used for dividing the light that preceding optics 4f system sent into P polarisation and S polarisation, P polarisation is sent for dynamic light beam modulation unit, S polarisation is sent for solid imaging sensor, fixed imaging sensor gathers the optical property of the input light that S polarisation carried, so that the adjustment the input signal of telecommunication.
Preferably, the rectangular light spot shaping unit includes a rectangular shaping mirror, an incident end face and an emergent end face of the rectangular light spot shaping mirror are hyperbolic cylindrical surfaces, and a ridge line of the incident end face and a ridge line of the emergent end face are perpendicular to each other.
Preferably, the structure carrier comprises an optical chamber and an electrical chamber which are independent and sealed, the optical path structure is installed in the optical chamber, the optical chamber is provided with an incident port and an exit port, and the control module is installed in the electrical chamber; and the outer wall of the optical bin is provided with a heat dissipation module.
Preferably, the optical path structure further includes a wave plate, the wave plate is mounted on the support frame, and the wave plate is located between the front optical 4f system and the dynamic beam modulation unit.
By adopting the technical scheme, the emergent light field can be modulated only by changing the external output signal, so that the form of the emergent light field is not limited to the configuration of the light path element, and the adjustability and the flexibility of the form of the emergent light field are greatly improved.
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 front view of a dynamic light field generating device according to the present invention;
FIG. 2 is a side view of a dynamic light field generating device of the present invention;
FIG. 3 is a schematic diagram of an optical path structure in a dynamic optical field generator according to the present invention;
FIG. 4 is a schematic circuit diagram of a dynamic optical field generator according to the present invention.
In the figure, the device comprises a 10-structure carrier, a 20-control module, a 30-interaction interface, a 40-optical path structure, a 1-polarizing plate, a 2-rectangular light spot shaping unit, a 21-rectangular shaping mirror, a 22-first beam expanding lens, a 23-filtering square hole, a 3-front optical 4f system, a 304-second beam expanding lens, a 4-dynamic light beam modulation unit, a 5-rear optical 4f system, a 6-polarization beam splitter prism, a 7-solid imaging sensor, an 8-right-angle reflecting prism, a 101-optical bin, a 102-electrical bin, a 103-power supply and communication interface and a 104-video socket.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on structures shown in the drawings, and are only used for convenience in describing the present invention, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the technical scheme, the terms "first" and "second" are only used for referring to the same or similar structures or corresponding structures with similar functions, and are not used for ranking the importance of the structures, or comparing the sizes or other meanings.
In addition, unless expressly stated or limited otherwise, the terms "mounted" and "connected" are to be construed broadly, e.g., the connection may be a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two structures can be directly connected or indirectly connected through an intermediate medium, and the two structures can be communicated with each other. To those skilled in the art, the specific meanings of the above terms in the present invention can be understood in light of the present general concepts, in connection with the specific context of the scheme.
Example one
A dynamic light field generation method comprising the steps of:
step 2, receiving input light and a plurality of input electric signals, wherein the input light is a rectangular light beam;
step 3, obtaining variables of the space light field function according to the first mapping function and the plurality of input electric signals;
and 5, addressing according to the addressing address obtained in the step 4 to obtain a variable value of the space light field function so as to modulate the variable value into required output light.
First, as a basic principle, the dynamic light beam modulation unit of the present invention is an LCOS chip-based electrically controlled phase modulation element, which is usually used as a core element of a spatial light modulator, so it can be understood that the technical solution of the present invention is based on the use and development of the spatial light modulator. The spatial light modulator generally includes a plurality of modules, such as a data interface, a data storage, an instruction controller, an addressing module, an optical head of the spatial light modulator, a driving module, a GPIO interface, a memory module, and a power supply and basic configuration module, according to different application scenarios.
The invention emphasizes the following modules: a data interface and a GPIO interface, which are used for inputting electric signals and generally outputting the electric signals outwards; a data storage and memory module for storing relevant data; an addressing module for generating an addressing address; the driving module is used for receiving the addressing address provided by the addressing module and driving the optical head of the spatial light modulator to work; and the spatial light modulator optical head is used for adjusting each unit of the SLM under the driving of the driving module so as to output a required light field (with specific optical properties). Of course, the necessary power supply and basic configuration modules are also included.
Specifically, first, a spatial light Field function needs to be established for the output light, where Field is F (P1, P2, P3 … Pn), where P1, P2, and P3 … Pn indicate various adjustable optical properties (parameters) of the output light, and the spatial light Field can be adjusted by changing any one or more of the parameters.
However, in practical application, the form of the space light field is only related to the addressing address, so it can be understood that if the space light field function F is to be adjusted, the addressing address must be adjusted; while the generation of the addressing address is directly related to the input electrical signal entered by the user. Therefore, the invention sets a plurality of input electric signals, when each input electric signal changes, the addressing result of the generated new addressing address is as follows: the spatial light field function F has one and only one parameter that changes. Therefore, the form of the output light can be associated with the input electric signal one by one, the operation is convenient, and the defect that in the traditional technology, various parameters of the output light can be adjusted only by compiling complex programs is avoided.
In this embodiment, since the spatial light field functions of the input electrical signal and the output light have a mapping relationship, when an operator changes an input electrical signal, the dynamic light beam modulation unit knows which light field parameter in the spatial light field functions it needs to adjust, so as to obtain a determined spatial light field function;
then only one addressing address is required to be obtained, and the result of addressing by the dynamic light beam modulation unit according to the addressing address is that the optical property of the output light conforms to the determined space light field function;
in this embodiment, the addressing address is obtained by an addressing function, so that the addressing address can be obtained according to the determined spatial light field function only by establishing a mapping relationship between the spatial light field function and the addressing function; addressing the address to obtain required space light field; in the embodiment, the addressing function and the spatial light field function establish a corresponding mapping relationship through the combined action of the spatial multiplexing phase function and the determined optical properties of the spatial light field.
In this embodiment, the input electrical signal is one or more of a level signal, a switch signal, and an instruction signal, and is specifically represented as a TTL level signal, a serial port, an optocoupler signal, or a grating scale displacement signal. Therefore, an operator can issue a modulation command to the dynamic beam modulation unit through simple external hardware operation equipment, and the operation is convenient and fast. For example, when the input electrical signal is a PWM level signal, the frequency of the PWM level signal is high or low, and the duty ratio parameter is mapped with the outgoing light field parameter through a mapping relationship, and the mapping relationship is directly externally connected to the electronic interaction device such as the trigger button, the grating scale, the PLC module, the rotary switch, and the handle through the voltage and current parameters, so that the operation of an operator is facilitated.
Therefore, the above process can be simplified and described as that, after an electrical signal, for example, a certain PWM level signal, is input, a spatial light field function determined by the optical property is obtained according to the first mapping function (specifically, the corresponding optical property is determined), a determined addressing function (i.e., an addressing address) is obtained through the joint action of the spatial multiplexing phase function and the determined optical property, and the spatial light field function determined by the optical property is obtained after the addressing address is addressed (i.e., the optical property of the output light meets the expectation). The spatial multiplexing phase function may be, for example, a bessel beam phase distribution function or a spatial multiplexing multifocal phase distribution function, and the like, to obtain a multifocal light field with different focal depths, a multifocal light field with different focal XY positions, a double bessel light field array, and the like, where the parameter representing the spatial light field function may be an optical parameter such as the number of focal points, the depth of focal point, and the like.
Example two
The difference from the first embodiment is that: in this embodiment, the input light is divided into P-polarized light and S-polarized light by a polarization splitting prism; the P-polarized light is emitted to the dynamic beam modulation unit; the S-polarized light is transmitted to a solid imaging sensor that collects the optical properties of the input light carried by the S-polarized light in order to provide a basis for adjusting the input electrical signal.
Meanwhile, whether the position of the polarization beam splitter prism is accurate or not can be judged according to data displayed by the fixed imaging sensor, and therefore the dynamic light beam modulation unit can obtain irradiation of input light.
EXAMPLE III
As shown in fig. 1-4, the present invention further provides a dynamic light field generating device, which includes a structure carrier 100, and a control module 20, an interactive interface 30 and an optical path structure 40 mounted on the structure carrier 100. Wherein, the structure carrier 100 comprises an optical chamber 101 and an electrical chamber 102 which are independent and sealed; the optical path structure 40 is installed in the optical chamber 101, the optical chamber 101 is provided with an entrance port for the incident light beam to enter and an exit port for the exit light field to exit, and the entrance port and the exit port are both provided with transparent protective glass; the control module 20 is installed in the electrical bin 102; while the interactive interface 30 described above is disposed on the electrical cartridge 102. It can be understood that the side wall of the electrical cabin 102 is further provided with a power supply and communication interface 103, and the power supply and communication interface can be separately provided or integrally provided.
As shown in fig. 3, the optical path structure 40 includes a support frame 10, and a polarizer 1, a rectangular spot shaping unit 2, a front optical 4f system 3, a dynamic beam modulation unit 4, and a rear optical 4f system 5 sequentially distributed on the support frame 10 according to an optical path propagation path, and the optical elements are fixed on the support frame 10 by gluing, and fixing by mechanical locking.
The polarizer 1 is used, among other things, to polarize an incident light beam (e.g., a common circular spot) into linearly polarized light.
The rectangular light spot shaping unit 2 is used for shaping the linearly polarized light into a rectangular light spot; specifically, the rectangular light spot shaping unit 2 comprises a rectangular shaping mirror 21, and a light beam with a round light spot is changed into a light beam with a rectangular light spot after passing through the rectangular shaping mirror 21, so that the light beam becomes the rectangular light spot;
in this embodiment, the rectangular light spot shaping unit 2 includes a rectangular shaping mirror 21, an incident end surface and an emergent end surface of the rectangular light spot shaping mirror 21 are hyperbolic cylindrical surfaces, and a ridge line of the incident end surface and a ridge line of the emergent end surface are perpendicular to each other. Or in another embodiment, a first expander lens 22 and a square filter hole 23 may be sequentially disposed behind the rectangular shaping mirror 21, and the square filter hole 23 may be understood as a through hole disposed in a plate, such that the size of the rectangular light spot emitted from the rectangular shaping mirror 21 can be enlarged by the first expander lens 22, and the enlarged rectangular light spot is cleaner and less noisy after passing through the square filter hole 23.
The front optical 4f system 3 is used to deliver the amplified and filtered rectangular spot undistorted into the dynamic beam modulation unit 4.
The interactive interface 30 is used for collecting input electrical signals, and includes one or more of a GPIO interface, a serial port, and a toggle switch.
The control module 20 is used for receiving the input electrical signal and sending an addressing address to the dynamic beam modulation unit 4; the control module comprises Firmware embedded with a spatial multiplexing phase function, and the input electric signal establishes a mapping relation with the adjustable optical property of the output light through the Firmware.
The dynamic light beam modulation unit 4 is used for receiving the rectangular light spots emitted by the front optical 4f system 3 on one hand, and modulating the space light according to the addressing address on the other hand, so as to generate output light in a required form; in this embodiment, the dynamic light beam modulation unit includes an electric control phase modulation unit based on an LCOS chip, and a corresponding driving module and an addressing module, which act together to enable the dynamic light beam modulation unit 4 to modulate input light according to an input electrical signal and emit required output light.
The rear optical system 4f 5 is used to emit the emitted light field without distortion.
As shown in fig. 4, the control module 20 includes a circuit board and an embedded control circuit, such as an FPGA (field programmable gate array), mounted on the circuit board, where the embedded control circuit is loaded with Firmware programs, where the Firmware programs include spatially multiplexed phase functions, such as a bessel beam function, a multi-focus beam function, and a fresnel phase function, used as a mature technology, and a mapping relationship between optical parameters of an input electrical signal and output light and a mapping relationship between a spatial light field function of output light and an addressing function are defined by a protocol, so that after the input electrical signal changes, the dynamic light beam modulation unit 4 obtains light field parameter data of corresponding output light and modulates the required output light by generating a corresponding addressing address.
Specifically, the input electrical signal is a TTL level signal, a serial port, an optocoupler signal or a grating scale displacement signal, for example, when the input electrical signal is a PWM level signal, the frequency of the PWM level signal is high or low, and the duty ratio parameter is mapped with the outgoing light field parameter through a mapping relationship, and the mapping relationship is directly externally connected to the electronic interaction device such as the trigger key, the grating scale, the PLC module, the rotary switch, and the handle through voltage and current parameters, so that the operation of an operator is facilitated.
In the acquisition of the input electrical signals, the interaction interface 30 is set to be a GPIO interface in the present embodiment, and is fixed to the electrical cabin 102 by using an aviation plug, and because there are various optical field parameters, such as the number of focuses and the distance between the focuses, there need to be two corresponding types of input electrical signals, that is, two interaction interfaces 30 need to be set for respectively acquiring two input electrical signals.
As shown in fig. 4, for example, in an embodiment provided by the present invention, the dynamic beam modulation unit 4 is an electrically controlled phase modulation element based on an LCOS chip, the size of an active area of the LCOS chip is 15.4 × 9.6mm, the LCOS chip operates at a wavelength of 532nm, and the entire optical circuit component is coated with a film with a wavelength of 532 nm; as shown in the circuit diagram of fig. 3, the FPGA carries an algorithm program, and two parameters are designed for the optical field: the number of focal points and the focal point spacing. When an operator adjusts the duty ratios of the two paths of PWM level signals through a knob, the two paths of PWM level signals are input into the FPGA through two GPIO interfaces, wherein the duty ratio of one path of PWM level signal corresponds to the parameter of the number of focuses, and the duty ratio of the other path of PWM level signal corresponds to the parameter of the focus distance; the driving module in the FPGA generates an addressing address, the addressing address is input into the LCOS chip through an FPC (flexible circuit), and the LCOS chip completes spatial phase modulation (modulating the number of focuses and the distance between the focuses of an optical field) according to the addressing address, so that the 3D distribution of far-field light spots is obtained to be in line with multi-focus distribution.
Or, in another embodiment provided by the present invention, the phase modulation program for generating the vortex beam is programmed in the program algorithm loaded by the FPGA, so that the vortex beam can be obtained. In this embodiment, 3 BNC interfaces are provided, and the 3 BNC interfaces are connected to an operation handle as the interactive interface 30. The two input signals generated by the action of the operating handle in the X direction and the Y direction respectively correspond to the parameter of the number of the focuses and the parameter of the focal distance, and the input signal generated by the action of the operating handle roller corresponds to the parameter of the radius of the emergent light field. Thus, the position and the radius of the vortex light beam can be moved.
Or, in another embodiment provided by the present invention, an FPGA JTAG interface may be added to the FPGA, so that the firmware program is updated through the interface, and the outgoing light field has more changeability, thereby greatly enriching application scenarios.
In addition, in the present embodiment, the Polarization Beam Splitter (PBS)6 and the solid-state imaging sensor 7 are further included, which are mounted on the support frame 10. Wherein, a polarization beam splitter prism 6 is arranged between the front optical 4f system 3 and the dynamic beam modulation unit 4, and the polarization beam splitter prism 6 is used for splitting the light emitted by the front optical 4f system 3 into two beams, specifically P-polarized light (parallel to the incident light direction) and S-polarized light (perpendicular to the incident light direction). The P-polarized light is configured to be sent to the dynamic beam modulation unit 4 for being processed to generate the outgoing light field as described above. And the S-polarized light is configured to be transmitted to the solid-state imaging sensor 7 described above, and the fixed imaging sensor 7 is used to acquire wavefront phase information carried by the S-polarized light. On one hand, under the condition that the fixed imaging sensor 7 is fixed, the angle and the position of incident light can be found and positioned by analyzing the detected S polarized light, so that a basis is provided for adjusting the angle and the position of the incident light, and a video socket 104 is arranged for debugging the use of an optical path, as shown in FIG. 2; on the other hand, when the incident light beam changes, the control module 20 receives the wavefront phase information of the incident light beam detected by the solid-state imaging sensor 7, so that the mapping relationship between the input electrical signal and the left and right spatial modulation parameters can be accurately and timely adjusted, and the operator can change the amplitude of the input electrical signal and still conform to the change of the incident light field form. In this embodiment, the solid-state imaging sensor 7 is preferably a CMOS detector or a CDD detector.
In this embodiment, the optical path structure 40 further includes a wave plate 9, the wave plate 9 is firstly installed on the support frame 10, and the wave plate 9 is located between the front optical system 4f 3 and the dynamic beam modulation unit 4, specifically, the wave plate 9 is located between the dynamic beam modulation unit 4 and the polarization splitting prism 6.
In this embodiment, since the optical path structure 40 generates heat during use, a heat dissipation module for dissipating heat is mounted on the optical chamber 101, and the optical chamber 101 is made of a metal material with a low thermal expansion coefficient, such as invar steel, as shown in fig. 1.
As shown in fig. 3, due to the arrangement of the polarization splitting prism 6, the outgoing light field generated by the dynamic light beam modulation unit 4 is not directly emitted to the outside of the support frame 10, but is reversely emitted to the polarization splitting prism 6 and is reflected by 90 °, and the reflection direction thereof is opposite to the S polarization direction described above. Thus, it can be understood that the rear optical 4f system 5 needs to be arranged in the direction in which the outgoing light field is reflected.
It can be understood that, in order to make the spot size of the light beam better adapt to each optical element during the transmission process, in this embodiment, a second beam expanding lens 304 is also disposed between the front optical system 4f 3 and the dynamic light beam modulation unit 4, so as to enlarge the spot size of the light beam and enable the optical target surface of the dynamic light beam modulation unit 4 to obtain better illumination.
Meanwhile, if the light beam is transmitted along a straight line all the time in the light path structure, the length of the light path structure may be too large, and therefore, in the present embodiment, a certain number of reflectors are disposed on the transmission path of the light beam, and preferably, the reflectors are right-angle reflecting prisms 8, and preferably, three reflectors are disposed, each right-angle reflecting prism 8 is capable of reflecting the light beam by 90 °, wherein two right-angle reflecting prisms 8 are disposed at the front side and the rear side of the second beam expanding lens 304, respectively, so that the light beam is turned back by 180 °, and the third right-angle reflecting prism 8 is disposed between the polarization beam splitting prism 6 and the rear optical 4f system 5, so that the emergent light field is bent again by 90 °, and is reflected toward a direction away from the dynamic light beam modulation unit 4.
When the device is used, incident light is usually circular light spots emitted by laser, the circular light spots firstly enter the closed optical bin 101 through the incident port and irradiate on the polaroid sheet 1, the circular light spots are polarized into linearly polarized light by the polaroid sheet 1, and the linearly polarized light continuously passes through the rectangular light spot shaping unit 2, so that the light beam form of the linearly polarized light changes from circular to rectangular, meanwhile, the size of the rectangular light spots is amplified, and noise is filtered; the rectangular light spot is reflected by a right-angle reflecting prism 8 for 180 degrees, amplified by a second beam expanding lens 304 and sent to a dynamic light beam modulation unit 4 by an optical 4f system 3 without distortion; meanwhile, after an operator operates an input electrical signal, such as a certain PWM level signal, which is input to the control module 20 through an interactive interface 30, the control module 20 defines the PWM level signal according to the loaded spatial multiplexing phase function thereof, so as to generate an addressing address according to an interface protocol thereof and send the addressing address to an electric control phase modulation element based on the LCOS chip; after an electric control phase modulation element based on the LCOS chip receives an addressing address, the left and right space modulation parameters are correspondingly changed according to the mapping relation; the LCOS chip-based electric control phase modulation element modulates the wave front phase information of the rectangular light spot according to the changed left and right spatial modulation parameters, so as to generate emergent light fields in different forms. Therefore, when an operator wants to change the shape of the emergent light field, only a certain PWM level signal needs to be adjusted.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.
Claims (10)
1. A dynamic light field generation method, characterized by: the method comprises the following steps:
step 1, establishing a spatial light Field function Field (F) (P1, P2, P3 … Pn) for the output light modulated and emitted by the dynamic beam modulation unit, wherein P1, P2, and P3 … Pn indicate various adjustable optical properties of the output light; establishing a first mapping function between the spatial light field function F and an input electrical signal; establishing a second mapping function for the spatial light field function F and the addressing function;
step 2, the dynamic light beam modulation unit receives input light and an input electric signal, wherein the input light is a rectangular light beam;
step 3, obtaining a space light field function determined by optical properties according to the first mapping function in the step 1;
step 4, obtaining an addressing address according to the second mapping function in the step 1 and the space light field function determined by the optical property in the step 3;
and 5, addressing by the dynamic light beam modulation unit according to the addressing address obtained in the step 4 to change the adjustable optical characteristics of the output light so as to generate a required light field.
2. The dynamic light field generation method according to claim 1, characterized in that: the input electric signal is one or more of a level signal, a switch signal and a command signal.
3. The dynamic light field generation method according to claim 1, characterized in that: in the step 1, the mapping relation is defined by a spatial multiplexing phase function; in step 2, the dynamic beam modulation unit invokes the spatial multiplexing phase function to process the input electrical signal and generate the addressing address.
4. A dynamic light field generation method according to any one of claims 1 to 3, characterized in that: the input light is divided into P polarized light and S polarized light through a polarization beam splitter prism; the P-polarized light is emitted to the dynamic beam modulation unit; the S-polarized light is transmitted to a solid imaging sensor that collects optical properties of input light carried by the S-polarized light in order to adjust the input electrical signal.
5. A dynamic light field generating device, characterized by: the system comprises a structure carrier, and a control module, an interactive interface and an optical path structure which are arranged on the structure carrier;
the light path structure comprises a support frame, and a polaroid, a rectangular light spot shaping unit, a front optical 4f system, a dynamic light beam modulation unit and a rear optical 4f system which are sequentially distributed on the support frame according to a light path propagation path; the polaroid is used for polarizing incident beams into linearly polarized light, the rectangular light spot shaping unit is used for shaping the linearly polarized light into rectangular light spots, and the front optical 4f system is used for transmitting the rectangular light spots to the dynamic light beam modulation unit without distortion;
the interactive interface is used for collecting input electric signals; the control module is used for receiving the input electric signal, processing the input electric signal and then sending an addressing address to the dynamic light beam modulation unit; the dynamic light beam modulation unit is used for addressing according to the addressing address so as to modulate output light in a required form; the rear optical 4f system is used for emitting the output light without distortion.
6. The dynamic light field generating device according to claim 5, wherein: the dynamic light beam modulation unit is an electric control phase modulation unit of the LCOS chip; the control module comprises Firmware embedded with a spatial multiplexing phase function, and the input electric signal establishes a mapping relation with the adjustable optical property of output light through the Firmware; the interactive interface comprises one or more of a GPIO interface, a serial port and a dial switch.
7. The dynamic light field generating device according to claim 5, wherein: the light path structure further comprises a polarization beam splitter prism and a solid imaging sensor which are arranged on the support frame, and the polarization beam splitter prism is arranged between the front optical 4f system and the dynamic light beam modulation unit; the polarization beam splitter prism is used for dividing the light that preceding optics 4f system sent into P polarisation and S polarisation, P polarisation is sent for dynamic light beam modulation unit, S polarisation is sent for solid imaging sensor, fixed imaging sensor gathers the optical property of the input light that S polarisation carried, so that the adjustment the input signal of telecommunication.
8. The dynamic light field generating device according to claim 5, wherein: the rectangular light spot shaping unit comprises a rectangular shaping mirror, the incident end face and the emergent end face of the rectangular light spot shaping mirror are hyperbolic cylindrical surfaces, and the ridge line of the incident end face is perpendicular to the ridge line of the emergent end face.
9. The dynamic light field generating device according to claim 5, wherein: the structure carrier comprises an optical bin and an electrical bin which are mutually independent and sealed, the optical path structure is installed in the optical bin, an incident port and an emergent port are formed in the optical bin, and the control module is installed in the electrical bin; and the outer wall of the optical bin is provided with a heat dissipation module.
10. The dynamic light field generating device according to claim 5, wherein: the light path structure further comprises a wave plate, the wave plate is installed on the support frame, and the wave plate is located between the front optical 4f system and the dynamic light beam modulation unit.
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| PCT/CN2021/076861 WO2021175118A1 (en) | 2020-03-06 | 2021-02-19 | Dynamic light field generation method and generation device |
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| CN113867013A (en) * | 2021-09-02 | 2021-12-31 | 帛度光电科技(苏州)有限公司 | Spatial light modulator and system |
| CN115120187A (en) * | 2021-03-29 | 2022-09-30 | 上海近观科技有限责任公司 | Device, system and method for detecting internal signal of biological tissue |
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