CN107796594B - A kind of Atmosphere Turbulence Simulator based on spatial light modulator - Google Patents
A kind of Atmosphere Turbulence Simulator based on spatial light modulator Download PDFInfo
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- CN107796594B CN107796594B CN201710735764.9A CN201710735764A CN107796594B CN 107796594 B CN107796594 B CN 107796594B CN 201710735764 A CN201710735764 A CN 201710735764A CN 107796594 B CN107796594 B CN 107796594B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
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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
- G02F1/1313—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 specially adapted for a particular application
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Abstract
The invention discloses a kind of Atmosphere Turbulence Simulators based on spatial light modulator, including laser, the first spatial light modulator, second space optical modulator, the third spatial light modulator, CCD camera sequentially coaxially collinearly arranged, the write-in light that laser generates is modulated through the first spatial light modulator generates complicated light beam, which passes sequentially through second space optical modulator, the atmospheric turbulance of third spatial light modulator simulation is received by CCD camera.The present invention is based on the Atmosphere Turbulence Simulators of spatial light modulator to have robustness, and the variation that atmospheric conditions not only may be implemented can also realize the variation of propagation distance, to keep system and device flexible and practical.
Description
Technical field
The present invention relates to atmospheric optics fields, in particular to a kind of overfall simulator based on spatial light modulator.
Background technique
Atmospheric turbulance is a kind of non-homogeneous Disordered Media, with being constantly progressive for science and technology, atmospheric optics and optic communication
Technical field also achieves rapid progress.When light transmits in atmospheric turbulance, variations in refractive index caused by turbulent flow leads to light beam
Transmission quality decays, to cause to drift about, extends, and a series of variations such as flashing constrain the development of atmospheric optical communication, because
This, it is necessary to be unfolded targetedly to study, further analyzes atmospheric turbulance to Opto-electrical Section for transmission of the laser in atmospheric turbulance
The influence factor of system.
It working for the studies above, a kind of approach having been contemplated that at present is progress field experiment, but due to atmosphere light
Special situation is learned, field experiment is not only time-consuming and laborious, but also the cost of field experiment is very high, it is most important that field experiment
Experiment condition be difficult to duplicate acknowledgment, it is also very big that experimental data acquires difficulty, therefore the method for field experiment is not extensive
Using.Another method is using gas or liquid come simulated atmosphere turbulent flow.Its principle is right using gas or liquid itself
The disadvantages of stream carrys out simulated atmosphere turbulent flow, and principle is simple, but has heat dissipation difficult, and intensity is difficult to control, less reproducible；Also
A kind of method is the phase screen based on micro-processing technology come simulated atmosphere turbulent flow, and principle is that the phase distortion etching of turbulent flow exists
On glass substrate, then by rotatable phase screen come simulated atmosphere turbulent flow, the disadvantage is that phase change is fixed, rotation wave face has
Periodically, this has biggish gap with actual conditions.
In addition, recently as the development of liquid crystal technology, also it has been proposed that carrying out atmosphere using the electro-optical characteristic of liquid crystal
The simulation of turbulent flow generally changes the refractive index of liquid crystal by changing voltage.Due to LCD space light modulator have it is at low cost,
It is dynamically modulated, may be programmed driving the advantages that, it may become technology trends in overfall simulator future this.Both at home and abroad
Have more mechanisms and all expand the research work of this respect, and achieve certain achievement, successfully utilizes liquid crystal spatial light tune
Device processed simulates atmospheric turbulance.But wherein most has used single spatial light modulator to simulate light beam in the presence of turbulent flow
It propagates, the disadvantage is that device is difficult to be adjusted flexibly, practicability the case where for different atmospheric conditions and propagation distance beam propagation
It is poor.
Summary of the invention
The invention proposes a kind of Atmosphere Turbulence Simulators based on spatial light modulator.
Realize technical solution of the invention are as follows: a kind of Atmosphere Turbulence Simulator based on spatial light modulator, including
The laser that sequentially coaxially collinearly arranges, the first spatial light modulator, second space optical modulator, third spatial light modulator,
CCD camera, in which:
The laser is for generating write-in light；
First spatial light modulator is loaded into beam phase figure and the first focal length by the drive module in computer
f0；
The second space optical modulator is loaded into first phase screen and the second focal length by the drive module in computer
f1；
The third spatial light modulator is loaded into second phase screen and third focal length by the drive module in computer
f2；
The CCD camera is used to receive the complicated light of third spatial light modulator sending；
The write-in light that laser generates is modulated through the first spatial light modulator generates complicated light beam, which passes sequentially through
The atmospheric turbulance that second space optical modulator, third spatial light modulator are simulated is received by CCD camera.
Compared with prior art, the present invention its remarkable advantage are as follows: the present invention is simulated with two spaces optical modulator,
The position of spatial light modulator and digital camera can immobilize, and programmably, atmospheric conditions not only may be implemented
Variation, can also realize the variation of beam propagation passage length, to keep system and device flexible and practical.
Further detailed description is done to the present invention with reference to the accompanying drawing.
Detailed description of the invention
Fig. 1 is that the present invention is based on the discrete models that the overfall simulator of spatial light modulator wants simulated atmosphere channel.
Fig. 2 is the structural schematic diagram of the overfall simulator device the present invention is based on spatial light modulator.
Specific embodiment
A kind of Atmosphere Turbulence Simulator based on spatial light modulator, including sequentially coaxially collinearly arrange laser,
One spatial light modulator, second space optical modulator, third spatial light modulator, CCD camera, in which:
The laser is for generating write-in light；
First spatial light modulator is loaded into beam phase figure and the first focal length by the drive module in computer
f0；
The second space optical modulator is loaded into first phase screen and the second focal length by the drive module in computer
f1；
The third spatial light modulator is loaded into second phase screen and third focal length by the drive module in computer
f2；
The CCD camera is used to receive the complicated light of third spatial light modulator sending；
The write-in light that laser generates is modulated through the first spatial light modulator generates complicated light beam, which passes sequentially through
The atmospheric turbulance that second space optical modulator, third spatial light modulator are simulated is received by CCD camera.
Preferably, laser is the semiconductor laser that wavelength is 532nm.
In further embodiment, the first focal length f0, the second focal length f1, third focal length f2Meet:
f0=z'1α0/(α0-α1)
f1=z'1z'2α1/[z'1(α1-α2)+z'2(α1-α0)]
f2=z'2z'3α2/[z'2(α2-α3)+z'3(α2-α1)]
In formula, α0Indicate the beam radius and input beam radius ratio, α in discrete Atmospheric models that laser generates1=z'1/
(α0z1),α2=z1z'2α0/(z'1z2),α3=z'1z2z'3/(α0z1z'2z3), z'1Indicate second space optical modulator to the first sky
Between optical modulator distance, z'2Indicate distance of the third spatial light modulator to second space optical modulator, z'3Indicate that CCD takes the photograph
As head to the distance of third spatial light modulator, z1、z2、z3First phase screen is respectively indicated in discrete Atmospheric models to swashing
The distance of the distance of light device, second phase screen to first phase screen, CCD camera to second phase screen away from
From.
In further embodiment, the distance z' of third spatial light modulator to second space optical modulator2It is taken the photograph with CCD
As the distance z' of head to third spatial light modulator3Meet: z'3< 0.4845L'< z'2+z'3, in formula, L' indicates laser
To the distance of CCD camera.
In further embodiment, the distance z' of second space optical modulator to the first spatial light modulator1, third space
Distance z' of the optical modulator to second space optical modulator2With CCD camera to third spatial light modulator distance z'3Meet:
z'3z'1/z1=z'2/z2=z'3/z3=L'/L=γ.
Phase screen distribution is calculated by computer turbulence software, and is loaded onto spatial light modulator by drive module,
Spatial light modulator is passed through with laser incidence write-in light, spatial light modulator realizes dynamic regulation liquid crystal molecule by electric signal
It arranges and phase information is written, to achieve the purpose that simulated atmosphere turbulent flow.
It is that the present invention is based on the overfall simulator of spatial light modulator institute actual environments to be simulated to establish in conjunction with Fig. 1, Fig. 1
Atmospheric channel discrete model, the discrete model with Freed parameter r0Corresponding constant parameter structureWhat is be characterized is weak
It is established in Turbulence Media, the discrete model optical communication path length established is L, a length of λ of light wave, distance input plane L1And L2
The first random phase screen PS is placed respectively in place1With the second random phase screen PS2。
r0Also referred to as atmospheric coherence length has plane waveWherein k=2 π/λ.According to
Lei Tuofu varianceValue atmospheric turbulance is divided into strong or weak, weak turbulence state corresponds toLess than 1.
First random phase screen PS1With the second random phase screen PS2Freed parameter be respectively r01、r02And it is full
Foot:
Input plane and random phase screen PS1The distance between be denoted as z1, random phase screen PS1And random phase screen
Curtain PS2The distance between be denoted as z2, random phase screen PS2The distance between receiving plane CCD is denoted as z3, wherein z1+z2+z3=
L, thus, the first random phase screen PS1With the second random phase screen PS2Freed parameter respectively indicate are as follows:
Due to parameter r01And r02It must be positive, so phase screen position is restricted to:
z3< 0.4845L < z2+z3
In the case where two phase screens Freed parameter having the same, z2、z3It needs to meet:
As shown in connection with fig. 2, the present invention is based on the Atmosphere Turbulence Simulator of spatial light modulator to discrete Atmospheric models from
By space interval zi, light beam and screen parameter carry out scaling appropriate.It, can be in free space interval z by scalingiIn
Beam propagation is equivalent to one in free space interval z'iSimulator in beam propagation.The simulator needs to be embedded in two
Spherical lens, and spatial light modulator has the function of to change focal length, can play the role of said lens, therefore by lens and phase
Screen is addressed in spatial light modulator together, thus constructs the Atmosphere Turbulence Simulator the present invention is based on spatial light modulator, and
The focal length that the distance of each free space interval and needs are loaded into simulator needs to meet:
In formula, fiIndicate corresponding spatial light modulator focal length to be loaded, αiIndicate abscissa zoom factor, and α0
=W'/W, W' indicate the input beam radius of simulator, and W indicates the input velocity of light radius of discrete Atmospheric models, by above-mentioned matrix
Following constraint condition can be exported:
z'i=ziαi-1αi=fi-1+fi
Wherein i=1,2,3, such as can be released when i=1 by above formula:
f0=z'1α0/(α0-α1),α1=z'1/(α0z1),
In three free space interval z associated with simulator1,z2,z3In repeat above-mentioned derivation process in turn, in mould
In quasi- device, the output scaling in each stage is equal to the input in next stage and scales, and thus we can continue to release:
f1=z'1z'2α1/[z'1(α1-α2)+z'2(α1-α0)],
f2=z'2z'3α2/[z'2(α2-α3)+z'3(α2-α1)]
α2=z1z'2α0/(z'1z2),
α3=z'1z2z'3/(α0z1z'2z3),
In the present invention, z'1Actually indicate distance of the second space optical modulator to the first spatial light modulator, z'2
Indicate distance of the third spatial light modulator to second space optical modulator, z'3Indicate CCD camera to the light modulation of third space
The distance of device, z1、z2、z3Respectively indicate distance, second phase of first phase screen to laser in discrete Atmospheric models
Distance of the screen to first phase screen, distance of the CCD camera to second phase screen.
Z' can be chosen in the present invention1/z1=z'2/z2=z'3/z3=L'/L=γ, then constraint equation abbreviation are as follows: z'1
< 1.06z'2, at this time by γ=αiαi+1It can obtain, α0=α2, α1=α3=γ/α0, so as to obtain the focal length value of abbreviation:
Because L value is fixed, L' value can unrestricted choice, so, we can choose the z of the condition of satisfactioniValue, so that it is determined that mould
Spacing and each spatial light modulator institute focal length to be loaded between quasi- device spatial light modulator.Note that second space light tune
Device processed needs the symbol of focal length to be loaded always to need coke to be loaded with the first spatial light modulator and third spatial light modulator
Away from symbol on the contrary, thus we can simulate the atmospheric turbulance condition of different distance.
Overfall simulator system proposed by the present invention is quick and programmable for turbulent-flow conditions and beam propagation distance
Variation is all applicable, but in fact, its performance will receive the spatial resolution of spatial light modulator and the limit of time response
System.In actual operation, phase screen appropriate installation and beam intensity are measured, zooming parameter αiIt cannot differ each other too
It is more.For example, for following parameter W0=0.05m, W'0=10-3M and L'=1.5m, the beam propagation distance interval limitation of permission
For L ∈ [1875,7500] m.On the other hand, in order to realize the focusing of spatial light modulator, correspond to wave-front phase modulation π
r2/ λ f, maximum spatial frequency D/4 λ f have to be larger than 1/2p, and wherein p is the pel spacing of SLM.Therefore, the modulus of focal length is limited
In | f | > Dp/2 λ.Representative value: p=10 μm, D=10 μm, l=0.5 μm may be implemented digital lens | f | > 10cm.
So that a kind of Atmosphere Turbulence Simulator based on spatial light modulator disclosed by the invention can be in different turbulent flows
Condition and propagation distance Imitating beam propagation have robustness, and spatial light modulator and digital camera can immobilize, with can
The mode of programming, the variation that atmospheric conditions not only may be implemented can also realize the variation of propagation distance, to make system and device
It is flexible and practical.
It is described in more detail below with reference to embodiment.
Embodiment 1
The Atmosphere Turbulence Simulator created in the present embodiment includes two synchronous spatial light modulators, i.e. second space light tune
Device SLM processed1With third spatial light modulator SLM2, all it is 19 μm of pixel size of Holoeye LCR2500, for encoding phase
Position screen and corresponding focal length, are shown in Fig. 2.In the present embodiment, we have actually used a first spatial light modulator SLM0, it
Generation input signal can be may be programmed, such as gaussian sum is vortexed light beam.First spatial light modulator SLM0Positioned at the input of system
At laser in plane, the phase information for inputting light beam is addressed to the first spatial light modulator together with corresponding focal length
SLM0In.Parallel coherent laser beam (wavelength X=532nm is worked with the output power of 30mW) is incident on the first spatial light tune
Device SLM processed0, it is emitted complicated light beam.In Atmosphere Turbulence Simulator, the phase screen of load is in second space optical modulator SLM1With
Third spatial light modulator SLM2Display in the rectangular area (size is 1920 × 1080 pixels) at display screen center, Wo Men
The distance between overfall simulator each section selected in experiment is z'1=0.50m, z'2=0.57m, z'3=0.5m, such as Fig. 2
It is shown.Positioned at receiver plane CCD camera (12 gray scales, Pixel Dimensions be 4.36 μm and 1280 × 1024 pixels) and
Second space optical modulator SLM1With third spatial light modulator SLM2It is synchronous, convenient for acquisition image.
The programmable setting of the one proposed by the present invention experiment based on two spaces optical modulator SLM, can be used for simulating
Light beam is propagated in weak turbulent flow under different distance and atmospheric parameter.We are pressing above content with Gaussian beam and vortex beams
The experiment that light distribution and light intensity flashing have been done in the system built, and compare with theoretical value, it was demonstrated that its correctness.
Claims (4)
1. a kind of Atmosphere Turbulence Simulator based on spatial light modulator, which is characterized in that including what is sequentially coaxially collinearly arranged
Laser, the first spatial light modulator, second space optical modulator, third spatial light modulator, CCD camera, in which:
The laser is for generating write-in light；
First spatial light modulator is loaded into beam phase figure and the first focal length f by the drive module in computer0；
The second space optical modulator is loaded into first phase screen and the second focal length f by the drive module in computer1；
The third spatial light modulator is loaded into second phase screen and third focal length f by the drive module in computer2；
The CCD camera is used to receive the complicated light of third spatial light modulator sending；
The write-in light that laser generates is modulated through the first spatial light modulator generates complicated light beam, which passes sequentially through second
The atmospheric turbulance that spatial light modulator, third spatial light modulator are simulated is received by CCD camera；
The first focal length f0, the second focal length f1, third focal length f2Meet:
f0=z '1α0/(α0-α1)
f1=z '1z′2α1/[z′1(α1-α2)+z′2(α1-α0)]
f2=z '2z′3α2/[z′2(α2-α3)+z′3(α2-α1)]
In formula, α0Indicate the beam radius and input beam radius ratio, α in discrete Atmospheric models that laser generates1=z '1/(α0z1),α2=z1z′2α0/(z′1z2),α3=z '1z2z′3/(α0z1z′2z3), z '1Indicate second space optical modulator to the first space
The distance of optical modulator, z '2Indicate distance of the third spatial light modulator to second space optical modulator, z '3Indicate CCD camera shooting
Head arrives the distance of third spatial light modulator, z1、z2、z3First phase screen is respectively indicated in discrete Atmospheric models to laser
The distance of the distance of device, second phase screen to first phase screen, CCD camera to second phase screen away from
From.
2. the Atmosphere Turbulence Simulator according to claim 1 based on spatial light modulator, which is characterized in that the laser
Device is the semiconductor laser that wavelength is 532nm.
3. the Atmosphere Turbulence Simulator according to claim 1 based on spatial light modulator, which is characterized in that third space
Distance z ' of the optical modulator to second space optical modulator2With CCD camera to third spatial light modulator distance z '3Meet:
z3' < 0.4845L'< z2'+z3', in formula, L' indicates laser to the distance of CCD camera.
4. the Atmosphere Turbulence Simulator according to claim 1 or 3 based on spatial light modulator, which is characterized in that second
Distance z ' of the spatial light modulator to the first spatial light modulator1, third spatial light modulator to second space optical modulator
Distance z '2With CCD camera to third spatial light modulator distance z '3Meet: z '1/z1=z '2/z2=z '3/z3=L'/L=
γ。
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| CN102183354A (en) * | 2011-02-25 | 2011-09-14 | 中国科学院上海光学精密机械研究所 | Turbulence simulation device based on optical addressing liquid crystal spatial light modulator |
| CN105092056A (en) * | 2015-05-19 | 2015-11-25 | 中国科学院上海光学精密机械研究所 | Digital phase shift point diffraction interferometer and optical system wave aberration measuring method |
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| US9104027B2 (en) * | 2012-04-27 | 2015-08-11 | Manufacturing Techniques, Inc. | Optical instrument for the simulation of atmospheric turbulence |
| CN103605860B (en) * | 2013-11-28 | 2016-06-22 | 中国科学院软件研究所 | A kind of imperfect light source analogy method based on equivalent phase screen method |
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| CN102183354A (en) * | 2011-02-25 | 2011-09-14 | 中国科学院上海光学精密机械研究所 | Turbulence simulation device based on optical addressing liquid crystal spatial light modulator |
| CN105092056A (en) * | 2015-05-19 | 2015-11-25 | 中国科学院上海光学精密机械研究所 | Digital phase shift point diffraction interferometer and optical system wave aberration measuring method |
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