CN202916182U - Material characteristic detecting device based on standing wave-induced transient grating effect - Google Patents
Material characteristic detecting device based on standing wave-induced transient grating effect Download PDFInfo
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- CN202916182U CN202916182U CN 201220613028 CN201220613028U CN202916182U CN 202916182 U CN202916182 U CN 202916182U CN 201220613028 CN201220613028 CN 201220613028 CN 201220613028 U CN201220613028 U CN 201220613028U CN 202916182 U CN202916182 U CN 202916182U
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Abstract
The utility model discloses a material characteristic detecting device based on the standing wave-induced transient grating effect. During use, a pump beam passes through a to-be-tested sample, then is reflected by a reflecting device to enter the inside of the to-be-tested sample again and coincide with the primary incident pump beam, and forms a standing wave due to the optical interference effect, as a result, periodical light distribution is produced and a transient grating is formed; a detecting beam is incident into the transient grating area inside the to-be-tested sample; due to the diffraction effect of the transient grating, the detecting beam is finally divided into a diffraction beam and a transmission beam; and relevant characteristics of the to-be-tested sample material can be obtained through both detecting intensity and phase of the diffraction beam/the transmission beam as well as variation of intensity and phase along with time. The material characteristic detecting device has the advantages as follows: the light path is simple and the transient grating has stable character, so that system integration and microminiaturization of relevant analyzing and detecting instruments are facilitated during actual application, and better reliability and better stability are obtained; and moreover, the device can be applied to multiple fields including photo-thermal detection, photo-acoustic detection, semiconductor dynamic transport property detection, photo-thermal biological and medical detection, photo-thermal spectrum detection and optical material non-linear optics property analysis.
Description
Technical field
The utility model relates to laser excitation transient grating effect and application thereof, specifically a kind of material behavior pick-up unit that excites transient state body grating effect based on standing wave.
Background technology
Laser excitation transient grating technology (the laser-induced transient grating technique) is widely used in characteristic research and the analysis, the particularly research and analysis of material photothermal response, optoacoustic effect, relaxation and transport property and nonlinear optical properties etc. of various types of materials.
The ultimate principle of laser excitation transient grating technology can be described below: two bundle coherent laser beams (usually claiming pump light) are at material surface or inner overlapping, because optical interference effects will produce periodic light distribution in the overlapping region of two-beam; This periodic light distribution will produce periodic spatial modulation to material behavior when interacting with material; This periodic spatial modulation will produce diffraction effect to incident three-beam (usually claiming to survey light) wherein; Survey the correlation properties that the diffraction of light effect just can obtain material by determination and analysis.
According to pump light and the interactional different principle of measured material and concrete detection method thereof, laser excitation transient grating technology can be used to that Photothermal characterisation In, the optoacoustic of analysis of material is corresponding, relaxation and transport property and nonlinear optical properties etc.
Existing laser-induced transient grating technology can be divided into two large classes substantially according to the characteristic of pump light.The first kind is to utilize the continuous laser of intensity modulation to be used as pump light, utilizes the optical absorption of material and the photo-thermal effect that produces or the photoexcitation carrier effect of semiconductor material etc. and obtain the transient grating corresponding with the pump light space distribution.The advantage of the method is to utilize phaselock technique to carry out determination and analysis to surveying the diffraction of light effect, and signal to noise ratio (S/N ratio) is good, and detection sensitivity is high.
Equations of The Second Kind is to utilize pulse laser to be used as pump light.When utilizing pulse laser to be used as pump light, the photoexcitation carrier effect of the optical absorption of material, semiconductor material and the light refractive index nonlinear effect of material etc. can produce the transient grating effect.According to concrete material characteristics and experiment condition, can come the result is carried out Simulation and analysis with one or more physical models during concrete the application, thus the correlation properties of acquisition measured material.
No matter utilize the continuous laser of intensity modulation or utilize pulse laser as pump light source, in existing laser excitation transient grating technology, transient grating all is to form by two interference of restrainting coherent lasers.This method will be divided into two a branch of relevant laser first, and is overlapping at sample surfaces or inside by this two-beam by cover optical devices again, produces interference effect.The advantage of this method is can adjust by the angle of adjusting two-beam in the cycle of transient grating, has stronger dirigibility when measuring; Shortcoming is that light path is comparatively complicated, and the light path alignment error is larger on the Grating Properties impact, thereby is unfavorable in actual applications stability, reliability and the microminiaturization of detection system.
The utility model content
The technical problems to be solved in the utility model provides a kind of material behavior pick-up unit that excites transient state body grating effect based on standing wave, it has the characteristics such as light path is simple, Grating Properties is stable, to be conducive in actual applications the system integration and the microminiaturization of correlation analysis detecting instrument, obtain better reliability and stability.
The technical solution of the utility model is:
Excite the material behavior pick-up unit of transient state body grating effect based on standing wave, include the reflection unit that pump light source, probe source and the relative sample back side arrange.
Described material behavior pick-up unit also includes pump light filtering beam-expanding collimation system, Pu light-beam position Adjustment System and the pump light condenser lens that is arranged in turn between pump light source and the sample surface, be arranged in turn detection light filtering beam-expanding collimation system, the detecting light beam position adjustment between probe source and sample surface or the side and survey the light condenser lens, and be arranged at the pump light collimation lens between the sample back side and the reflection unit.
Described reflection unit includes catoptron clamping adjusting gear and the high reflectivity mirror that is arranged on the catoptron clamping adjusting gear.
Described material behavior pick-up unit also includes the detection optical alignment lens, the detecting light beam that are arranged in turn the sample back side or rear end, another side and adjusts lens, surveys the light spatial filter, surveys light optical filter and photodetector.
Principle of the present utility model:
Transient state body grating of the present utility model is along with the light intensity of pump light changes and changes, when pump light disappears, it also will disappear after through one section relaxation time, the transient state body grating will produce diffraction effect to incident detection light wherein, and survey the correlation properties that the diffraction of light effect just can obtain material by determination and analysis.
The utility model can be ignored the impact that sample inside stationary field distributes from the Multi reflection phenomenon at sample surface and the back side, this ignoring is suitable for being coated with the optical sample of antireflecting film, and it also is basic applicable for the very large sample of the relative pump light coherent length of gauge in addition; And in other cases, then can avoid the sample surfaces multipath effect field distribution produces a very large impact to sample body standing internal wave by the relative pump light inclination of sample certain angle is placed, as shown in Figure 3.
Advantage of the present utility model:
(1), light path of the present utility model is simple, Grating Properties stable, will be conducive in actual applications the system integration and the microminiaturization of correlation analysis detecting instrument, obtains better reliability and stability;
(2), the utility model is being surveyed under the condition that light path is consistent, pump light source power is identical, do not need pump light is carried out light splitting, therefore its interference stationary field intensity that excites strengthens a lot than traditional two-beam interference method, this in actual applications can be in the requirement that keeps reducing by a relatively large margin in the constant situation of detection sensitivity to the power level of pump light source, thereby reduces by a relatively large margin cost, the volume and weight of coherent detection and analytical instrument.
Description of drawings
Fig. 1 is example structure synoptic diagram of the present utility model.
Embodiment
See Fig. 1, the utility model excites a kind of structural representation of implementing the allusion quotation example of the material behavior pick-up unit of transient state body grating effect based on standing wave, include pump light source 1, probe source 3, the reflection unit that relative sample 2 back sides arrange, be arranged in turn the pump light filtering beam-expanding collimation system 4 between pump light source 1 and sample 2 surfaces, Pu light-beam position Adjustment System 5 and pump light condenser lens 6, be arranged in turn the detection light filtering beam-expanding collimation system 7 between probe source 3 and sample 2 surfaces, detecting light beam position adjustment 8 and detection light condenser lens 9, and be arranged at pump light collimation lens 10 between sample 2 back sides and the reflection unit, be arranged in turn the detection optical alignment lens 13 of rear end, sample 2 back side, detecting light beam is adjusted lens 14, survey light spatial filter 15, survey light optical filter 16 and photodetector 17; Wherein, reflection unit includes catoptron clamping adjusting gear 11 and the high reflectivity mirror 12 that is arranged on the catoptron clamping adjusting gear 11, the placed angle of sample 2 satisfies between the incident direction of its sample 2 surfaces and pump beam and forms rational angle, forms Multi reflection and affects the stationary field distribution of sample interior in sample interior to avoid pump light.
Utilization specifically may further comprise the steps based on the method that standing wave excites the material behavior pick-up unit of transient state body grating effect to detect:
(1), pump light source 1 is sent the pulse pump light beam, carry out the relative position adjustment by pump beam position adjustment 5 behind the pulse pump light beam process filtering beam-expanding collimation system 4, then focus on the inside of sample 2 by pump light condenser lens 6, pump light condenser lens 6 has relatively long focal length, pump beam after the focusing has long depth of focus and suitable lateral dimension in sample 2 inside, then behind the pump beam process pump light collimation lens 10 of sample 2 outgoing, reflected by high reflectivity mirror 12, overlapping at sample 2 inner and initial incident pump beams, and in the overlapping region, form stationary field; High reflectivity mirror 12 is clipped on the catoptron clamp device 11 that can adjust flexibly angle and position; Because there is optical absorption in 2 pairs of pump beam wavelength of sample, the stationary field that forms in the overlapping region will form the periodicity Temperature Distribution modulation corresponding with the stationary field light intensity in respective regions, thereby excite the thermal transient grating effect, this thermal transient grating effect will be surveyed by a kind of detecting light beam of another wavelength;
(2), probe source 3 sends the detecting light beam different from pumping laser Shu Bochang, carry out the relative position adjustment by detecting light beam position adjustment 8 behind the detecting light beam process filtering beam-expanding collimation system 7, then focus on sample 2 inside by surveying light condenser lens 9, detecting light beam incident direction and transient state body grating normal are angled, survey light condenser lens 9 and have suitable focal length, detecting light beam after the focusing has long depth of focus and suitable lateral dimension in sample 2 inside, and in suitably position and the light activated transient state body grating interaction of pumping of out of focus, produce diffraction effect; The detecting light beam part of incident is diffracted, directly transmission of a part, and namely final detecting light beam is divided into diffracted beam and transmitted light beam;
(3), transmitted light beam adjusts lens 14 by detecting light beam behind the optical alignment lens 13 and converges through surveying, converging beam incides on the photodetector 17 after surveying light spatial filter 15 and surveying light optical filter 16 after adjusting lens 14 outgoing by detecting light beam; The major function of surveying light spatial filter 15 is that elimination permeation body grating diffration light derives from and the parasitic light of surveying the same wavelength of light with other, the major function of surveying light optical filter 16 is to see through to survey light and filter out simultaneously the parasitic light that derives from pump light and other wavelength, the light intensity signal that photodetector 17 obtains and can detect by certain testing circuit and computing machine over time, analysis and calculation.If pump light is pulsed light, then testing circuit is generally sync correlation testing circuit (such as the Boxcar integrator); If pump light is the continuous light of intensity modulated, then testing circuit is generally phase-lock detecting circuit (such as the Lock-in amplifier).
Because optical absorption, calorifics, relaxation and the transport property of the depth of modulation of the transient state body grating that excites of stationary field and relaxation time etc. and sample and nonlinear optical properties etc. all may be closely related, according to concrete experiment condition, by using suitable physical model and analytical approach, laser excitation transient grating technology can be used to that Photothermal characterisation In, the optoacoustic of analysis of material is corresponding, relaxation and transport property and nonlinear optical properties etc.
Claims (4)
1. excite the material behavior pick-up unit of transient state body grating effect based on standing wave, include pump light source and probe source, it is characterized in that: described material behavior pick-up unit also includes the reflection unit that the relative sample back side arranges.
2. the material behavior pick-up unit that excites transient state body grating effect based on standing wave according to claim 1, it is characterized in that: described material behavior pick-up unit also includes the pump light filtering beam-expanding collimation system that is arranged in turn between pump light source and the sample surface, Pu light-beam position Adjustment System and pump light condenser lens, be arranged in turn the detection light filtering beam-expanding collimation system between probe source and sample surface or the side, detecting light beam position adjustment and survey the light condenser lens, and be arranged at the pump light collimation lens between the sample back side and the reflection unit.
3. according to claim 1 and 2ly excite the material behavior pick-up unit of transient state body grating effect based on standing wave, it is characterized in that: described reflection unit includes catoptron clamping adjusting gear and is arranged at high reflectivity mirror on the catoptron clamping adjusting gear.
4. according to claim 3ly excite the material behavior pick-up unit of transient state body grating effect based on standing wave, it is characterized in that: described material behavior pick-up unit also includes the detection optical alignment lens, the detecting light beam that are arranged in turn the sample back side or rear end, another side and adjusts lens, surveys the light spatial filter, surveys light optical filter and photodetector.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220613028 CN202916182U (en) | 2012-11-20 | 2012-11-20 | Material characteristic detecting device based on standing wave-induced transient grating effect |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220613028 CN202916182U (en) | 2012-11-20 | 2012-11-20 | Material characteristic detecting device based on standing wave-induced transient grating effect |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944518A (en) * | 2012-11-20 | 2013-02-27 | 合肥知常光电科技有限公司 | Material property detecting method and device based on grating effect of standing wave excitation transient body |
| CN109459415A (en) * | 2018-11-30 | 2019-03-12 | 中国工程物理研究院流体物理研究所 | A kind of Laser Transient optical-mechanical system that space periodic is continuously adjustable |
-
2012
- 2012-11-20 CN CN 201220613028 patent/CN202916182U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944518A (en) * | 2012-11-20 | 2013-02-27 | 合肥知常光电科技有限公司 | Material property detecting method and device based on grating effect of standing wave excitation transient body |
| CN102944518B (en) * | 2012-11-20 | 2015-12-02 | 合肥利弗莫尔仪器科技有限公司 | The material behavior detection method of transient state body grating effect is excited based on standing wave |
| CN109459415A (en) * | 2018-11-30 | 2019-03-12 | 中国工程物理研究院流体物理研究所 | A kind of Laser Transient optical-mechanical system that space periodic is continuously adjustable |
| CN109459415B (en) * | 2018-11-30 | 2021-06-15 | 中国工程物理研究院流体物理研究所 | Laser transient grating system with continuously adjustable space period |
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Granted publication date: 20130501 |