CN108375859A - A kind of Density Weighted formula complex modulated method of pure phase type spatial light modulator - Google Patents
A kind of Density Weighted formula complex modulated method of pure phase type spatial light modulator Download PDFInfo
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- CN108375859A CN108375859A CN201810240324.0A CN201810240324A CN108375859A CN 108375859 A CN108375859 A CN 108375859A CN 201810240324 A CN201810240324 A CN 201810240324A CN 108375859 A CN108375859 A CN 108375859A
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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
- G02F1/29—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 position or the direction of light beams, i.e. deflection
- G02F1/292—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 position or the direction of light beams, i.e. deflection by controlled diffraction or phased-array beam steering
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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
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The present invention relates to a kind of Density Weighted formula complex modulated methods of pure phase type spatial light modulator.The method includes：S1：The spatial light modulator pixel is divided into multiple subregions, and the pixel in every sub-regions is divided into two groups, includes several pixels in each group；S2：Phased array modulation is carried out to first group of pixel in any subregion, phased array modulation can concentrate the energy of this group of pixel, when the energy of first group of pixel is removed, the energy of elementary beam only remaining second group of pixel after ovennodulation, in every sub-regions the control of first group of pixel energy by realize the Density Weighted formula amplitude modulations of entire pixel planes；S3：Phased array modulation is carried out to second group of pixel in any subregion, second group of pixel of pure phase type spatial light modulator pair can be directly realized by phase-modulation；It can synchronize in this way and independent realization amplitude modulation and phase-modulation.
Description
Technical field
The present invention relates to optical modulation field more particularly to the phase-modulations and amplitude modulation of light.
Background technology
Phase type LCD space light modulator is a kind of device that phase-modulation can be carried out to spatial beam, and being used for will be former
The phase signal of beginning light beam is modulated to required form.Phase type LCD space light modulator includes several multiple independent tune
Unit processed, these units in space be in one-dimensional or two-dimensional array, each unit can independent receiving optical signal or
The control of person's electric signal, and change the optical property of itself according to this signal, these devices can usually change space glazing
The amplitude or phase and polarization state of distribution.
LCD space light modulator was whole in imaging, projection, relevant wavefront modification, optical tweezers, laser pulse in recent years
The reference of the fields such as shape is very extensive.Influence of the spatial light modulator in all kinds of optical systems is very great, and its cost also compared with
It is expensive.Commercial spatial light modulator can realize a form of modulation in amplitude, phase or polarization state at present, and difficult
With synchronous in the same spatial light modulator and independent modulation for realizing amplitude and phase both modalities which.In optical system
In, all particularly significant to the modulation of amplitude and phase, the optical system for needing two kinds of modulation most of at present needs in systems
Phase type LCD space light modulator and amplitude type LCD space light modulator is added simultaneously.And two kinds of modulators are added simultaneously not
Increase only the cost of system and can make system is more complicated, increase system build difficulty.The present invention proposes
A kind of phase and amplitude modulation method based on pure phase type spatial light modulator, this modulator approach are inclined by phased array light beam
Shifting technology will need the part in modulation light beam to be displaced to elsewhere to realize equivalent amplitude modulation, while pass through itself
Phase-modulation ability and realize the synchronization of two kinds of forms and independent modulation.
Invention content
(1) technical problems to be solved
Single spatial light modulator can not be synchronized and is independently modulated to amplitude and phase at present.
(2) technical solution
In order to solve the above technical problem, the present invention provides a kind of Density Weighted formulas of pure phase type spatial light modulator
Complex modulated method, including：
The spatial light modulator be pure phase type spatial light modulator, can directly modulate the phase of light beam and cannot
Enough it is directly realized by the amplitude modulation of light beam.The phase type spatial light modulator includes multiple pixels while being divided into multiple
Subregion.
Include multiple pixels per sub-regions, it includes the numbers of pixel by the grade of its required amplitude modulation
It determines.
Point in every sub-regions is divided into two groups, first group of pixel can be by the group by a kind of linear phase modulation
The energy of pixel is concentrated and the position concentrated is determined by linear phase, former when removing the energy of first group of pixel
The energy of light beam only remaining second group of pixel after ovennodulation, entire pixel is realized by the control to each group of pixel energy
The amplitude modulation of plane, second group of pixel of pure phase type spatial light modulator pair can be directly realized by phase-modulation, that is, pass through this
Amplitude modulation and phase-modulation can be achieved at the same time in kind mode.
One of subregion has M*N pixel, M to indicate that the line number of pixel, N indicate the columns of pixel, the subregion
The ratio that interior first group of number of pixels accounts for total number of pixels is P1, the ratio that second group of number of pixels accounts for total number of pixels is 1-P1,
If the current amplitude of (i, k) unit pixel is Iik, when (i, k) unit pixel is assigned as first group of pixel, energy quilt
It removes, therefore the I of its first group of pixelik=0, that is, only remaining second group of pixel energy, the amplitude of second group of pixel are false after modulating
When being set to 1, first group of pixel electric field table is：
The expression formula of second group of pixel:
E (i, k) indicates to pass through the modulated output light of (i, k) a pixel in formula, and ω is the frequency of light,It is light
Phase,It is the linear modulation phase that first group of pixel is loaded,It is the required phase modulation of light beam.
The linear phaseMeet：
λ is the wavelength of light, θ in formulaiFor the lateral shift angle before and after first group of beam modulation, θkFor first group of light beam tune
The front and back longitudinal off-centre angulation of system.
After modulating in the manner described above, the amplitude of the subregion inner light beam is the (1-P of light beam vibration amplitude before modulating1)×
100%.
(3) advantageous effect
The present invention need not add other devices on the basis of existing pure phase type spatial light modulator, by its middle part
Point pixel removes the energy being radiated in the pixel to reach change equivalent amplitude using phased array beam deviation technology, can be with
Realize phase and the mutually independent combined modulation of amplitude.
Description of the drawings
Fig. 1 is one-dimensional pixel grouping modulation schematic diagram；
Fig. 2 is the sub-zone dividing and equivalent amplitude schematic diagram of two-dimensional array；
Fig. 3 is the light beam deflection principle figure of one-dimensional pixel；
Black pixel point is first group of pixel wherein in figure, and white pixel point is second group of pixel, and d is sky in Fig. 3
Between modulator Pixel Dimensions, λ be light beam wavelength, θ0For light beam deflection angle,It is the initial phase of light,It is
The linear modulation phase that one group of pixel is loaded,It is the required phase modulation of light beam.
Specific implementation mode
With reference to the accompanying drawings and examples, the specific implementation mode of the present invention is described in further detail.Following instance
For illustrating the present invention, but it is not limited to the scope of the present invention.
In the description of the present invention, it is to be understood that, term " longitudinal direction ", " transverse direction ", " length ", " width ", etc. instructions
Orientation or positional relationship be based on the orientation or positional relationship shown in the drawings, be merely for convenience of description the present invention and simplification retouch
It states, does not indicate or imply the indicated device or element must have a particular orientation, with specific azimuth configuration and operation,
Therefore it is not considered as limiting the invention.For the ordinary skill in the art, it can manage as the case may be
Solve the concrete meaning of above-mentioned term in the present invention.
Specific implementation mode one：Illustrate present embodiment in conjunction with Fig. 1 to Fig. 3.Described in present embodiment based on pure phase position
The amplitude modulation of type LCD space light modulator and the synchronous of phase-modulation realize that spatial light modulator can be Reflective spatial
Optical modulator or transmissive spatial optical modulator.
Present embodiment is by taking transmission-type pure phase bit-type LCD space light modulator as an example.
Step 1：The multiple pixels of spatial light modulator, are divided into multiple subregions.
Step 2：Point in every sub-regions is divided into two groups, first group of pixel passes through a kind of linear phase controlled array phase
The energy of this group of pixel can be carried out concentration removal, the energy of elementary beam only remaining second group of pixel after ovennodulation by position modulation
Amount.
Linear phase controlled array phaseMeet：
In formulaIndicate that the linear phase that (i, k) a pixel is configured, i are the abscissa of pixel, k is picture
The ordinate of vegetarian refreshments, λ are the wavelength of light, θiFor the lateral shift angle before and after first group of beam modulation, θkFor first group of light beam tune
The front and back longitudinal off-centre angulation of system.
Step 3：Two groups of pixels, second group of pixel are obtained after being divided to every sub-regions according to step 2
Phase-modulation can be directly realized by by LCD space light modulator, one of subregion has M*N pixel, M to indicate pixel
Line number, N indicates the columns of pixel, and the ratio that first group of number of pixels accounts for total number of pixels in the subregion is P1, second group
The ratio that number of pixels accounts for total number of pixels is 1-P1If the current amplitude of (i, k) unit pixel is Iik, when (i, k) is single
When first pixel is assigned as first group of pixel, energy is moved out of, therefore the I of its first group of pixelik=0, that is, it is only remaining after modulating
Second group of pixel energy, when the amplitude of second group of pixel is assumed to 1, first group of pixel electric field table is：
The expression formula of second group of pixel:
E (i, k) indicates to pass through the modulated output light of (i, k) a pixel in formula, and ω is the frequency of light,It is light
Phase,It is the linear modulation phase that first group of pixel is loaded,It is that the required phase modulation of light beam namely load exist
Phase modulation on second group of pixel.
After modulating in the manner described above, the amplitude of the subregion inner light beam is the (1-P of light beam vibration amplitude before modulating1)×
100%；Before and after the phase-modulation of subregion inner light beam, the change of phase
In above-mentioned step one, subregion can be divided according to amplitude modulation grade, and n are included in a sub-regions
When pixel, which may be implementedGrade amplitude modulation.As shown in Fig. 2, four sub-districts
Domain includes 4 pixels, and pixel is that black indicates that it is first group of pixel, and pixel is that white indicates that it is second group
Pixel, it includes 4 white pixel points that subregion 1 is interior namely its equivalent amplitude is 1.Subregion 2 includes 2 black pixel points
It is with 2 white pixel points namely its equivalent amplitudeSubregion 3 includes 1 black pixel point and 3 white pixel points
I.e. its equivalent amplitude isSubregion 4 includes 4 black pixel points namely its equivalent amplitude is 0.
In above-mentioned step two, as shown in Figure 1, after the light beam of a region inside points pixel deflects, adjust
Gross energy can be reduced accordingly after system.The one-dimensional schematic diagram of beam deflection techniques by a kind of linear phase as shown in figure 3, configured
Light beam deflects with elementary beam after can making the modulation of first group of pixel, the angle, θ of light beam deflection0Between practical adjacent pixel
Away from d correlations, spatial light modulator is a two dimensional surface device, and pixel is evenly distributed on two dimensional surface, it is therefore desirable to right
A kind of two-dimensional linear phase configuration is arranged in first group of pixel.
Realize that the amplitude modulation of entire pixel planes, pure phase bit-type are empty by the control to every sub-regions pixel energy
Between second group of pixel of optical modulator pair can be directly realized by phase-modulation, i.e., can synchronize in this way and it is independent realization shake
Width is modulated and phase-modulation.
Claims (4)
1. a kind of Density Weighted formula complex modulated method of pure phase type spatial light modulator, which is characterized in that the method
It is to be based on pure phase type spatial light modulator, method is divided into following three step：
S1：The spatial light modulator pixel is divided into multiple subregions, and the pixel in every sub-regions is divided into two groups, each group
Including several pixels；
S2：Phased array modulation is carried out to first group of pixel in any subregion, phased array modulation can be by this group of pixel
Energy is concentrated, when the energy of first group of pixel is removed, the energy of elementary beam only remaining second group of pixel after ovennodulation
Amount, in every sub-regions the control of first group of pixel energy by realize the Density Weighted formula amplitudes of entire pixel planes
Modulation；
S3：Phased array modulation, pure phase type spatial light modulator pair second are carried out to second group of pixel in any subregion
Group pixel can be directly realized by phase-modulation；
Equivalent amplitude modulation can be realized by controlling the ratio of first group of pixel per sub-regions, by controlling second group
The phase modulation of pixel can realize phase-modulation, can synchronize in this way and independent realization amplitude modulation and phase
Modulation.
2. a kind of Density Weighted formula complex modulated method of pure phase type spatial light modulator according to claim 1,
It is characterized in that, the ratio that first group of number of pixels accounts for total number of pixels in any one described subregion is P1, second group of pixel
The ratio that number accounts for total number of pixels is 1-P1If the current amplitude of (i, k) unit pixel is Iik, when (i, k) unit picture
When element is assigned as first group of pixel, energy is moved out of, therefore the I of its first group of pixelik=0, that is, only remaining second after modulating
Group pixel energy, when the amplitude of second group of pixel is assumed to 1, first group of pixel electric field is：
The expression formula of second group of pixel:
E (i, k) indicates to pass through the modulated output light of (i, k) a pixel in formula, includes N*M pixel in subregion,
ω is the frequency of light,It is the phase of light,It is the linear phase controlled array phase modulation that first group of pixel is loaded,It is light
The required phase modulation of beam.
3. a kind of Density Weighted formula complex modulated method of pure phase type spatial light modulator according to claim 2,
It is characterized in that, the linear phase phased arrayMeet：
λ is the wavelength of light, θ in formulaiFor the lateral shift angle before and after first group of beam modulation, θkBefore first group of beam modulation
Longitudinal off-centre angulation afterwards.
4. a kind of Density Weighted formula complex modulated method of pure phase type spatial light modulator according to claim 2,
It is characterized in that, the energy that second group of pixel includes is the gross energy of light beam after modulating, that is, the amplitude of light beam is modulation after modulating
(the 1-P of light beam vibration amplitude before1) × 100%.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115268061A (en) * | 2022-09-28 | 2022-11-01 | 中国科学技术大学 | Digital micro-reflector pure phase modulation implementation method and imaging method |
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