CN207232546U - A kind of device of dynamic control speckle field contrast - Google Patents
A kind of device of dynamic control speckle field contrast Download PDFInfo
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- CN207232546U CN207232546U CN201720864019.XU CN201720864019U CN207232546U CN 207232546 U CN207232546 U CN 207232546U CN 201720864019 U CN201720864019 U CN 201720864019U CN 207232546 U CN207232546 U CN 207232546U
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Abstract
Speckle field light intensity control technique is the utility model is related to, a kind of device of dynamic control speckle field contrast is disclosed, includes successively：Laser, the first lens, the second lens, polarizer, spatial light modulator, the first computer, the first object lens, scattering medium and the second object lens；Polarizer is incided after the laser beam expanding that first lens and the second lens produce laser, is again incident on spatial light modulator；The reflected light of spatial light modulator forms speckle field through the first object lens, scattering medium and the second object lens；Spatial light modulator is connected the random phase animation of the phase place change amplitude-controllable produced for loading first computer with the first computer, and the speckle field is modulated, obtain contrast can dynamic control speckle field.The utility model controls speckle field contrast by the phase place change amplitude of random phase animation, and scientific in principle is easy to implement；It is simple in structure, it is easy to adjust, stability is good, can be applied to the fields such as Laser Processing and laser display.
Description
Technical field
It the utility model is related to the light intensity control technique of speckle field, and in particular to a kind of dynamic control speckle field contrast
Device, can easily and efficiently control light beam to form the contrast of speckle field by scattering medium, applied to Laser Processing, swash
Light such as shows at the field.
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, due to the randomness and folding of scattering medium Particle Distribution
The reasons such as the inhomogeneities of rate distribution are penetrated, light will undergo complicated multiple scattering event in scattering medium, and which results in high phase
The laser beam of mass dryness fraction can form the speckle field of light intensity disorder distribution after scattering medium transmits.This speckle field is for swashing
Some applications of light are unfavorable.Such as in laser display, the speckle phenomena on screen can seriously affect image quality, reduce
The resolution ratio and clarity of image.Speckle contrast is to be used to describe one of most common parameter of speckle field property, it is defined
For
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.
Common suppression speckle phenomena, the method for reducing speckle contrast, mainly including following several：1. add machinery fortune
The defects of dynamic element, such as scattering object of movement or the screen of vibration, this method, is to need to add in the optical path at a high speed
The element of movement, can reduce the stability of system.2. by the use of colloidal solution as mobile scattering unit, 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, this method is to the more demanding of light source.
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 device of speckle field contrast processed, there is some shortcomings, existing particularly in terms of the dynamic control of speckle field contrast
Method, it is difficult to realize the real-time dynamic control of speckle field contrast.
Utility model content
The purpose of the utility model is to overcome the deficiency of the prior art, there is provided a kind of dynamic control speckle field contrast
Device, device provided by the utility model can direct dynamic control speckle field contrast, it is easy to operate, give birth on computers
Into the random phase animation of phase place change amplitude-controllable, and it is loaded into spatial light modulator, light beam passes through spatial light tune
Device processed carries out phase-modulation, so that it may realizes the dynamic regulation to speckle field contrast.
Technical solution is used by the utility model solves its technical problem：
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；The linearly polarized light beam that the polarizer produces 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 the scattering medium, is collected by the emergent light of scattering medium by second object lens.
Described device further 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 for the dynamic control speckle field contrast realized based on the utility model device, is included the following steps：
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 the phase place change amplitude-controllable of the first computer generation is loaded in spatial light modulator；
The reflected light of spatial light modulator is focused on through the first object lens, is incided 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.
The method further 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 utility model is the phase place change amplitude by controlling random phase in spatial light modulator, is overcome existing
There is the dynamic control that technology can not realize speckle field contrast.Using spatial light modulator load random phase to laser beam into
Row phase regulates and controls, and will become by the light distribution of speckle field produced by scattering medium by the laser beam of phase-modulation
Change, the contrast of speckle field is determined that phase place change amplitude is bigger by the amplitude of variation of loading random phase, then speckle field contrasts
Degree is lower.According to this principle, the controllable random phase of amplitude of variation in space light modulation loading, it is possible to realize speckle field
The control of contrast.
Compared with prior art, the beneficial effects of the utility model are：
The apparatus structure of dynamic control speckle field contrast is simple, is easy to adjust；Can directly profit it computerized control sky
Between optical modulator random phase amplitude of variation, realize the dynamic control to speckle field contrast, method is simple, reliably；Can be with
Contrast applied to all kinds speckle field regulates and controls, and usage range is wide.
The utility model is described in further detail with reference to the accompanying drawings and embodiments, but one kind of the utility model is moved
The device of state control speckle field contrast is not limited to embodiment.
Brief description of the drawings
Fig. 1 is a kind of structure diagram for dynamic control speckle field contrast device that the utility model embodiment provides.
Reference numeral：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
The following is a combination of the drawings in the embodiments of the present utility model, the technical scheme in the embodiment of the utility model is done into
One step explanation.Obviously, the described embodiments are only a part of the embodiments of the utility model, instead of all the embodiments.
Based on the embodiment in the utility model, what those of ordinary skill in the art were obtained without making creative work
Every other embodiment, shall fall within the protection scope of the present invention.
A kind of structure diagram of dynamic control speckle field contrast device provided in this embodiment, its concrete structure show
It is intended to referring to shown in attached drawing 1；The device includes laser 1, the first lens 2, the second lens 3, polarizer 4, spatial light tune 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 of dynamic control speckle field contrast provided in this embodiment, comprises the following steps that：
Step 1, laser 1 is opened, laser beam is after 3 collimator and extender of the first lens 2 and the second lens, then warp
Polarizer 4 produces linearly polarized light；
Step 2, linearly polarized light incides phase type spatial light modulator 5, by the spatial light tune 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, realizes the control to laser beam phase place change amplitude.
Step 3, the reflected light of spatial light modulator is via the first object lens 7,8 and second object lens 9 of scattering medium, 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
9 composition measuring apparatus of calculation machine, for measuring the contrast of speckle field.
Laser 1 in the present embodiment is He-Ne laser, output power 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, which is reflective phase type spatial light modulator
(German HOLOEYE, PLUTO), loads dynamic random phase and is controlled by the first computer 6 thereon.Produced using the first computer 6
The random phase animation of raw 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 an any number of 0.8 π to 1.2 π, 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.
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 coupled 11 composition measuring apparatus of second computer, are used
In the contrast of measurement speckle field.
While there has been shown and described that the embodiment of the utility model, for the ordinary skill in the art,
It is appreciated that these embodiments can be carried out with a variety of changes in the case where not departing from the principle of the utility model and spirit, repaiied
Change, replace and modification, the scope of the utility model are defined by the appended claims and the equivalents thereof.
Claims (4)
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
(8) and the second object lens (9)；First lens (2) and the second lens (3) composition expand device are used for the laser (1)
The polarizer (4) is incided after the laser beam expanding of generation；The light beam that the polarizer (4) produces incides the space
Optical modulator (5)；The reflected light of the spatial light modulator (5) is focused 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) the random phase animation for the phase place change amplitude-controllable being connected for loading the first computer (6) generation, 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 further 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 is gathered 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 the scattering medium
(8) it is placed in the common near focal point of first object lens (7) and second object lens (9).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720864019.XU CN207232546U (en) | 2017-07-17 | 2017-07-17 | A kind of device of dynamic control speckle field contrast |
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| CN201720864019.XU CN207232546U (en) | 2017-07-17 | 2017-07-17 | A kind of device of dynamic control speckle field contrast |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107422489A (en) * | 2017-07-17 | 2017-12-01 | 华侨大学 | A kind of device and method of dynamic control speckle field contrast |
| CN110274877A (en) * | 2019-05-21 | 2019-09-24 | 西安电子科技大学 | A kind of 3D spectrum imaging system and method based on scattering medium |
| CN110500965A (en) * | 2019-08-22 | 2019-11-26 | 东华大学 | A kind of choosing method of digital speckle pattern interferometry system diaphragm slit size |
| CN110907403A (en) * | 2019-11-18 | 2020-03-24 | 中国科学技术大学 | Device for realizing single direct quantitative phase imaging |
| CN112526761A (en) * | 2020-12-29 | 2021-03-19 | 深圳光隐科技有限公司 | Imaging method based on optical phase control speckle field |
-
2017
- 2017-07-17 CN CN201720864019.XU patent/CN207232546U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107422489A (en) * | 2017-07-17 | 2017-12-01 | 华侨大学 | A kind of device and method of dynamic control speckle field contrast |
| CN110274877A (en) * | 2019-05-21 | 2019-09-24 | 西安电子科技大学 | A kind of 3D spectrum imaging system and method based on scattering medium |
| CN110274877B (en) * | 2019-05-21 | 2021-11-02 | 西安电子科技大学 | 3D spectral imaging system and method based on scattering medium |
| CN110500965A (en) * | 2019-08-22 | 2019-11-26 | 东华大学 | A kind of choosing method of digital speckle pattern interferometry system diaphragm slit size |
| CN110907403A (en) * | 2019-11-18 | 2020-03-24 | 中国科学技术大学 | Device for realizing single direct quantitative phase imaging |
| CN110907403B (en) * | 2019-11-18 | 2021-07-09 | 中国科学技术大学 | Device for realizing single direct quantitative phase imaging |
| CN112526761A (en) * | 2020-12-29 | 2021-03-19 | 深圳光隐科技有限公司 | Imaging method based on optical phase control speckle field |
| CN112526761B (en) * | 2020-12-29 | 2022-04-22 | 苏州光隐科技有限公司 | Imaging method based on optical phase control speckle field |
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