CN107422489A - A kind of device and method of dynamic control speckle field contrast - Google Patents
A kind of device and method of dynamic control speckle field contrast Download PDFInfo
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- CN107422489A CN107422489A CN201710580826.3A CN201710580826A CN107422489A CN 107422489 A CN107422489 A CN 107422489A CN 201710580826 A CN201710580826 A CN 201710580826A CN 107422489 A CN107422489 A CN 107422489A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000005259 measurement Methods 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 claims description 3
- 238000012545 processing Methods 0.000 abstract description 2
- 238000010587 phase diagram Methods 0.000 description 7
- 230000033228 biological regulation Effects 0.000 description 3
- 230000033001 locomotion Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 101100459910 Arabidopsis thaliana NCS1 gene Proteins 0.000 description 1
- 239000004606 Fillers/Extenders Substances 0.000 description 1
- 241001323321 Pluto Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/48—Laser speckle optics
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- Optics & Photonics (AREA)
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Abstract
The present invention relates to speckle field light intensity control technique, discloses a kind of device and method of dynamic control speckle field contrast, and method includes：The light beam of laser output incides polarizer, is again incident in spatial light modulator after two the beams extended by lens；The random phase animation of phase place change amplitude-controllable is loaded in spatial light modulator；Incident beam is after spatial light modulator reflection, focused on by the first large-numerical aperture object lens, scattering medium is placed on the near focal point of the first object lens, is collected again by the second object lens by the emergent light of scattering medium, speckle field is produced, finally gathers speckle field light intensity using laser beam analyzer.The present invention directly controls speckle field contrast by the phase place change amplitude of random phase animation, scientific in principle, easily realizes；Apparatus structure is simple, is easy to adjust, and stability is good；The method of dynamic control speckle field contrast provided by the invention, the fields such as Laser Processing and laser display can be applied to.
Description
Technical field
The present invention relates to the light intensity control technique of speckle field, and in particular to a kind of method of dynamic control speckle field contrast
And its device, can easily and efficiently control light beam to form the contrast of speckle field by scattering medium, applied to laser plus
The fields such as work, laser display.
Background technology
In some applications of laser, laser can be related to by scattering medium (such as blank sheet of paper, biological tissue, nanometer material
Material etc.) transmission problem.Laser beam is incided on scattering medium, randomness and refraction due to scattering medium Particle Distribution
The reasons such as the inhomogeneities of rate distribution, light will undergo complicated multiple scattering event in scattering medium, relevant which results in height
The laser beam of degree can form the speckle field of light intensity disorder distribution after scattering medium transmits.This speckle field is for laser
Some applications be unfavorable.Such as in laser display, the speckle phenomena on screen can have a strong impact on image quality, reduce
The resolution ratio and definition of image.Speckle contrast is that it is defined as describing one of the most frequently used parameter of speckle field property
Wherein ImaxRepresent the largest light intensity value in speckle field, IminRepresent the minimum light intensity values in speckle field.It is it will be apparent that right
Lower than degree to mean speckle phenomena more unobvious, light distribution is more uniform.
Conventional suppression speckle phenomena, the method for reducing speckle contrast, mainly including following several：1. add machinery fortune
Dynamic element, such as scattering object of motion or the screen of vibration, it is to need the defects of this method to add in the optical path at a high speed
The element of motion, the stability of system can be reduced.2. by the use of colloidal solution as the scattering unit of movement, the drawbacks of this method
It is to be difficult to the contrast for quantitatively controlling speckle.It is 3. relatively complicated using the superposition of multiple beam, the light path of this method.
4. increasing the width of spectrum, requirement of this method to light source is higher.
To sum up analyze, although having had been developed that many methods for being used to control speckle contrast.But currently used for control
The method of speckle field contrast processed, it is existing particularly in terms of the dynamic control of speckle field contrast in place of having some shortcomings
Method, it is difficult to realize the real-time dynamic control of speckle field contrast.
The content of the invention
It is an object of the invention to overcome the deficiency of prior art, there is provided a kind of device of dynamic control speckle field contrast
And method, device provided by the present invention can direct dynamic control speckle field contrast, it is simple to operate, generate on computers
The random phase animation of phase place change amplitude-controllable, and be loaded into spatial light modulator, light beam is by space light modulation
Device carries out phase-modulation, so that it may realizes the dynamic regulation to speckle field contrast.The speckle field that technical solution of the present invention is proposed
The dynamic control method of contrast, there is important application value in laser display, Laser Processing etc..
The technical solution adopted for the present invention to solve the technical problems is：
A kind of device of dynamic control speckle field contrast, includes successively：Laser, the first lens, the second lens, polarization
Piece, spatial light modulator, the first computer, the first object lens, scattering medium, the second object lens；The laser warp that the laser is sent
First lens and the second lens incide the polarizer after being expanded；Linearly polarized light beam caused by the polarizer enters
It is mapped to the spatial light modulator；The phase of the spatial light modulator is by the first computer phase control, first meter
The random phase animation of the phase place change amplitude-controllable of calculation machine generation, the light beam of phase-modulation enter after first object lens focusing
It is mapped on described scattering medium, is collected by the emergent light of scattering medium by the second described object lens.
Described device also includes：
Laser beam analyzer and second computer；The second computer is connected with the laser beam analyzer；The light beam
Analyzer is used to gather the speckle field light intensity that light beam is formed by scattering medium, and carries out speckle field by the second computer
The measurement of contrast.
A kind of method of dynamic control speckle field contrast, is comprised the following steps that：
Laser beam is sent after the first lens and the second lens are expanded by laser, then polarization is produced through polarizer
Spatial light modulator is incided after light；
The random phase animation of phase place change amplitude-controllable caused by the first computer is loaded in spatial light modulator；
The reflected light of spatial light modulator focuses on through the first object lens, incides on scattering medium；Second object lens collect scattering
The emergent light of medium, and produce speckle field in its exit end；
Spatial light modulator carries out the phase-modulation of different amplitudes of variation, obtains the speckle field of contrast controllable variations.
Methods described also includes：
The laser beam analyzer gathers the speckle field light intensity of second objective lens exit, and by with the laser beam analyzer phase
The contrast of second computer measurement speckle field even.
The principle of the present invention is the phase place change amplitude by controlling random phase in spatial light modulator, overcomes existing skill
Art can not realize the dynamic control of speckle field contrast.Utilization space optical modulator loads random phase and carries out phase to laser beam
Position regulation and control, it will change, dissipate by the light distribution of speckle field produced by scattering medium by the laser beam of phase-modulation
The contrast of spot field is determined that phase place change amplitude is bigger by the amplitude of variation of loading random phase, then speckle field contrast is got over
It is low.According to this principle, the controllable random phase of amplitude of variation in space light modulation loading, it is possible to realize that speckle field contrasts
The control of degree.
Compared with prior art, the beneficial effects of the invention are as follows：
A kind of apparatus structure of dynamic control speckle field contrast of the present invention is simple, is easy to adjust；Meter can directly be utilized
Calculation machine controls the amplitude of variation of spatial light modulator random phase, realizes the dynamic control to speckle field contrast, and method is simple,
Reliably；The inventive method can apply to the contrast regulation and control of all kinds speckle field, and usage range is wide.
The present invention is described in further detail below in conjunction with drawings and Examples, but a kind of dynamic control of the present invention dissipates
The device and method of spot field contrast is not limited to embodiment.
Brief description of the drawings
Fig. 1 is a kind of structural representation of dynamic control speckle field contrast device provided in an embodiment of the present invention；
Fig. 2 is the speckle pattern that contrast is 0.78 in the embodiment of the present invention；
Fig. 3 is the speckle pattern that contrast is 0.69 in the embodiment of the present invention；
Fig. 4 is the speckle pattern that contrast is 0.50 in the embodiment of the present invention.
Reference：1st, laser, the 2, first lens, the 3, second lens, 4, polarizer, 5, spatial light modulator, 6,
One computer, the 7, first object lens, 8, scattering medium, the 9, second object lens, 10, laser beam analyzer, 11, second computer.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is done furtherly
It is bright.Obviously, described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.Based on the present invention
In embodiment, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example, belongs to the scope of protection of the invention.
A kind of structural representation for dynamic control speckle field contrast device that the present embodiment provides, its concrete structure show
It is intended to referring to shown in accompanying drawing 1；The device includes laser 1, the first lens 2, the second lens 3, polarizer 4, spatial light and adjusted successively
Device 5 processed, the first computer 6, the first object lens 7, scattering medium 8, the second object lens 9, the laser beam analyzer for controlling spatial light modulator
10th, the second computer 11 for measurement.
A kind of method for dynamic control speckle field contrast that the present embodiment provides, is comprised the following steps that：
Step 1, laser 1 is opened, laser beam is after the first lens 2 and the collimator and extender of the second lens 3, then warp
Polarizer 4 produces linearly polarized light；
Step 2, linearly polarized light incides phase type spatial light modulator 5, is adjusted by the spatial light for being loaded with random phase
Device processed；The random phase animation of phase place change amplitude-controllable is produced using computer 6, and is loaded into phase type spatial light tune
Device processed, realize the control to laser beam phase place change amplitude.
Step 3, the reflected light of spatial light modulator is via the first object lens 7, the object lens 9 of scattering medium 8 and second, in the second thing
The exit end of mirror 9 forms speckle field.
Step 4, the speckle field light intensity of the second object lens 9 outgoing, is counted via laser beam analyzer 10 and coupled second
The composition measuring apparatus of calculation machine 9, for measuring the contrast of speckle field.
Laser 1 in the present embodiment is He-Ne laser, power output 15mW, wavelength 633nm；First lens 2
Focal length f=10mm, the focal length f=30mm of the second lens 3.Laser beam after expanding passes through polarizer 4, obtains linearly polarized light
Beam.
Linearly polarized light incides spatial light modulator 5, and the spatial light modulator 5 is reflective phase type spatial light modulator
(German HOLOEYE, PLUTO), dynamic random phase is loaded thereon and is controlled by the first computer 6.Produced using the first computer 6
The random phase animation of phase place change amplitude-controllable.
Random phase animation principle on first computer 6 is the phase that spatial stochastically distribution is generated using random function.
Introduce the amplitude of variation size that parameter c represents random phase.The excursion of random phase depends on parameter c, is specially random
The phase place change amplitude of phase is between π-c π to π+c π.Such as amplitude of variation c=0.2, then each point in phase diagram
Phase is 0.8 π to a 1.2 π any number, is random value for different spaces point its phase in phase diagram, because
Random disorder distribution is spatially presented in this phase diagram.For the phase diagram of same phase place change amplitude, we utilize software
Produce hundreds of phase diagrams.Due to the randomness of function, the phase distribution of this hundreds of phase diagrams is different.By this hundreds of
Phase diagram, using software development into an animation.The animation is loaded into spatial light modulator, it is possible to realize to light beam
Phase-modulation.After spatial light modulator reflects, the phase of laser is all shown as at random laser beam on room and time
Disorder distribution.In order to realize the dynamic control to speckle field contrast, phase has all been made for the phase of different amplitudes of variation
The animation answered.The animation of different amplitudes of variation is loaded into spatial light modulator, can dynamically be controlled through space light modulation
The phase place change amplitude of the laser beam of device reflection.It is corresponding, it is illustrated in figure 2 the contrast gone out according to present principles dynamic modulation
For the 0.78 speckle field surface of intensity distribution；It is illustrated in figure 3 the speckle that the contrast gone out according to present principles dynamic modulation is 0.69
The field surface of intensity distribution；It is illustrated in figure 4 the speckle field surface of intensity distribution that the contrast gone out according to present principles dynamic modulation is 0.50.
Further, the first object lens 7 in the present embodiment are 10 times of object lens, and the second object lens 9 are 20 times of object lens, scattering medium
For nano zinc oxide material.The reflected light of spatial light modulator is incided on scattering medium after the focusing of object lens 1, and by thing
Mirror 2 collects the emergent light of scattering medium, and scattering medium is placed on the common near focal point of two object lens.The outgoing beam of object lens 2 will be in
Existing sporadophyric distribution, the light distribution of the speckle are decided by the phase place change amplitude in spatial light modulator, phase place change amplitude
Bigger, the contrast of this speckle field is smaller, and light distribution is more uniform.
In the implementation case, laser beam analyzer 10 and the coupled composition measuring apparatus of second computer 11, use
In the contrast of measurement speckle field.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of changes, modification can be carried out to these embodiments, replace without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (7)
1. a kind of device of dynamic control speckle field contrast, it is characterised in that include successively：Laser (1), the first lens
(2), the second lens (3), polarizer (4), spatial light modulator (5), the first computer (6), the first object lens (7), scattering medium
And the second object lens (9) (8)；First lens (2) and the second lens (3) composition expand device and are used for the laser (1)
The polarizer (4) is incided after caused laser beam expanding；Light beam caused by the polarizer (4) incides the space
Optical modulator (5)；The reflected light of the spatial light modulator (5) focuses on through first object lens (7), the scattering medium (8)
The near focal point of first object lens (7) is placed in, the emergent light of the scattering medium (8) is received by second object lens (9)
Collect and form speckle field in the exit end of second object lens (9)；The spatial light modulator (5) and first computer
(6) it is connected for the random phase animation for loading phase place change amplitude-controllable caused by first computer (6), to described
Speckle field is modulated, obtain contrast can dynamic control speckle field.
2. the device of dynamic control speckle field contrast according to claim 1, it is characterised in that also include：
Laser beam analyzer (10) and second computer (11)；The second computer (11) is connected with the laser beam analyzer (10)
Connect；The speckle field light intensity of second object lens (9) outgoing gathers via the laser beam analyzer (10), and is calculated by described second
Machine (11) measures the contrast of speckle field.
3. the device of dynamic control speckle field contrast according to claim 1, it is characterised in that the space light modulation
Device (5) is reflective phase type spatial light modulator.
4. the device of dynamic control speckle field contrast according to claim 1, it is characterised in that first computer
(6) the random phase animation on is the phase that spatial stochastically distribution is generated using random function；Introduce parameter c and represent random phase
Amplitude of variation size, the excursion of random phase depends on parameter c, specially the phase place change amplitude of random phase π-
Between c π to π+c π.
5. the device of dynamic control speckle field contrast according to claim 1, it is characterised in that the scattering medium
(8) it is placed in the common near focal point of first object lens (7) and second object lens (9).
A kind of 6. method of dynamic control speckle field contrast, it is characterised in that comprise the following steps：
Laser beam is sent after the first lens (2) and the second lens (3) are expanded by laser (1), then through polarizer (4)
Spatial light modulator (5) is incided after producing polarised light；
The random phase animation of phase place change amplitude-controllable caused by the first computer (6) is loaded in spatial light modulator (5)；
The reflected light of spatial light modulator (5) focuses on through the first object lens (7), incides on scattering medium (8)；Second object lens (9)
The emergent light of scattering medium (8) is collected, and speckle field is produced in its exit end；
Spatial light modulator (5) carries out the phase-modulation of different amplitudes of variation, obtains the speckle field of contrast controllable variations.
7. the method for dynamic control speckle field contrast according to claim 6, it is characterised in that methods described is also wrapped
Include：
The laser beam analyzer (10) gathers the speckle field light intensity of the second object lens (9) outgoing, and by with the beam analysis
The contrast of connected second computer (11) the measurement speckle field of instrument (10).
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Cited By (3)
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| CN108415177A (en) * | 2018-02-27 | 2018-08-17 | 华侨大学 | A kind of device and method quantitatively controlling multimode fibre speckle field focus point degree of polarization |
| CN111190327A (en) * | 2020-01-08 | 2020-05-22 | 中国科学院上海光学精密机械研究所 | Design method of binary modulation screen for generating adjustable X-ray super Rayleigh speckle field |
| CN114924410A (en) * | 2022-05-20 | 2022-08-19 | 西南科技大学 | Focusing method and device based on small phase modulation and phase compensation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108415177A (en) * | 2018-02-27 | 2018-08-17 | 华侨大学 | A kind of device and method quantitatively controlling multimode fibre speckle field focus point degree of polarization |
| CN108415177B (en) * | 2018-02-27 | 2020-06-26 | 华侨大学 | Device and method for quantitatively controlling polarization degree of focus point of multimode fiber speckle field |
| CN111190327A (en) * | 2020-01-08 | 2020-05-22 | 中国科学院上海光学精密机械研究所 | Design method of binary modulation screen for generating adjustable X-ray super Rayleigh speckle field |
| CN111190327B (en) * | 2020-01-08 | 2022-10-11 | 中国科学院上海光学精密机械研究所 | Design method of binary modulation screen for generating adjustable X-ray super Rayleigh speckle field |
| CN114924410A (en) * | 2022-05-20 | 2022-08-19 | 西南科技大学 | Focusing method and device based on small phase modulation and phase compensation |
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