CN209707833U - A kind of device for eliminating laser speckle - Google Patents
A kind of device for eliminating laser speckle Download PDFInfo
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- CN209707833U CN209707833U CN201920649723.2U CN201920649723U CN209707833U CN 209707833 U CN209707833 U CN 209707833U CN 201920649723 U CN201920649723 U CN 201920649723U CN 209707833 U CN209707833 U CN 209707833U
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Abstract
The utility model relates to a kind of laser aids, especially a kind of device for eliminating laser speckle, including the second reflection unit, second reflection unit is equipped with the second reflecting surface, second reflection unit is located at the side of laser die group, and the second reflecting surface of second reflection unit is used for reflection laser light beam；And piezoelectric ceramics, the piezoelectric ceramics are fixed on the back side of the second reflecting surface of the second reflection unit.A kind of device for eliminating laser speckle provided by the utility model can effectively control the speckle of laser, low cost, be easily assembled that adjusting, performance is stable, easy to use, optical path is simple, energy loss is few, structure is simple, system stability is good.
Description
Technical field
The utility model relates to a kind of laser aid, especially a kind of device for eliminating laser speckle.
Background technique
The features such as high brightness, high coherence and high collimation that laser has due to it, in industry, communication, medicine, science
The fields such as research and social life have played unique and vital effect.Since multimode optical fiber coupled laser diode has efficiency
The advantages that high, small in size, the service life is long, thus using multimode optical fiber coupled laser diode module laser medicine, laser detection with
Measurement, instrument and meter etc. have a wide range of applications.Laser has high coherence and amplitude and the mutually different light beam in position,
Graininess speckle --- the laser speckle of random distribution is formed in spatial points.Laser speckle is as a kind of random process
The objective physical phenomenon for using and certainly existing with laser.Laser speckle not only causes energy loss, while also becoming
Picture quality is limited, the principal element of image resolution ratio and contrast is reduced, it is such as aobvious in the laser projection studied and applied at present
Show and field of laser illumination, laser speckle become limitation laser display and realize really practical key；It is sharp about eliminating at present
The method of light speckle is varied, can be divided into two classes in general: the speckle method one is static state disappears；The second is dynamic speckle method.
Static state disappears speckle method
It such as reduces laser chamber length or in the optical path to beam is closed after incident beam beam splitting again, reduces incident beam coherence.
This method is complicated for operation, and optical path connective stability is low." laser-beam uniform-light light shaping dissipation spot dress disclosed in CN102122081A
Set " even light shaping and dissipation spot function are completed under electromagnetic oscillation device driving using by pure phase position diffractive optical element；Chinese patent
" a method of eliminate laser speckle effect " disclosed in CN101950087A by incident beam by vibration can light passing liquid
Body destroys beam phase and eliminates laser speckle effect.But this method is complicated for operation, optical path connective stability is poor.
Dynamic speckle method
Dynamic processing is carried out to laser speckle, averagely inhibits speckle using the time.Such as rotation or vibrational scattering body (hair glass
Glass, liquid-crystal apparatus, phase-plate), supercritical ultrasonics technology etc..When using dynamic speckle method, speckle variations frequency is faster, correlation between speckle
Smaller, speckle inhibitory effect is better after the time is average, but takes dynamic speckle method at present structure is complicated, the stabilization of system
Property is bad.During speckle is eliminated at present, speckle refrequency control range is limited, and phase adjusted depth is small so that speckle correlation is larger,
Factors above reduces speckle inhibitory effect, while incident beam is lower by liquid-crystal apparatus and frosted glass capacity usage ratio, energy
Amount loss is big, and along with angular spread phenomenon, affects the performance of system.
Utility model content
To solve the above problems, the utility model provides, one kind is easy to use, optical path is simple, energy loss is few, structure is simple
A kind of device of single, system stability is good, speckle control effect is good elimination laser speckle, the specific technical proposal is:
A kind of device for eliminating laser speckle, including the second reflection unit, it is anti-that second reflection unit is equipped with second
Face is penetrated, second reflection unit is located at the side of laser die group, and the second reflecting surface of second reflection unit is for anti-
Penetrate laser beam；And piezoelectric ceramics, the piezoelectric ceramics are fixed on the back side of the second reflecting surface of the second reflection unit.
By using above-mentioned technical proposal, laser beam is after piezoelectric ceramic vibration acts on, the vertical transfer side of hot spot
The only movement of sub-micrometer scale upwards, and periodic motion in a certain range in integration process, to realize hot spot
Elimination.
It preferably, further include the first reflection unit, first reflection unit is located at laser die group and fills with the second reflection
Between setting, first reflection unit is equipped with the first reflecting surface, and first reflecting surface is parallel with the second reflecting surface, and described the
One reflecting surface is for reflection laser light beam to the second reflecting surface.
By using above-mentioned technical proposal, the first reflection unit and the second reflection unit are with the use of guarantee laser die group
The direction of the laser beam of output remains unchanged.
Preferably, area of the area of the piezoelectric ceramics not less than the cross section of laser beam.
By using above-mentioned technical proposal, the area that the area of piezoelectric ceramics is all larger than laser beam can effectively ensure that sharp
The movement of sub-micrometer scale all occurs for light light beam.
Preferably, the angle of first reflecting surface and laser beam is 45 ° ± 3 °.
By using above-mentioned technical proposal, angle can guarantee the directive property of laser beam certain when being 45 ° ± 3 °
It is consistent with original direction inside range.
Preferably, first reflecting surface and the second reflecting surface are coated with reflectance coating, and the area of the reflectance coating, which is greater than, to swash
The reflectivity of the area of the cross section of light light beam, the reflectance coating is greater than 99%.
By using above-mentioned technical proposal, reflectivity can effectively reduce greatly the loss of laser energy.
Preferably, the area of first reflecting surface and the second reflecting surface is after laser beam energy loses 13.5%
Three times of numerical value；
S=E* (100-13.5) %*3
Wherein, in formula
S is area, unit mm；
E is the energy of laser beam.
By using above-mentioned technical proposal, the stability and integrality of hot spot are improved.
Preferably, the piezoelectric ceramics is piezoelectric bimorph.
By using above-mentioned technical proposal, the free end of these piezoelectric bimorphs can be bent generation displacement, the width of displacement
The bias of degree and direction and application has functional relation.Twin lamella is made of multilayer co-firing piezoceramics layer, the ceramic layer upper half
The bias voltage control divided is not influenced by ceramic layer lower half portion bias.The voltage being applied on ceramic layer increases, the length of ceramic layer
Degree also can be elongated therewith.When the extension amount of upper and lower ceramic layer is different, the free end of twin lamella will generate displacement.On for example,
Layer extend and lower layer it is constant when, twin lamella will generate downward displacement.The displacement that these twin lamellas can produce is ± 450 μ
m。
A method of eliminating laser speckle, comprising the following steps:
The laser beam that laser die group issues is irradiated on the first reflecting surface of the first reflection unit, and the first reflecting surface will
Laser beam is reflected on the second reflecting surface of the second reflection unit, and the second reflecting surface projects laser beam.
Preferably, the control mode of the piezoelectric ceramics is unilateral voltage control or differential voltage control.
Compared with prior art the utility model has the following beneficial effects:
A kind of device for eliminating laser speckle provided by the utility model can effectively control the speckle of laser, low cost,
It is easily assembled that adjusting, performance is stable, easy to use, optical path is simple, energy loss is few, structure is simple, system stability is good.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of device for eliminating laser speckle；
Fig. 2 is the speckle schematic diagram before a kind of device of elimination laser speckle is implemented；
Fig. 3 is the speckle schematic diagram after a kind of device of elimination laser speckle is implemented.
Specific embodiment
Now in conjunction with attached drawing, the utility model is described in further detail.
As shown in Figure 1 to Figure 3, a kind of device for eliminating laser speckle, including the first reflection unit 103, the first reflection dress
It sets 103 and is equipped with the first reflecting surface, the first reflection unit 103 is located at the side of laser die group 301, and the first reflecting surface is opposite to swash
Light device mould group 301；Second reflection unit 102, the second reflection unit 102 are equipped with the second reflecting surface, the first reflecting surface and second
Reflecting surface is parallel, and the first reflecting surface is used for 201 to the second reflecting surface of reflection laser light beam；And piezoelectric ceramics 101, piezoelectric ceramics
101 are fixed on the back side of the second reflecting surface of the second reflection unit 102.
Laser beam 201 only has sub-micron after 101 effect of vibration of piezoelectric ceramics on the vertical transfer direction of hot spot
The movement of magnitude, and periodic motion in a certain range in integration process, to realize the elimination of hot spot.
First reflection unit 103 and the second reflection unit 102 are with the use of the laser light for guaranteeing that laser die group 301 exports
The direction of beam 201 remains unchanged.
The angle of first reflecting surface and laser beam 201 is 45 ° ± 3 °.Angle can guarantee laser when being 45 ° ± 3 °
Portion is consistent with original direction in a certain range for the directive property of light beam 201.
Area of the area of piezoelectric ceramics 101 not less than the cross section of laser beam 201.The area of piezoelectric ceramics 101 is equal
Area greater than laser beam 201 can effectively ensure that the movement of sub-micrometer scale all occurs for laser beam 201.
Further, the first reflecting surface and the second reflecting surface are coated with reflectance coating, and the area of reflectance coating is greater than laser beam
The reflectivity of the area of 201 cross section, reflectance coating is greater than 99%.Reflectivity can effectively reduce greatly the loss of laser energy.
The area of first reflecting surface and the second reflecting surface is the numerical value after 201 energy loss 13.5% of laser beam
Three times；
S=E* (100-13.5) %*3
Wherein, in formula
S is area, unit mm；
E is the energy of laser beam 201.
The stability and integrality of hot spot are improved by this area.
Piezoelectric ceramics 101 is piezoelectric bimorph.The free end of piezoelectric bimorph can be bent generation displacement, the amplitude of displacement
There is functional relation with the bias of direction and application.Twin lamella is made of multilayer co-firing piezoceramics layer, ceramic layer top half
Bias voltage control do not influenced by ceramic layer lower half portion bias.The voltage being applied on ceramic layer increases, the length of ceramic layer
It also can be elongated therewith.When the extension amount of upper and lower ceramic layer is different, the free end of twin lamella will generate displacement.For example, upper layer
Extend and lower layer it is constant when, twin lamella will generate downward displacement.The displacement that these twin lamellas can produce is ± 450 μm.
The time for exposure that laser speckle detects when detecting is greater than twice of piezoelectric ceramic vibration period, convenient for exposing at one
The data volume after weighted integral homogenizes is obtained in time.
A method of eliminating laser speckle, comprising the following steps: the laser beam 201 that laser die group 301 issues shines
It is mapped on the first reflecting surface of the first reflection unit 103, laser beam 201 is reflected into the second reflection unit by the first reflecting surface
On 102 the second reflecting surface, the second reflecting surface projects laser beam 201.
Wherein, the control mode of piezoelectric ceramics 101 is unilateral voltage control or differential voltage control.
Claims (7)
1. a kind of device for eliminating laser speckle, which is characterized in that including
Second reflection unit, second reflection unit are equipped with the second reflecting surface, and second reflection unit is located at laser
Second reflecting surface of the side of mould group, second reflection unit is used for reflection laser light beam；And
Piezoelectric ceramics, the piezoelectric ceramics are fixed on the back side of the second reflecting surface of the second reflection unit.
2. a kind of device for eliminating laser speckle according to claim 1, which is characterized in that further include the first reflection dress
It sets, for first reflection unit between laser die group and the second reflection unit, first reflection unit is equipped with the
One reflecting surface, first reflecting surface is parallel with the second reflecting surface, and first reflecting surface is for reflection laser light beam to second
On reflecting surface.
3. a kind of device for eliminating laser speckle according to claim 2, which is characterized in that the area of the piezoelectric ceramics
Not less than the area of the cross section of laser beam.
4. it is according to claim 2 it is a kind of eliminate laser speckle device, which is characterized in that first reflecting surface and swash
The angle of light light beam is 45 ° ± 3 °.
5. a kind of device for eliminating laser speckle according to claim 2, which is characterized in that first reflecting surface and the
Two reflectings surface are coated with reflectance coating, and the area of the reflectance coating is greater than the area of the cross section of laser beam, the reflectance coating
Reflectivity is greater than 99%.
6. a kind of device for eliminating laser speckle according to claim 5, which is characterized in that first reflecting surface and the
The area of two reflectings surface is three times of the numerical value after laser beam energy loss 13.5%；
S=E* (100-13.5) %*3
Wherein, in formula
S is area, unit mm；
E is the energy of laser beam.
7. a kind of device for eliminating laser speckle according to claim 1, which is characterized in that the piezoelectric ceramics is piezoelectricity
Twin lamella.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920649723.2U CN209707833U (en) | 2019-05-08 | 2019-05-08 | A kind of device for eliminating laser speckle |
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| CN201920649723.2U CN209707833U (en) | 2019-05-08 | 2019-05-08 | A kind of device for eliminating laser speckle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109975991A (en) * | 2019-05-08 | 2019-07-05 | 无锡迈微光电科技有限公司 | A kind of devices and methods therefor for eliminating laser speckle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109975991A (en) * | 2019-05-08 | 2019-07-05 | 无锡迈微光电科技有限公司 | A kind of devices and methods therefor for eliminating laser speckle |
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