CN105676498B - The amplitude modulation method and device of pure phase type spatial light modulator - Google Patents
The amplitude modulation method and device of pure phase type spatial light modulator Download PDFInfo
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- CN105676498B CN105676498B CN201610170245.8A CN201610170245A CN105676498B CN 105676498 B CN105676498 B CN 105676498B CN 201610170245 A CN201610170245 A CN 201610170245A CN 105676498 B CN105676498 B CN 105676498B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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Abstract
The present invention relates to a kind of amplitude modulation methods and device of pure phase type spatial light modulator.The method includes：Obtain the quantity N of the spatial light modulator pixeltotal*Mtotal, multiple subregions are classified as, the pixel quantity of all subregion is N*M, is multiple 1*2 modulation units by the N*M pixel random division；The incident light phase of two adjacent pixels in the modulation unit is modulated, is superimposed by the interference of the adjacent pixel output light or the amplitude modulation for realizing modulation unit is offset in interference；Using the amplitude phase inter-modulation between each modulation unit on subregion, to realize the modulation of multiple tonal gradations in the spatial light modulator.Amplitude modulation device provided by the invention is realized using above-mentioned amplitude modulation method.The present invention can not only make pure phase bit-type spatial light modulator realize phase-only modulation and the amplitude modulation without phase coupling estimation, can also realize phase and the mutually independent combined modulation of amplitude.
Description
Technical field
The present invention relates to shaking without phase coupling estimation for optical technical field more particularly to a kind of pure phase type spatial light modulator
Width modulation and phase and the mutually independent combined modulation method and device of amplitude.
Background technology
Spatial light modulator be it is a kind of can be to the device that spatial beam is modulated, for by pending raw information
It is processed into required form.Spatial light modulator is made of a series of independent units, and each of which unit can pass through input
Electric signal or optical signal are modulated the optical signal of system, and change the optical characteristics of its own according to control input signal,
To realize that these units are also referred to as pixel to spatial light wave modulation.
According to the difference of addressing system, spatial light modulator can be divided into electrical addressing spatial light modulator and light addressing space light
Modulator, wherein electrical addressing spatial light modulator are loaded into electric signal on modulator by a pair of electrodes, light addressing space light
The light distribution of optical signalling can be then converted into the distribution of charge or the distribution of refractive index etc. by modulator.According to output light
The way of output is different, and spatial light modulator can be divided into reflective spatial light modulator and transmissive spatial optical modulator, wherein
The input light of transmissive spatial optical modulator is with output light in modulator both sides (shown in such as Fig. 1 (a)), Reflective spatial light modulation
The input light of device is with output light at modulator homonymy (shown in such as Fig. 1 (b)).The present invention can be used to transmission-type and can also be used for reflecting
Type.
Spatial light modulator is mainly used in imaging, projection, beam splitter, laser beam reshaping, relevant wavefront modification, phase
Modulation, optical tweezers, line holographic projections, shaping for laser pulse etc. are real-time optical information processing, adaptive optics and optical oomputing etc.
The Primary Component in contemporary optics field.The performance of spatial light modulator largely influences and determines the reality in these fields
With value and development prospect, and it is also the very high optical device of cost accounting in various optical systems, modulator approach is to influence
Its important factor in order in the practical application of each optical technology.The material of spatial light modulator is mostly liquid crystal, basic
Modulation principle is, by changing load in the voltage value at liquid crystal both ends, to change the space structure of liquid crystal, to change the folding of liquid crystal
Penetrate rate so that the light beam for entering liquid crystal generates the variation of phase, amplitude and polarization state.It is empty according to the polarization state of incident light
Between optical modulator can be operated under amplitude modes, phase pattern and amplitude/phase mixed mode (as shown in Figure 2).Wherein shake
The amplitude of width pattern modulated light wave, the phase of phase pattern modulated light wave, nixed model simultaneously to amplitude and phase into
Row modulation.However mixed type spatial light modulator has therebetween coupled relation, that is, adjusts when being modulated to amplitude and phase
Phase is with change when damping width, and for amplitude also with change, therefore, it is difficult to realize that single spatial light modulator is same when phase modulation
When and independently amplitude and phase are modulated respectively.
Invention content
For the defects in the prior art, the present invention provides a kind of amplitude modulation method of pure phase type spatial light modulator
And device, it can solve to cannot achieve single spatial light modulator in the prior art concurrently and independently to amplitude and phase difference
The problem of being modulated.
In a first aspect, the present invention provides a kind of amplitude modulation method of pure phase type spatial light modulator, the method
Including：
Obtain the quantity N of the spatial light modulator pixeltotal*Mtotal, it is classified as multiple subregions；NtotalIt indicates
The total line number of pixel, MtotalIndicate the total columns of pixel；
The pixel quantity of all subregion is N*M, is multiple 1*2 modulation units by the N*M pixel random division；
The incident light phase of two adjacent pixels in the modulation unit is modulated, is exported by the adjacent pixel
Light interference superposition or interference offset realize modulation unit without phase coupling estimation amplitude modulation while, the spatial light may be used
The original phase modulation pattern of modulator carries out phase-only modulation to input light；
By the amplitude phase inter-modulation between each modulation unit on subregion, to realize the spatial light modulator
On multiple tonal gradations modulation.
Optionally, the spatial light modulator is in the step of realizing phase-only modulation and without phase coupling estimation amplitude modulation
The incident light phase of each pixel is modulated using following formula：
In formula, EijIt indicates to pass through the modulated output light of ith pixel；AmIndicate the amplitude of light to be modulated；ω expressions wait for
The angular frequency of modulation light；Indicate the initial phase of light to be modulated；Indicate the pixel for the required modulation of amplitude modulation
Phase；It is used for the required phase modulation of phase-modulation for the pixel.
Optionally, the spatial light modulator is in the step of realizing without phase coupling estimation amplitude modulation, each picture of modulation unit
Element output light wave, which is taken up an official post, anticipates the vibrational state of any using following formula expression：
In formula, E1And E2Indicate two modulated output lights of adjacent pixel of the modulation unit；AmIndicate light to be modulated
Amplitude；ω indicates the angular frequency of light to be modulated；Indicate the initial phase of light to be modulated；WithIndicate the two of the modulation unit
A adjacent pixel is used for the required phase modulation of amplitude modulation.
Optionally, the spatial light modulator is in the step of realizing without phase coupling estimation amplitude modulation, modulation unit output
Following formula expression is respectively adopted in the conjunction amplitude of light, initial phase, gray value：
In formula, AtotIndicate the conjunction amplitude of the modulation unit output light；Indicate the first of the modulation unit output light
Phase；ItotIndicate the gray value of the modulation unit output light；AmIndicate the amplitude of light to be modulated；ω indicates light to be modulated
Angular frequency；WithIndicate that two adjacent pixels of the modulation unit are used for the required phase modulation of amplitude modulation.
It optionally, can be with when amplitude phase inter-modulation between each modulation unit on the subregion, on the subregion
Realize the control of (N*M)/2+1 tonal gradation.
Second aspect, the embodiment of the present invention additionally provide a kind of amplitude modulation device of pure phase type spatial light modulator,
Described device includes：
Subregion acquisition module, the quantity N for obtaining the spatial light modulator pixeltotal*Mtotal, it is classified as
Multiple subregions；NtotalIndicate the total line number of pixel, MtotalIndicate the total columns of pixel；
Modulation unit acquisition module, for being multiple 1*2 modulation units, the picture of the subregion by subregion random division
Prime number amount is N*M；
Amplitude modulation module is modulated for the incident light phase to two adjacent pixels in the modulation unit,
By the adjacent pixel output light interference superposition or interference offset realize modulation unit without the same of phase coupling estimation amplitude modulation
When, the spatial light modulator original phase modulation pattern may be used, phase-only modulation is carried out to input light；
Gray modulation module, for the amplitude phase inter-modulation between each modulation unit on the subregion, thus
Realize the modulation of multiple tonal gradations in the spatial light modulator.
Optionally, when the amplitude modulation module realizes phase-only modulation and amplitude modulation without phase coupling estimation, use with
Lower expression formula is modulated the incident light phase of each pixel：
In formula, EijIt indicates to pass through the modulated output light of ith pixel；AmIndicate the amplitude of light to be modulated；ω expressions wait for
The angular frequency of modulation light；Indicate the initial phase of light to be modulated；Indicate the pixel for the required modulation of amplitude modulation
Phase；It is used for the required phase modulation of phase-modulation for the pixel.
As shown from the above technical solution, the present invention adjusts the incident light phase of two adjacent pixels in modulation unit
System, be superimposed by the interference of the adjacent pixel output light or interference offset realize modulation unit without phase coupling estimation amplitude modulation
Meanwhile the spatial light modulator original phase modulation pattern may be used, phase-only modulation is carried out to input light.The present invention exists
Other devices need not be added on the basis of existing hardware, and pure phase bit-type spatial light modulator can not only be made to realize pure phase position tune
System and the amplitude modulation without phase coupling estimation, can also realize phase and the mutually independent combined modulation of amplitude.
Description of the drawings
The features and advantages of the present invention can be more clearly understood by reference to attached drawing, attached drawing is schematically without that should manage
Solution is carries out any restrictions to the present invention, in the accompanying drawings：
Fig. 1 (a) is transmissive spatial light modulator fundamental diagram in the prior art；
Fig. 1 (b) is reflective slms fundamental diagram in the prior art；
Fig. 2 is the modulating mode classification schematic diagram of spatial light modulator；
Fig. 3 is a kind of amplitude modulation method flow chart of pure phase type spatial light modulator provided in an embodiment of the present invention；
Fig. 4 is a kind of amplitude modulation device structural frames of pure phase type spatial light modulator provided in an embodiment of the present invention
Figure；
Fig. 5 is the amplitude modulation schematic diagram of transmission phase type spatial light modulator in the embodiment of the present invention；
Fig. 6 is the amplitude modulation schematic diagram of reflected phase type spatial light modulator in the embodiment of the present invention；
Fig. 7 is the projection theory schematic diagram of spatial light modulator provided in an embodiment of the present invention.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
The every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
In a first aspect, as shown in figure 3, the present invention provides a kind of amplitude modulation sides of pure phase type spatial light modulator
Method, the method includes：
S1, the quantity N for obtaining the spatial light modulator pixeltotal*Mtotal, it is classified as multiple subregions；NtotalTable
Show the total line number of pixel, MtotalIndicate the total columns of pixel；
S2, all subregion pixel quantity be N*M, by the N*M pixel random division be multiple 1*2 modulation units；
S3, the incident light phase of two adjacent pixels in the modulation unit is modulated, passes through the adjacent pixel
Output light interference superposition or interference offset realize modulation unit without phase coupling estimation amplitude modulation while, the sky may be used
Between the original phase modulation pattern of optical modulator to input light carry out phase-only modulation；
S4, by the amplitude phase inter-modulation between each modulation unit on subregion, to realize the spatial light tune
The modulation of multiple tonal gradations on device processed.
The present invention is modulated the incident light phase of two adjacent pixels in modulation unit, defeated by the adjacent pixel
Light extraction interference superposition or interference offset realize modulation unit without phase coupling estimation amplitude modulation while, the space may be used
The original phase modulation pattern of optical modulator carries out phase-only modulation to input light.The present invention does not need on the basis of existing hardware
Other devices are added, pure phase bit-type spatial light modulator can not only be made to realize phase-only modulation and the amplitude tune without phase coupling estimation
System, can also realize phase and the mutually independent combined modulation of amplitude.
The amplitude modulation specific method of the output light of 1*2 modulation units is in the embodiment of the present invention：Described two adjacent pictures
Added electric signal need to make the phase difference between each output light after modulation be 0 or π, the light intensity observed whithin a period of time on element
ItotIt is respectively maximumOr 0, i.e., synergistic effect and cancellation effect in interference are two-dimensional encoded to be indicated respectively with 1 and 0；Below
It is with the phase that each pixel is modulatedOrFor illustrate, at this point, by two adjacent pixels
Modulated phase has 22Totally four kinds of situations：With With With WithSuch as
Shown in table 1：
The modulated phase schematic diagram of pixel of the table 1 through 1*2 modulation units
As the effect of the third situation, the modulated output light of two adjacent pixels generates dry wherein the second situation
The cancellation effect related to, total light intensity value are 0；The first situation is as the effect of the 4th kind of situation, two adjacent pixel modulation
Output light afterwards generates the synergistic effect in interference, and total light intensity value is 1.That is the amplitude of 1*2 modulation units is modulated into two kinds of shapes
State is defined as 0 and 1.
It should be noted that in practical applications, the present invention can randomly select four kinds of situations described above as needed
In one kind.
It, can be real on the subregion when amplitude phase inter-modulation between each modulation unit on subregion of the present invention
The control of existing (N*M)/2+1 tonal gradation.It is illustrated below with the amplitude phase inter-modulation between 2 1*2 modulation units.
2 1*2 modulation units may be considered a 2*2 modulation unit, and the phase modulated below with each pixel isOrFor illustrate, at this point, having 2 by four modulated phases of adjacent pixel4Totally ten six
Kind situation：Indicate that modulated phase is with symbol " o "Symbol " x " indicates that modulated phase isThen pass through
There are three kinds of different situations of effect after four adjacent pixel modulation, as shown in table 2：
The modulated phase schematic diagram of pixel of the table 2 through 2 1*2 modulation units
The light intensity I observed whithin a period of timetot1,0.5,0,0.5,1 is corresponded to respectively.I.e. the first situation with the 5th kind
The effect of situation is the same, and the modulated output light of four adjacent pixels generates the synergistic effect in interference, and total light intensity value is 1；The
For two kinds of situations as the effect of the 4th kind of situation, the modulated output light of two of which adjacent pixel generates the superposition in interference
Effect, the modulated output light of other two adjacent pixel generate the cancellation effect in interference, and total light intensity value is 0.5；The third
In the case of, the modulated output light of four adjacent pixels generates the cancellation effect in interference, and total light intensity value is 0.That is 2 1*2 tune
The amplitude of unit processed is modulated into three kinds of states, is defined as 1,0.5,0.
It should be noted that the amplitude of multiple 1*2 modulation units can be modulated into multiple states, i.e., multiple gray scales etc.
Grade, modulator approach is similar to the above-described amplitude modulation method of 2 1*2 modulation units, and this is no longer going to repeat them.
Since the usually more typical value of pixel quantity in practical applications is 512*512,1024*1024 or more, therefore
Modulation accuracy still can guarantee.
Second aspect, the embodiment of the present invention additionally provide a kind of amplitude modulation device of pure phase type spatial light modulator,
As shown in figure 4, described device includes：
Subregion acquisition module, the quantity N for obtaining the spatial light modulator pixeltotal*Mtotal, it is classified as
Multiple subregions；NtotalIndicate the total line number of pixel, MtotalIndicate the total columns of pixel；
Modulation unit acquisition module, for being multiple 1*2 modulation units, the picture of the subregion by subregion random division
Prime number amount is N*M；
Amplitude modulation module is modulated for the incident light phase to two adjacent pixels in the modulation unit,
By the adjacent pixel output light interference superposition or interference offset realize modulation unit without the same of phase coupling estimation amplitude modulation
When, the spatial light modulator original phase modulation pattern may be used, phase-only modulation is carried out to input light；
Gray modulation module, for the amplitude phase inter-modulation between each modulation unit on the subregion, thus
Realize the modulation of multiple tonal gradations in the spatial light modulator.
Optionally, when the amplitude modulation module realizes phase-only modulation and amplitude modulation without phase coupling estimation, use with
Lower expression formula is modulated the incident light phase of each pixel：
In formula, EijIt indicates to pass through the modulated output light of ith pixel；AmIndicate the amplitude of light to be modulated；ω expressions wait for
The angular frequency of modulation light；Indicate the initial phase of light to be modulated；Indicate the pixel for the required modulation of amplitude modulation
Phase；It is used for the required phase modulation of phase-modulation for the pixel.
It should be noted that the present invention can be used to transmission phase type spatial light modulator (as shown in Figure 5), it can also be used to
Reflected phase type spatial light modulator (as shown in Figure 6).
It should be noted that the spatial light modulator that the present invention uses is electrical addressing type phase spatial light modulator, it is logical
It crosses and changes the voltage of pixel electrode load to change the optical characteristics of pixel, to be modulated to the phase of light wave.In reality
As limited by physical space or system principle in system, also spatial light modulator can be used to be modulated light again will be after modulation
Light project to the positions of needs, as shown in fig. 7, f is the focal length of both sides lens, since the pixel of spatial light modulator usually exists
Hundreds of nanometers to some tens of pm magnitude, in order to avoid that due to diffraction image caused by pixel, can add in projection imaging system
Enter diaphragm so that 0 grade of image passes through.The present invention can be allowed by changing the position of diaphragm in optical projection system in addition to 0 order diffraction image
Other order diffraction images pass through such as 1 grade, 2 order diffraction images, can also be not added with diaphragm and all diffraction images are passed through.
It should be noted that since amplitude modulation device provided in an embodiment of the present invention is based on amplitude modulation described above
Method is realized, thus can be solved identical technical problem as method, reaches identical technique effect, no longer superfluous herein
It states.
The present invention proposes a kind of pure phase of use space optical modulator using pure phase type spatial light modulator as hardware foundation
Position modulating mode realizes phase-only modulation, the amplitude modulation without phase coupling estimation, phase and the mutually independent combined modulation of amplitude.
It should be noted that disclosed in the present embodiment in all parts of device, it is right according to the function that it to be realized
Component therein has carried out logical partitioning, and still, the present invention is not only restricted to this, can be carried out again to all parts as needed
It divides or combines, for example, can be single component by some component combinations, or some components can be further broken into
More subassemblies.
The all parts embodiment of the present invention can be with hardware realization, or to run on one or more processors
Software module realize, or realized with combination thereof.It will be understood by those of skill in the art that can use in practice
Microprocessor or digital signal processor (DSP) are come some or all portions in realizing according to the system in the embodiment of the present invention
The some or all functions of part.The present invention is also implemented as the part or complete for executing method as described herein
The equipment or program of device (for example, computer program and computer program product) in portion.Such program for realizing the present invention
It can may be stored on the computer-readable medium, or can be with the form of one or more signal.Such signal can be with
It downloads and obtains from internet website, either provided on carrier signal or provide in any other forms.
It should be noted that the present invention will be described rather than limits the invention for above-described embodiment, and this
Field technology personnel can design alternative embodiment without departing from the scope of the appended claims.In claim
In, any reference mark between bracket should not be configured to limitations on claims.Word "comprising" is not excluded for depositing
In element or step not listed in the claims.Word "a" or "an" before element do not exclude the presence of it is multiple this
The element of sample.The present invention can by means of include several different elements hardware and by means of properly programmed computer come
It realizes.In the unit claims listing several devices, several in these devices can be by the same hardware
It embodies.The use of word first, second, and third does not indicate that any sequence.These words can be construed to
Title.
Embodiment of above is only suitable for illustrating the present invention, and not limitation of the present invention, in relation to the common of technical field
Technical staff can also make a variety of changes and modification without departing from the spirit and scope of the present invention, therefore all
Equivalent technical solution also belongs to scope of the invention, and scope of patent protection of the invention should be defined by the claims.
Claims (7)
1. a kind of amplitude modulation method of pure phase type spatial light modulator, which is characterized in that the method includes：
Obtain the quantity N of the spatial light modulator pixeltotal*Mtotal, it is classified as multiple subregions；NtotalIndicate pixel
Total line number, MtotalIndicate the total columns of pixel；
The pixel quantity of all subregion is N*M, is multiple 1*2 modulation units by the N*M pixel random division；
The incident light phase of two adjacent pixels in the modulation unit is modulated, two adjacent pixel outputs are passed through
Light interference superposition or interference offset realize modulation unit without phase coupling estimation amplitude modulation while, the spatial light may be used
The original phase modulation pattern of modulator carries out phase-only modulation to input light；
By the amplitude phase inter-modulation between each modulation unit on subregion, to realize in the spatial light modulator
The modulation of multiple tonal gradations.
2. amplitude modulation method according to claim 1, which is characterized in that the spatial light modulator is realizing pure phase position
Modulation and the step of without phase coupling estimation amplitude modulation in the incident light phase of each pixel is modulated using following formula：
In formula, EijIt indicates to pass through the modulated output light of ith pixel；AmIndicate the amplitude of light to be modulated；ω indicates to be modulated
The angular frequency of light；Indicate the initial phase of light to be modulated；Indicate the pixel for the required phase modulation of amplitude modulation；It is used for the required phase modulation of phase-modulation for the pixel.
3. amplitude modulation method according to claim 2, which is characterized in that the spatial light modulator is being realized without phase
In the step of coupled amplitude is modulated, each pixel output light wave of modulation unit, which is taken up an official post, anticipates the vibrational state of any using following formula
It indicates：
In formula, E1And E2Indicate two modulated output lights of adjacent pixel of the modulation unit；AmIndicate shaking for light to be modulated
Width；ω indicates the angular frequency of light to be modulated；Indicate the initial phase of light to be modulated；WithIndicate two of the modulation unit
Adjacent pixel is used for the required phase modulation of amplitude modulation.
4. amplitude modulation method according to claim 3, which is characterized in that the spatial light modulator is being realized without phase
In the step of coupled amplitude is modulated, following formula table is respectively adopted in conjunction amplitude, initial phase, the gray value of modulation unit output light
Show：
In formula, AtotIndicate the conjunction amplitude of the modulation unit output light；Indicate the initial phase of the modulation unit output light；
ItotIndicate the gray value of the modulation unit output light；AmIndicate the amplitude of light to be modulated；ω indicates the angular frequency of light to be modulated
Rate；WithIndicate that two adjacent pixels of the modulation unit are used for the required phase modulation of amplitude modulation.
5. amplitude modulation method according to claim 1, which is characterized in that each modulation unit on the subregion it
Between amplitude phase inter-modulation when, the control of (N*M)/2+1 tonal gradation may be implemented on the subregion.
6. a kind of amplitude modulation device of pure phase type spatial light modulator, which is characterized in that described device includes：
Subregion acquisition module, the quantity for obtaining the spatial light modulator pixelIt is classified as multiple sons
Region；NtotalIndicate the total line number of pixel, MtotalIndicate the total columns of pixel；
Modulation unit acquisition module, for being multiple 1*2 modulation units, the pixel number of the subregion by subregion random division
Amount is N*M；
Amplitude modulation module is modulated for the incident light phase to two adjacent pixels in the modulation unit, passes through
Two adjacent pixel output lights interference superposition or interference offset realize modulation unit without the same of phase coupling estimation amplitude modulation
When, the spatial light modulator original phase modulation pattern may be used, phase-only modulation is carried out to input light；
Gray modulation module, for the amplitude phase inter-modulation between each modulation unit on subregion, described in realizing
The modulation of multiple tonal gradations in spatial light modulator.
7. amplitude modulation device according to claim 6, which is characterized in that the amplitude modulation module realizes pure phase position tune
When system and amplitude modulation without phase coupling estimation, the incident light phase of each pixel is modulated using following formula：
In formula, EijIt indicates to pass through the modulated output light of ith pixel；AmIndicate the amplitude of light to be modulated；ω indicates to be modulated
The angular frequency of light；Indicate the initial phase of light to be modulated；Indicate the pixel for the required phase modulation of amplitude modulation；It is used for the required phase modulation of phase-modulation for the pixel.
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| CN109212796A (en) * | 2018-10-24 | 2019-01-15 | 北京航空航天大学 | A kind of negative liquid crystal reflective spatial light modulator |
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| CN101779168A (en) * | 2007-06-13 | 2010-07-14 | 视瑞尔技术公司 | Device for amplitude and phase modulation of light |
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