CN101839763B - High-brightness controllable pseudo-thermal light source based on liquid crystal light valve modulation - Google Patents
High-brightness controllable pseudo-thermal light source based on liquid crystal light valve modulation Download PDFInfo
- Publication number
- CN101839763B CN101839763B CN2010101650615A CN201010165061A CN101839763B CN 101839763 B CN101839763 B CN 101839763B CN 2010101650615 A CN2010101650615 A CN 2010101650615A CN 201010165061 A CN201010165061 A CN 201010165061A CN 101839763 B CN101839763 B CN 101839763B
- Authority
- CN
- China
- Prior art keywords
- liquid crystal
- light valve
- crystal light
- optical axis
- analyzer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Polarising Elements (AREA)
- Liquid Crystal (AREA)
Abstract
The invention discloses a high-brightness controllable pseudo-thermal light source based on liquid crystal light valve modulation, which comprises a pulsed laser, an adjustable beam expanding and collimating system, a polarizer, a first analyzer, an adjustable aperture diaphragm, a liquid crystal light valve, a second analyzer and a liquid crystal light valve control system. The pulsed laser, the adjustable beam expanding and collimating system, the polarizer, the first analyzer and the adjustable aperture diaphragm are arranged on the same optical axis. The optical axis is arranged on the incident light optical axis of the liquid crystal light valve. The second analyzer is arranged on the reflected light optical axis of the liquid crystal light valve corresponding to the incident light optical axis. Laser light output by the laser finally irradiates the liquid crystal light valve controlled by a liquid crystal light valve control system. Through controlling the liquid crystal light valve, a dynamic speckle field, i.e. a pseudo-thermal light field is obtained. The thermal fluctuation of the high-brightness controllable pseudo-thermal light source produced by the invention can be truly recorded by the photoelectric detection system of a limited transmission band, the cross spectrum purity conditions satisfying a true-thermal light field can be obtained through controlling RGB images loaded on the liquid crystal light valve and the pseudo-thermal light field produced at any time is controllable.
Description
Technical field
The present invention relates to optics component and optical system, particularly a kind of high-brightness controllable pseudo thermal light source based on the liquid crystal light valve modulation.
Background technology
Two basic difficult points at the hot light fluctuation of experiment measuring: the first, the coherence time of hot light is very short, even the quasi-monochromatic light of sending for best line spectrum light source, also can only reach 10 coherence time
-11-10
-10Second; The second, existing photo-detector, the response time is the fastest just to reach 10
-9Second.Therefore existing photodetector, can't measure hot light field fluctuation instantaneous strength [see Qi Kangnan, Qin Kecheng, Cheng Lu. statistical optics introduction, P410].
In order to overcome this two difficulties, Martienssen and Spiller have invented the counterfeit thermal light source of a kind of continous way and [have seen W.Martienssen in 1964, E.Spiller, " Coherence and Fluctuations in LightBeams ", American Journal ofPhysics 32,8 (1964) .].2006, in order to overcome the problems such as cross-spectral purity condition that the counterfeit thermal light source of continous way does not satisfy true hot light field, people such as the Han Shensheng of Shanghai Optics and Precision Mechanics institute, Chinese Academy of Sciences have invented a kind of high-light pulse type pseudo-thermal light source and [have seen Liu Honglin, Zhang Minghui, Wei Qing. the 12 national quantum optics academic meeting paper summary collection .2006.].Above-mentioned technology is used to simulate the fluctuation of true hot light field; Owing to have very long coherence time, can be detected hot light fluctuation by existing photodetector; And since its can the true hot light field of reasonable simulation the ASSOCIATE STATISTICS characteristic, institute thinks that studying the field relevant with hot light field fluctuation provides condition.But above-mentioned counterfeit thermal light source also has certain limitation, mainly shows:
1. there is the bigger mechanical outflow of population in the frosted glass plate of rotation, for application of practical project has caused inconvenience.
2. experiment is repeatable relatively poor, is difficult to precise calibration.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of high-brightness controllable pseudo thermal light source based on the liquid crystal light valve modulation.
The thermal fluctuation of this counterfeit hot light field can be recorded truly by existing Photodetection system, and not have the mechanical outflow of population, as long as by the RGB picture signal of control loaded on liquid crystal light valve, just can control liquid crystal light valve and modulate, produce counterfeit thermal light source, experiment is repeatable high.
Technical solution of the present invention is as follows:
A kind of high-brightness controllable pseudo thermal light source based on the liquid crystal light valve modulation, its formation comprises pulsed laser 1, adjustable beam-expanding collimation system 2, the polarizer 3, first analyzer 4, adjustable aperture diaphragm 5, liquid crystal light valve 6, second analyzer 7 and liquid crystal light valve control system 11, described pulsed laser 1, adjustable beam-expanding collimation system 2, the polarizer 3, first analyzer 4, adjustable aperture diaphragm 5 is positioned on the same optical axis 9, described optical axis 9 is positioned on the incident light optical axis of liquid crystal light valve 6, and described optical axis 9 has a certain degree with the normal of liquid crystal light valve 6, when hope obtained the light field of pure phase position modulation, described angle was less than 6 °.Described second analyzer 7 be positioned at above-mentioned incident light optical axis 9 corresponding reflected light optical axises 10 on, the laser of described pulsed laser 1 output, be radiated on the liquid crystal light valve 6 by 11 controls of liquid crystal light valve control system, be carried in control signal on the liquid crystal light valve by change, obtain required speckle field, promptly counterfeit hot light field.
Described liquid crystal light valve adopts pure phase position high resolution matrix type liquid crystal light valve, computing machine produces the driving circuit that a RGB picture signal is passed to liquid crystal light valve, and then driving liquid crystal light valve, the value of RGB image every bit has determined the phase pushing figure of liquid crystal light valve output beam, the value of control RGB image every bit just can be controlled the phase shift of liquid crystal light valve every bit, thereby distribution is modulated to the light beam space phase.
The period T of the control signal that loads on the described liquid crystal light valve equates with the interval of delta t of described pulsed laser output laser pulse:
Δt＝T
Described liquid crystal light valve control system is in one-period, and the pulse that is used to trigger laser instrument is used to allow the modulation result of liquid crystal light valve settle out than the pulse daley 20ms that is used to trigger liquid crystal light valve.
Described liquid crystal light valve control system is carried in the RGB image on the liquid crystal light valve, and in one-period, the value of each point is uncorrelated on the image; The value of each point on two width of cloth images in the different cycles also is incoherent each other.
The extinction ratio of the described polarizer 3 and first analyzer 4 is 500: 1, because the liquid crystal light valve of pure phase position modulation is relatively more responsive to the polarization of incident light attitude, by regulating the polarizer 3 and first analyzer 4, make that the laser beam that incides on the liquid crystal light valve is a linearly polarized light as far as possible, and the polarization direction is parallel with the slow-axis direction of liquid crystal light valve.
Technique effect of the present invention:
This counterfeit thermal light source has all statistical properties of hot light field, and has solved the difficulty under original technical background:
High brightness, because the energy of single speckle field pulse is by the energy decision of laser instrument individual pulse, and because what adopt is the liquid crystal light valve of pure phase position modulation, the laser energy loss after the modulation of output is little.
Do not have the machinery change,, just can change the light field of output, just can not realize different light field modulation so do not need to change light path because liquid crystal light valve only needs control loaded RGB image information thereon.
Repeatable good, on same experiment condition, load identical RGB image information, just can obtain same light field, for calibration provides possibility.
Description of drawings
Fig. 1 is the high-brightness controllable pseudo thermal light source apparatus structure block diagram that the present invention is based on the liquid crystal light valve modulation system, among the figure:
1: pulsed laser, 2: adjustable beam-expanding collimation system, 3: the polarizer, 4: the first analyzers, 5: adjustable aperture diaphragm, 6: liquid crystal light valve, 7: the second analyzers, 8: counterfeit hot light field, 9: incident light optical axis, 10: reflected light optical axis, 11: the liquid crystal light valve control system.
The spatial intensity distribution figure of speckle field in coherence time that Fig. 2 produces for the embodiment of the invention.
Embodiment
The invention will be further described below in conjunction with embodiment and accompanying drawing, but should not limit protection scope of the present invention with this.
See also Fig. 1, Fig. 1 is the high-brightness controllable pseudo thermal light source apparatus structure block diagram that the present invention is based on the liquid crystal light valve modulation system, it also is one embodiment of the invention, as seen from the figure, the present invention is based on the high-brightness controllable pseudo thermal light source of liquid crystal light valve modulation, its formation comprises pulsed laser 1, adjustable beam-expanding collimation system 2, the polarizer 3, first analyzer 4, adjustable aperture diaphragm 5, liquid crystal light valve 6, second analyzer 7 and liquid crystal light valve control system 11, described pulsed laser 1, adjustable beam-expanding collimation system 2, the polarizer 3, first analyzer 4, adjustable aperture diaphragm 5 is positioned on the same optical axis 9, described optical axis 9 is positioned on the incident light optical axis of liquid crystal light valve 6, and described optical axis 9 has a certain degree with the normal of liquid crystal light valve 6, when hope obtains the light field of pure phase position modulation, described angle is less than 6 °.Described second analyzer 7 be positioned at above-mentioned incident light optical axis 9 corresponding reflected light optical axises 10 on, the laser of described pulsed laser 1 output, be radiated on the liquid crystal light valve 6 by 11 controls of liquid crystal light valve control system, be carried in control signal on the liquid crystal light valve by change, obtain required speckle field, promptly counterfeit hot light field.
The pulsed laser 1 of present embodiment adopts 650nm wave band semiconductor pulsed laser.
The liquid crystal light valve 6 of present embodiment adopts the XY face battle array phase type liquid crystal light valve ModelA512 of BNS company, it is an a pure phase position high resolution matrix type liquid crystal light valve, produce the driving circuit that a RGB picture signal is passed to liquid crystal light valve by computing machine, and then driving liquid crystal light valve, the value of each point of RGB image has determined the phase pushing figure of the corresponding pixel output beam of liquid crystal light valve, the value of control RGB image every bit just can be controlled the phase shift of liquid crystal light valve every bit, thereby distribution is modulated to the light beam space phase.
The period T of the control signal that loads on the liquid crystal light valve 6 of present embodiment equates with the interval of delta t of the laser pulse of described pulsed laser 1 output:
Δt＝T
The liquid crystal light valve control system 11 of present embodiment is in one-period, and the pulse that is used for trigger pulse formula laser instrument 1 is used to allow the modulation result of liquid crystal light valve settle out than the pulse daley 20ms that is used to trigger liquid crystal light valve 6.
The liquid crystal light valve control system 11 of present embodiment is carried in the RGB image on the liquid crystal light valve 6, and in one-period, the value of each point is uncorrelated on the image; The value of each point on two width of cloth images in the different cycles also is incoherent each other.
The polarizer 3 of present embodiment and the extinction ratio of first analyzer 4 500: 1, because the liquid crystal light valve of pure phase position modulation is relatively more responsive to the polarization of incident light attitude, by regulating the polarizer 3 and first analyzer 4, make that the laser beam that incides on the liquid crystal light valve 6 is a linearly polarized light as far as possible, and the polarization direction is parallel with the slow-axis direction of liquid crystal light valve 6.
The extinction ratio of second analyzer 7 of present embodiment is 500: 1, because through the light field after the liquid crystal light valve modulation, polarization state can produce certain variation, by the effect of second analyzer 7, the counterfeit hot light field that obtains is a linearly polarized light.
Laser pulse is after collimation, filtering, analyzing, project on the liquid crystal light valve 6, the size of hot spot is by adjustable aperture diaphragm 5 decisions, influence for the aperture diffraction phenomena that reduces liquid crystal light valve self device, simultaneously can make full use of each pixel on the liquid crystal light valve, suggestion aperture diaphragm size equates with the liquid crystal light valve useful area.
The spatial intensity distribution figure of speckle field in coherence time that Fig. 2 produces for the embodiment of the invention, its high-contrast shows that this counterfeit thermal light source is applicable to the detection in coherence time.
Claims (5)
1. high-brightness controllable pseudo thermal light source based on the liquid crystal light valve modulation system, it is made of pulsed laser (1), adjustable beam-expanding collimation system (2), the polarizer (3), first analyzer (4), adjustable aperture diaphragm (5), liquid crystal light valve (6), second analyzer (7) and liquid crystal light valve control system (11), it is characterized in that:
Described liquid crystal light valve (6) adopts pure phase position high resolution matrix type liquid crystal light valve;
Described pulsed laser (1), adjustable beam-expanding collimation system (2), the polarizer (3), first analyzer (4), adjustable aperture diaphragm (5) are positioned on the same optical axis (9), described optical axis (9) is positioned on the incident light optical axis of liquid crystal light valve (6), and the normal of the same liquid crystal light valve of described optical axis (9) (6) has a certain degree, when hope obtained the light field of pure phase position modulation, described angle was less than 6 °;
Described second analyzer (7) is positioned at on the corresponding reflected light optical axis of above-mentioned incident light optical axis (10);
The laser radiation of described pulsed laser (1) output is carried in control signal on the liquid crystal light valve (6) by change on the liquid crystal light valve (6) by liquid crystal light valve control system (11) control, obtain required speckle field, promptly counterfeit hot light field.
2. a kind of high-brightness controllable pseudo thermal light source based on the liquid crystal light valve modulation system according to claim 1 is characterized in that: the period T that described liquid crystal light valve (6) is gone up the control signal that loads equates with the interval of delta t of the laser pulse of described pulsed laser (1) output: Δ t=T.
3. a kind of high-brightness controllable pseudo thermal light source according to claim 1 based on the liquid crystal light valve modulation system, it is characterized in that: described liquid crystal light valve control system (11) is in one-period, and the pulse that is used for trigger pulse formula laser instrument (1) is than the pulse daley that is used to trigger liquid crystal light valve (6) 20ms at least.
4. a kind of high-brightness controllable pseudo thermal light source according to claim 1 based on the liquid crystal light valve modulation system, it is characterized in that: described liquid crystal light valve control system (11) is carried in the RGB image on the liquid crystal light valve (6), in with one-period, the value of each point is uncorrelated on the image; The value of each point on two width of cloth images in the different cycles also is incoherent each other.
5. a kind of high-brightness controllable pseudo thermal light source according to claim 1 based on the liquid crystal light valve modulation system, it is characterized in that: the extinction ratio of the described polarizer (3) and first analyzer (4) is 500: 1, make that by regulating the polarizer (3) and first analyzer (4) laser beam that incides on the liquid crystal light valve (6) is a linearly polarized light, and the polarization direction is parallel with the slow-axis direction of liquid crystal light valve (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101650615A CN101839763B (en) | 2010-04-29 | 2010-04-29 | High-brightness controllable pseudo-thermal light source based on liquid crystal light valve modulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101650615A CN101839763B (en) | 2010-04-29 | 2010-04-29 | High-brightness controllable pseudo-thermal light source based on liquid crystal light valve modulation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101839763A CN101839763A (en) | 2010-09-22 |
| CN101839763B true CN101839763B (en) | 2011-06-22 |
Family
ID=42743276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101650615A Active CN101839763B (en) | 2010-04-29 | 2010-04-29 | High-brightness controllable pseudo-thermal light source based on liquid crystal light valve modulation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101839763B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103256503B (en) * | 2013-04-19 | 2015-04-15 | 中国科学院上海光学精密机械研究所 | Preparation method for addressing type high-speed pseudo-thermal light source |
| CN105223698B (en) * | 2015-09-21 | 2018-04-17 | 西安电子科技大学 | A kind of counterfeit thermal light source based on array beams |
| CN107479223A (en) * | 2017-09-01 | 2017-12-15 | 中恩光电科技（苏州）有限公司 | Realize the device of laser spacescan |
| CN109164464A (en) * | 2018-10-12 | 2019-01-08 | 北醒（北京）光子科技有限公司 | A kind of scanning means and laser radar |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5751916A (en) * | 1994-05-03 | 1998-05-12 | Yamatake-Honeywell Co. Ltd. | Building management system having set offset value learning and set bias value determining system for controlling thermal environment |
| CN101013048A (en) * | 2007-01-30 | 2007-08-08 | 中国科学院上海光学精密机械研究所 | High-brightness pulse type pseudo-thermal light source |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS574569A (en) * | 1980-06-10 | 1982-01-11 | Kasei Optonix Co Ltd | Thermal fluorescent dosimeter element |
-
2010
- 2010-04-29 CN CN2010101650615A patent/CN101839763B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5751916A (en) * | 1994-05-03 | 1998-05-12 | Yamatake-Honeywell Co. Ltd. | Building management system having set offset value learning and set bias value determining system for controlling thermal environment |
| CN101013048A (en) * | 2007-01-30 | 2007-08-08 | 中国科学院上海光学精密机械研究所 | High-brightness pulse type pseudo-thermal light source |
Non-Patent Citations (1)
| Title |
|---|
| JP昭57-4569A 1982.01.11 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101839763A (en) | 2010-09-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109343077B (en) | Liquid crystal phased array ghost imaging system and imaging method thereof | |
| JP6702689B2 (en) | Liquid crystal Fourier transform imaging spectrometer | |
| US9500442B2 (en) | Holographic gun sight | |
| CN101556386B (en) | Interference type double-imaging measurement device for multi-parameters of liquid crystal spatial light modulator | |
| CN101839763B (en) | High-brightness controllable pseudo-thermal light source based on liquid crystal light valve modulation | |
| WO2015101352A1 (en) | Optical polarisation modulation and detection apparatus and detection method | |
| CN111142266B (en) | Vector light beam generation and dynamic regulation and control device and method | |
| CN103776537B (en) | A kind of measurement mechanism of polarised light stokes parameter and optimization method thereof | |
| Dev et al. | Mueller–Stokes polarimetric characterization of transmissive liquid crystal spatial light modulator | |
| US10746603B2 (en) | Optical device for obtaining 3D spatial information | |
| US11880114B2 (en) | Ferroelectric liquid crystals Dammann grating for light detection and ranging devices | |
| CN112284686B (en) | Aberration measuring device and method | |
| CN112629662A (en) | Reconfigurable time-sharing polarization analysis system and detection method | |
| CN102662250B (en) | Light intensity equalizer | |
| CN108051090B (en) | The polarization parameter detection system of helical polarization light field | |
| CN112461381B (en) | Device for measuring orbital angular momentum spectrum of vortex light beam | |
| CN103257036B (en) | The method of vertical cavity surface emitting laser chamber mould splitting is measured under a kind of room temperature | |
| CN108761956A (en) | A kind of liquid crystal optical phased array bore expansion system and method | |
| US10670520B2 (en) | Optical analysis device and optical analysis method | |
| CN105973467A (en) | Acousto-optic signal processing system based on compressed sensing | |
| CN106896546B (en) | method for improving diffraction efficiency of nematic liquid crystal light modulation device | |
| Yuan et al. | 52‐3: Fast‐response Cloud‐point Ferroelectric Liquid Crystal Dammann Grating for LiDAR Applications Based on Double‐cell setup | |
| CN102749187B (en) | Method for measuring polarization fidelity of optical film | |
| CN201417203Y (en) | Multi-parameter interference bi-imaging measurement device of liquid crystal spatial light modulator | |
| CN210534313U (en) | Alkali metal atom spin polarization regulation and control device based on phase delay |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |