CN202815330U - Laser speckle eliminating device with dodging function - Google Patents
Laser speckle eliminating device with dodging function Download PDFInfo
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- CN202815330U CN202815330U CN 201220452065 CN201220452065U CN202815330U CN 202815330 U CN202815330 U CN 202815330U CN 201220452065 CN201220452065 CN 201220452065 CN 201220452065 U CN201220452065 U CN 201220452065U CN 202815330 U CN202815330 U CN 202815330U
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Abstract
The utility model discloses a laser speckle eliminating device with a dodging function. The laser speckle eliminating device comprises a laser light source, a transmission medium, and a vibration module. The vibration module and the transmission medium are fixedly connected. A scatterer is disposed in the transmission medium. The scatterer is formed by distributing a material different from a material of the transmission medium in uniform density in the transmission medium. The vibration module vibrates under actions of a power supply, and further drives the transmission medium and the scatterer to vibrate together. Vibration amplitude of the transmission medium and the scatterer can be adjusted through adjusting input power of the vibration module until optimal speckle eliminating effect is achieved.
Description
Technical field
The utility model relates to a kind of laser speckle removing device with even light function, belongs to the technique of laser imaging field.
Background technology
Laser has good directionality, and brightness is high, and monochromaticity is good, the characteristic that the coherence is good, and these characteristics make laser be applied in every field just.But because so the coherence of laser then can form speckle noise during good imaging especially, affect image quality, need to control speckle.In the typical hollow, rectangular light laser light beam of laser instrument output, the intensity distributions of light beam is heterogeneous along flow field direction.The unevenness of this light distribution will cause in the laser that thermal deformation heterogeneous occurs numerous mirror surfaces in the transmission channel, thereby makes the wavefront distribution distorted of the final output beam of laser system, causes output beam quality to descend.So will spare light to laser beam.Therefore, make the homogenizer that sends eliminate simultaneously speckle is a problem that faces now.
At high power laser system with in using, wish that the laser beam of output has large fill factor, curve factor, even level and smooth intensity distributions.In amplifier, the inhomogeneous meeting of input beam causes nonlinear effect that output beam quality is degenerated, even damages the laser work thing, is subject in actual applications the impact of system, the light intensity of light beam not only is subject to Modulation and Amplitude Modulation and is an in addition position phase distortion of Gaussian distribution, therefore need to spare light.So-called laser beam light-uniforming technology, the intensity distributions that refers to change the incident laser light beam is needed intensity distributions, adjusts simultaneously the phase place beam splitting control travel path of light beam.
Fig. 1 has illustrated laser speckle to form synoptic diagram, the concept of laser speckle: when light beam shines on the rough surface with diffuse reflection particular-trade, get rid of with observation in catoptrical space and accept light and always can see some spots, laser speckle phenomenon that Here it is.Reason is after electromagnetic wave or the particle beams stand the random scattering of medium, all can form a kind of scattered field of random distribution.When a signal is when being formed by a large amount of subdivision amount additions with independent phase, speckle will appear in signal.These components complex plane pertinent can have at random length and direction at random, known length and direction are at random perhaps arranged.When these component additions, they just consist of so-called " random walk ".Gained with either large or small, depend on the relative phase of each component of summation, especially dominant is to grow mutually or destructive interference.When laser 102 shone unsawn timber surface 101, after passing through the diffuse reflection of rough surface, the A point of two light beams before screen interfered with close light beam such as figure.If the generation constructive interference, then the A point is shown as bright spot, if destructive interference occurs, then the A point is shown as dim spot.Therefore, when the unprocessed direct imaging of laser on object, can show the speckle noise of random distribution on the screen.
Publication number is that the patent disclosure of CN101425656A has adopted the light path that utilizes the quick change such as piezoelectric effect, electrooptical effect, acoustooptic effect and etalon laser cavity length or laser experience to make the method for the quick variation of laser output wavelength or generation saltus step reduce laser speckle effect.The shortcoming of the method is to change this body structure of laser instrument, and the light beam unevenness that has for laser beam itself does not simultaneously improve.
In view of this, need to provide in a kind of situation not changing this body structure of laser instrument, can spare the device of light the eliminate laser speckle while.
The utility model content
The utility model provides a kind of laser speckle removing device with even light function for the deficiencies in the prior art.Technical scheme is as follows:
A kind of laser speckle removing device with even light function, comprise LASER Light Source, transmission medium, vibration module, the vibration module is fixedly connected with transmission medium, in the described transmission medium scatterer is arranged, described scatterer is to be formed in transmission medium with uniform Density Distribution by the material that is different from transmission medium; Described vibration module vibrates under the power supply effect, and then drives described transmission medium and described scatterer vibrates together, regulates the power input of vibration module and regulates the Oscillation Amplitude of transmission medium and scatterer with this, until obtain best speckle eradicating efficacy.
Described laser speckle removing device with even light function, described transmission medium can adopt polymethyl methacrylate, and it is 0.3wt%'s that described scatterer adopts massfraction
Scattering particle.
Described laser speckle removing device with even light function, the vibration frequency of described vibration module is higher than 80Hz.
Advantage and positive effect:
The method speckle can be eliminated and laser-beam uniform-light light combines, and reaches the advantage that simultaneously two problems is solved.Because what adopt is transmission medium with scatterer, scatterer refers to make light soft, does not have the object of obvious projection, so the scattering physical efficiency makes the laser beam of transmission even in transmission course.Vibrational scattering body and transmission medium then refer to the coherence of the laser in the transmission is played destruction, and the strong coherence of laser produces the main cause of speckle just.Wherein the vibration module is adopted in vibration, transmission medium and scatterer is vibrated jointly for the corresponding voltage of vibration module, and different voltage fluctuation frequencies are different, and the effect of eliminating speckle is also different.Can make things convenient for regulation voltage to obtain and eliminate the best image of speckle effect.The utility model adopts technique scheme, disclose a kind of method that can effectively eliminate speckle and even light, simultaneously with respect in other dissipation spot methods, this method need not change this body structure of laser instrument, simple in structure, also have great advantage in laser imaging field.
Description of drawings
Fig. 1 is the principle schematic that laser forms speckle;
Fig. 2 is frame diagram of the present utility model;
Fig. 3 is the structural representation of the utility model embodiment;
Main original paper symbol description: Rough Horizontal Plane 101, LASER Light Source 102, transmission module 201, vibration module 202, imaging object 203, laser beam 301, scatterer 302, transmission medium 303, vibration module 304, power supply 305.
Embodiment
Below in conjunction with specific embodiment, the utility model is elaborated.
Fig. 2 is the laser speckle removing device structural representation with even light function of the present utility model, comprises LASER Light Source, transmission medium, vibration module, and the vibration module is fixedly connected with transmission medium.
Fig. 3 has shown cut-away view of the present utility model and light path principle figure, wherein the laser beam 301 that sends of LASER Light Source is by interior transmission medium 303 transmission that scatterer 302 is arranged, scatterer 302 be by the material that is different from transmission medium 303 with uniform Density Distribution in transmission medium, transmission medium 303 can adopt polymethyl methacrylate generally speaking, and scatterer more than 302 employing massfractions are 0.3wt%'s
Scattering particle.Add vibration module 304 in the transmission medium outside, the vibration under power supply 305 effects of vibration module, and then drive transmission medium 303 and scatterer 302 vibrates together, regulate the power input of vibration module and regulate the Oscillation Amplitude of transmission medium 303 and scatterer 302 with this, until obtain best speckle eradicating efficacy.The vibration frequency General Requirements is greater than the critical flicker frequency of human eye, when frequency is higher than 80Hz, relatively can the width of cloth very near 0, fundamental sensation is less than flicker for human eye, so vibration frequency will be higher than 80Hz.Laser is projected on the imaging object 306 after by the some transmission medium with vibration.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection domain of the utility model claims.
Claims (1)
1. the laser speckle removing device with even light function is characterized in that, comprises LASER Light Source, transmission medium, vibration module, and described vibration module is fixedly connected with described transmission medium, in the described transmission medium scatterer is arranged; Described vibration module is used for vibrating under the power supply effect, drives described transmission medium and described scatterer vibrates together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220452065 CN202815330U (en) | 2012-09-06 | 2012-09-06 | Laser speckle eliminating device with dodging function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220452065 CN202815330U (en) | 2012-09-06 | 2012-09-06 | Laser speckle eliminating device with dodging function |
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| Publication Number | Publication Date |
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| CN202815330U true CN202815330U (en) | 2013-03-20 |
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| CN 201220452065 Expired - Fee Related CN202815330U (en) | 2012-09-06 | 2012-09-06 | Laser speckle eliminating device with dodging function |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102213839A (en) * | 2011-06-21 | 2011-10-12 | 西安邮电学院 | Laser speckle eliminating device with dodging function |
| CN103293700A (en) * | 2013-05-20 | 2013-09-11 | 北京航空航天大学 | Optical mixing rod vibration structure for laser illumination speckle reduction |
| CN108508626A (en) * | 2018-03-16 | 2018-09-07 | 山西大学 | A kind of static diffusion sheet and dissipation spot method of movement scattering particles |
| CN109917558A (en) * | 2013-06-06 | 2019-06-21 | 瑞尔D股份有限公司 | System and method for vibrating screen to reduce speckle |
| CN111238640A (en) * | 2020-03-05 | 2020-06-05 | 中国科学院长春光学精密机械与物理研究所 | Integrating sphere light source device for inhibiting laser speckles |
-
2012
- 2012-09-06 CN CN 201220452065 patent/CN202815330U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102213839A (en) * | 2011-06-21 | 2011-10-12 | 西安邮电学院 | Laser speckle eliminating device with dodging function |
| CN102213839B (en) * | 2011-06-21 | 2013-07-03 | 西安邮电学院 | Laser speckle eliminating device with dodging function |
| CN103293700A (en) * | 2013-05-20 | 2013-09-11 | 北京航空航天大学 | Optical mixing rod vibration structure for laser illumination speckle reduction |
| CN109917558A (en) * | 2013-06-06 | 2019-06-21 | 瑞尔D股份有限公司 | System and method for vibrating screen to reduce speckle |
| CN108508626A (en) * | 2018-03-16 | 2018-09-07 | 山西大学 | A kind of static diffusion sheet and dissipation spot method of movement scattering particles |
| CN111238640A (en) * | 2020-03-05 | 2020-06-05 | 中国科学院长春光学精密机械与物理研究所 | Integrating sphere light source device for inhibiting laser speckles |
| CN111238640B (en) * | 2020-03-05 | 2022-04-05 | 中国科学院长春光学精密机械与物理研究所 | Integrating sphere light source device for inhibiting laser speckles |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130320 Termination date: 20130906 |