CN105403534A - Method for measuring transient optical nonlinearity of material - Google Patents
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- 238000005516 engineering process Methods 0.000 description 10
- 230000007246 mechanism Effects 0.000 description 7
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Abstract
The invention discloses a method for measuring transient optical nonlinearity of a material. The pump light passing through the delay line is focused on a sample to be measured, so that the nonlinear sample generates optical nonlinearity; the detection light passing through the sample is divided into two beams by the spectroscope, one beam directly enters a first detector, and the other beam passes through a circular baffle plate, then passes through a circular small hole and then enters a second detector; the method is characterized in that: in the optical path of the detection light, a circular baffle is arranged in a far field, and the measuring steps are as follows: putting a sample to be detected, and collecting the energy of detection light at different moments by using two detectors respectively; processing the detection light energy curves with different delay times to obtain optical nonlinear parameters. The measuring system working according to the method of the invention has the advantages of very high sensitivity, simple data processing, capability of simultaneously measuring nonlinear absorption and refraction, no need of separate operation and the like.
Description
Technical field
The present invention relates to a kind of optical instrument that utilizes testing or the method for analysis of material, be specifically related to a kind of nonlinear optics physical mechanism of research material and measure the method for its optical physics parameter, belonging to nonlinear photon material and nonlinear optics field of information processing.
Background technology
The develop rapidly of non-linear optical field be unable to do without the research to optical nonlinearity material.The perfect optics nonlinear material finding various uses is a very important task of non-linear optical field.The material with large optical nonlinearity coefficient and super fast photoresponse is considered to the brand-new material for the manufacture of high speed optoelectronic equipment, in optical engineering field, as there being huge potential using value in the components and parts such as all-optical switch.The research of optical nonlinearity material is then needed by means of various optical nonlinearity measuring technique.Optical nonlinearity measuring technique is one of gordian technique of research nonlinear optical material.In optical nonlinearity sample, generally more than a kind of Nonlinear Mechanism, usually can there are two kinds of even more Nonlinear Mechanism and interact, and general nonlinear measurement technology can not distinguish various optical nonlinearity mechanism very simply.Z scan method (MansoorSheik-Bahae, AliA.Said, Tai-HuiWei, DavidJ.Hagan, E.W.VanStryland. " Sensitivemeasurementofopticalnonlinearitiesusingasingleb eam ", IEEEJ.QuantumElect, 26,760-769 (1990)) be that single beam the most frequently used at present measures materials optical non-linear method, the method proposes on the basis of beam aberration measuring method, and its advantage is that light path is simple, and disposal route is simple, measuring accuracy is high, and can measure non-linear absorption and refraction simultaneously.But this method is difficult to optical nonlinearity mechanism and some concrete important optical physics parameters of material of determining material accurately.
On the basis of Z-scan, the people such as J.Wang in 1994 propose time resolution Z-scan technology (J.Wang, M.Sheik-Bahae, A.A.Said, D.J.Hagan, andE.W.VanStryland, " Time-resolvedZ-scanmeasurementsofopticalnonlinearities ", J.Opt.Soc.Am.B, 11,1009-1017,1994).This method is by determining the nonlinear mechanism of materials optical and the important optical physics parameter of each energy level to the analysis not detecting the position phase of light and the situation of change of intensity in the same time of sample outgoing.But this method is cumbersome when measuring the sample time dependent feature of nonlinear refraction, due to not in the same time the space distribution of laser and energy be different, thus larger measuring error can be caused.A kind of phase object (PO) pumping detecting method (JunyiYang of nearest proposition, YinglinSong, YuxiaoWang, ChangweiLi, XiaoJin, andMinShui.Time-resolvedpump-probetechnologywithphaseobj ectformeasurementsofopticalnonlinearities.OpticsExpress, 17,7110-7116 (2009)), this method can measure non-linear absorption and nonlinear refraction dynamic process simultaneously, but the sensitivity of this method is subject to the restriction of main optical path T-PO technology.Time in addition for nondegenerate nonlinear refraction kinetic measurement, different phase objects need be changed according to the detection wavelength of correspondence.The present invention proposes the nonlinear technology of a kind of measurement material transient optical state, can overcome the shortcoming that Conventional temporal differentiates Z-scan and PO pump probe technology.
Summary of the invention
The object of this invention is to provide a kind of measurement material transient optical state non-linear method, for the detection of the non-linear particularly nonlinear refraction of materials optical, determine the optical nonlinearity mechanism of material and the important nonlinear optical mathematic(al) parameter of material can be measured accurately simultaneously.
For achieving the above object, the technical solution used in the present invention is: laser beam is divided into two bundles, and the beam intensity ratio of light beam is comparatively strong, and the beam intensity ratio of light beam is more weak in addition.Light intensity is more a branch of is pump light, more weak a branch of be detection light, the pump light containing time delay line focuses on testing sample 14, makes sample produce optical nonlinearity; Described testing sample 14 is arranged on the focal plane of detection light light path lens 13, the detection light of outgoing is divided into two bundles through a spectroscope 15, a branch ofly directly enter the first detector 17, another bundle is by entering the second detector after a circular iris and a circular baffle plate, it is characterized in that: the far-field position after the sample of detection light path does not place aperture, but placed a circular hole and a light tight baffle plate of circle, its measuring process is:
1. testing sample is placed on the focal position of lens, collects with two detectors the energy not detecting light in the same time respectively, obtain the detection luminous energy curve of different time;
2. the detection luminous energy curve of the different time delays of above-mentioned acquisition is processed, the optical nonlinearity parameter of the test material needed for acquisition.
In technique scheme, described step 2. in process comprise, make the normalized transmission potential of perforate and the baffle plate normalization change curve with time delay respectively, wherein perforate normalization transmission potential is only relevant with non-linear absorption with the change curve of time delay, baffle plate normalization has relation with the change curve of time delay and non-linear absorption and nonlinear refraction, carries out matching obtain size about the optical parameter of non-linear absorption and life-span to perforate normalization transmission potential with the change curve of time delay; When nonlinear absorption parameter is known, by carrying out with the change curve of time delay the numerical value that matching obtains nonlinear refraction associated arguments to baffle plate normalization.
Wherein in technique scheme, the size of described circular hole and circular baffle plate will regulate according to the size of the diffraction main spot at detection light path far field place, allows the diffraction light at edge pass through, and the transmitance after circular hole and baffle combination is less than 0.001.
In technique scheme, the time delay of described pump light is realized by two catoptrons and a prism, is changed the direction of pump light, regulate the spacing between prism and catoptron by catoptron, and change pump light to the distance of sample, realize the adjustment to time delay.
In technique scheme, the moving range of described prism is 0 to 30cm, and time delay scope is-100ps to 1.9ns.
Preferred technical scheme, described baffle plate meets lens imaging to the distance of lens with the distance of the aperture to lens that produce flat-top light and formula is preferred.
Preferred technical scheme, described detection light and pump light focus on angle (α) on testing sample at 3 ° within the scope of 8 °.
In technical scheme of the present invention, what nonlinear sample was subject to pump light excites rear generation optical nonlinearity, has an impact to the amplitude of incident light and phase place; Again due to optical nonlinearity along with the time is constantly change, so be different for the impact that detection light does not in the same time produce, just can be measured non-linear absorption and the nonlinear refraction time response curve of sample by the situation analyzing not detection light in the same time simultaneously, thus the absorption cross section of each energy level and life-span and refractive index volumes can be determined.
Compared with prior art, technical scheme of the present invention has the following advantages:
1. systematic survey sensitivity is very high, two orders of magnitude higher than Z-scan and PO pump probe technology;
2. the measurement of this method to non-linear absorption and nonlinear refraction completes simultaneously;
3. in this method, pump light and detection light are not sought common ground axle, and can intersect with a little angle, by sample, the latter two are separated automatically, very convenient when thus using detector Received signal strength; And based on traditional Z scan method pumping detecting method due to pump light and detection light coaxial, the separation problem of light beam must be considered after light beam is by sample, particularly when pump light and detection optical wavelength close to or equal time light path can more bother;
4. measuring method of the present invention, the research fields such as nonlinear optics measurement, nonlinear photon material, nonlinear optics information processing and photonic device can be widely used in, especially the key link such as test and modification of nonlinear optical functional material, utilize the inventive method, can ensure that test parameter is comprehensive, test result is accurate, greatly reduces the error of measurement; This method is simple to optical path requirements in addition, and test speed is quick.
Accompanying drawing explanation
Accompanying drawing 1 is the circular aperture schematic diagram in the embodiment of the present invention one;
Accompanying drawing 2 is the circular baffle plate schematic diagram in the embodiment of the present invention one;
Accompanying drawing 3 is fundamental diagrams of the measurement material transient optical state non-linear method in the embodiment of the present invention one;
Accompanying drawing 4 be in the embodiment of the present invention one baffle plate normalized transmittance with the variation diagram of time delay:
Wherein: 1, incoming laser beam; 2, beam splitter; 3, pump beam; 4, catoptron; 5, right-angle prism; 6, catoptron; 7, convex lens; 8, detecting light beam; 9, catoptron; 10, convex lens; 11, convex lens; 12, circular aperture; 13, convex lens; 14, testing sample; 15, beam splitter; 16, convex lens; 17, the first detector; 18, circular aperture; 19, circular baffle plate; 20, convex lens; 21, the second detector.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described:
Embodiment one: shown in accompanying drawing 2, method in technique scheme, to detect based on light path and pumping light path, pumping light path primarily of two catoptrons 4,6, right-angle prism 5, convex lens 7 form, right-angle prism 5 can change the distance of pump light to sample, i.e. time delay by anterior-posterior translation; Detect light path primarily of catoptron 9, convex lens 10, convex lens 11, circular aperture 12, convex lens 13, beam splitter 15, convex lens 16, circular aperture 18, circular baffle plate 19, convex lens 20, the first detector 17 and the second detector 21 form; Pumping light path focuses on testing sample 14 with detection light path simultaneously.
Utilize beam splitter 2 that laser pulse 1 is divided into pump beam 3 and detecting light beam 8.Detecting light beam 8 changes direction through catoptron 9, expand through convex lens 10 and convex lens 11, laser after expanding forms flat-top light after small holes 12, light beam planoconvex lens 13 converges to and is placed on the testing sample 14 of focus, after beam splitter 15, be divided into two-beam, transmission a branch of after aperture 18 and circular baffle plate 19, planoconvex lens 20 is received by the second detector 21 after assembling, and is received after a branch of planoconvex lens 16 convergence of reflection by the first detector 17; Pump beam 3 is through catoptron 4, right-angle prism 5, the delay platform that catoptron 6 is formed, focus on testing sample 14 by convex lens 7, make testing sample 14 produce optical nonlinearity, the absorption and refraction detecting light is had an impact, again because optical nonlinearity is constantly change in time, anterior-posterior translation right-angle prism 5 can produce different impacts to not detection light in the same time, and is received by the second detector 21 and the first detector 17.
In the present embodiment, laser beam is 532nm laser, pulsewidth 21ps.Sample is DMF solvent, and it is very weak in the non-linear linear absorption at 532nm place, and nonlinear refraction is mainly Kerr effect.
Concrete detecting step is: (1) blocks detection light before sample, the second detector 21 is placed on the position of sample 14, measures the energy of pump light.(2) put sample 14, anterior-posterior translation right-angle prism 6, record the energy of the detection light of different time delay continuously.(3) the normalized transmission potential of perforate and the closed pore normalization change curve with time delay is made respectively.
The experimental and theoretical computation detailed process measured for DMF optical nonlinearity is as follows:
Considering that the slow amplitude that becomes is similar to the situation test light-metering in the sample to which communication satisfaction approximate with thin sample
Δ n is variations in refractive index, and Δ α is absorption coefficient change, the light path that z' laser is propagated in the sample to which.In DMF solvent, non-linear absorption is very weak, and the main nonlinear refraction considering that optical kerr effect causes changes.
Δn＝n
2I(3)
Because visit in experiment at pump, to detect light ratio pump light weak much doubly, so can think that Fig. 3 that Kerr effect is mainly produced by pump light is the empirical theory curve of the nonlinear refraction result of the pump probe of DMF solvent.In experiment, the energy of pump light is set to 1.7 μ J by us, other measuring conditions and being consistent above.Measurement result as shown in Figure 4, the nonlinear refraction of DMF is caused by Kerr effect, when can find to carry out closed pore measurement by PO time resolution pump probe technology to solvent DMF from figure, curve has almost no change, and is straight line (the little figure of upper right).Illustrate that solvent DMF is after heavy pumping optical excitation, nonlinear response signal still by the identification of weak detection light, can not cannot carry out nonlinear measurement by the time resolution pump probe technology of phase object under this energy condition.We also study the nonlinear refraction effect of solvent DMF by high sensitivity baffle plate pump probe technology under the same conditions, and as can be seen from measurement result, there is an obvious nonlinear response, normalized transmittance curve is still a unimodal shape.
Claims (7)
1. measure a material transient optical state non-linear method, laser beam is divided into two bundles, and the beam intensity ratio of light beam is comparatively strong, and the beam intensity ratio of light beam is more weak in addition; Light intensity is more a branch of is pump light, more weak a branch of be detection light, the pump light containing time delay line focuses on testing sample 14, makes sample produce optical nonlinearity; Described testing sample 14 is arranged on the focal plane of detection light light path lens 13, the detection light of outgoing is divided into two bundles through a spectroscope 15, a branch ofly directly enter the first detector 17, another bundle is by entering the second detector after a circular iris and a circular baffle plate, it is characterized in that: the far-field position after the sample of detection light path does not place aperture, but placed a light tight baffle plate of circle, its measuring process is:
1. testing sample is placed on the focal position of lens, collects with two detectors the energy not detecting light in the same time respectively, obtain the detection luminous energy curve of different time;
2. the detection luminous energy curve of the different time delays of above-mentioned acquisition is processed, the optical nonlinearity parameter of the test material needed for acquisition.
2. measurement material transient optical state non-linear method according to claim 1, it is characterized in that: described step 2. in process comprise, make the normalized transmission potential of perforate and the baffle plate normalization change curve with time delay respectively, with the change curve of time delay, matching is carried out to perforate normalization transmission potential and obtains size about the optical parameter of non-linear absorption and life-span; When nonlinear absorption parameter is known, by carrying out with the change curve of time delay the numerical value that matching obtains nonlinear refraction associated arguments to baffle plate normalization.
3. the nonlinear measuring method of material transient optical state according to claim 1, the far-field position after the sample of detection light path places a light tight baffle plate of circle and a circular hole.
4. one according to claim 1 measures material transient optical state non-linear method, it is characterized in that: the time delay of described pump light is realized by two catoptrons and a prism, the direction of pump light is changed by catoptron, regulate the spacing between prism and catoptron, and change pump light to the distance of sample, realize the adjustment to time delay.
5. measurement material transient optical state non-linear method according to claim 1, is characterized in that: the moving range of described prism is 0 to 30cm, and time delay scope is-100ps to 1.9ns.
6. measurement material transient optical state non-linear method according to claim 1, is characterized in that: preferred technical scheme, and described baffle plate meets lens imaging to the aperture of distance and the generation flat-top light of lens to the distance of lens and formula is preferred.
7. measurement material transient optical state non-linear method according to claim 1, is characterized in that: preferred technical scheme, and described detection light and pump light focus on angle () on testing sample at 4 ° within the scope of 8 °.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106198450A (en) * | 2016-07-22 | 2016-12-07 | 中国工程物理研究院激光聚变研究中心 | A kind of device measuring material nonlinearity absorption curve |
| CN108593604A (en) * | 2018-05-30 | 2018-09-28 | 中国工程物理研究院激光聚变研究中心 | Non-linear nature tests system and non-linear nature test method |
| CN109115707A (en) * | 2018-09-07 | 2019-01-01 | 中国工程物理研究院激光聚变研究中心 | A kind of transient absorption detection system and method |
| CN109883952A (en) * | 2019-02-28 | 2019-06-14 | 上海交通大学 | A kind of nonlinear factor measuring device and its measurement method based on weak measuring technique |
| CN113670581A (en) * | 2021-07-30 | 2021-11-19 | 重庆邮电大学 | Transient absorption test system and method for optical element |
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| CN201072406Y (en) * | 2007-08-06 | 2008-06-11 | 苏州大学 | Pump detecting device based on 4f phase coherent imaging |
| CN102539391A (en) * | 2012-01-18 | 2012-07-04 | 常熟微纳激光光子技术有限公司 | Device for measuring optical non-linearity of material by single-pulse flat-top light and measuring method thereof |
| CN102645408A (en) * | 2012-03-30 | 2012-08-22 | 常熟微纳激光光子技术有限公司 | Phase object Z-scan-based pump-probe method |
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| CN201072406Y (en) * | 2007-08-06 | 2008-06-11 | 苏州大学 | Pump detecting device based on 4f phase coherent imaging |
| CN102539391A (en) * | 2012-01-18 | 2012-07-04 | 常熟微纳激光光子技术有限公司 | Device for measuring optical non-linearity of material by single-pulse flat-top light and measuring method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106198450A (en) * | 2016-07-22 | 2016-12-07 | 中国工程物理研究院激光聚变研究中心 | A kind of device measuring material nonlinearity absorption curve |
| CN106198450B (en) * | 2016-07-22 | 2019-02-22 | 中国工程物理研究院激光聚变研究中心 | A kind of device measuring material nonlinearity absorption curve |
| CN108593604A (en) * | 2018-05-30 | 2018-09-28 | 中国工程物理研究院激光聚变研究中心 | Non-linear nature tests system and non-linear nature test method |
| CN109115707A (en) * | 2018-09-07 | 2019-01-01 | 中国工程物理研究院激光聚变研究中心 | A kind of transient absorption detection system and method |
| CN109883952A (en) * | 2019-02-28 | 2019-06-14 | 上海交通大学 | A kind of nonlinear factor measuring device and its measurement method based on weak measuring technique |
| CN113670581A (en) * | 2021-07-30 | 2021-11-19 | 重庆邮电大学 | Transient absorption test system and method for optical element |
| CN113670581B (en) * | 2021-07-30 | 2022-07-22 | 重庆邮电大学 | Transient absorption test system and method for optical element |
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