CN208888136U - A kind of ultrashort one pulse time resolution pump probe instrument - Google Patents
A kind of ultrashort one pulse time resolution pump probe instrument Download PDFInfo
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Abstract
The utility model discloses a kind of ultrashort one pulse times to differentiate pump probe instrument, the laser that laser output comes is divided into pump light and detection light, pump light is non-linear through being allowed to generate on lens focus to nonlinear sample；Detection light detects the variation generated by pumping photoinduction nonlinear sample after delay reflecting mirror reflection, image is received by image acquiring sensor, in the case where the detection light Jing Guo different time delays, the case where variation for the detection luminous intensity being emitted from sample reflects the particle's occupancy in different moments sample, so that it is determined that absorption cross-section and the service life of each energy level, it is very convenient by the measuring system measurement of the utility model method work, there is no the movement of sample, only a laser pulse is needed to be obtained with time resolution pump probe curve, it is very simple compared with traditional pump probe optical path to test optical path, time delay is realized without mobile platform high-precision in conventional light path, only need a time delays reflecting mirror that can realize time delay.
Description
Technical field
The utility model belongs to nonlinear photon material and nonlinear optics technical field of information processing, and in particular to one
The nonlinear optics physical mechanism of kind research material and the system for measuring its optical physics parameter.
Background technique
With the rapid development of the fields such as optic communication and optical information processing technology, the research of nonlinear optical material is increasingly heavy
It wants.The realization of the functions such as optical logic, optical memory, optical transistor, photoswitch and phase complex conjugate depends on non-linear
The progress of optical material.Optical nonlinearity measuring technique is one of the key technology of research nonlinear optical material, wherein
Understand fully the optical nonlinearity mechanism of material, how accurately to determine the important physical parameter of material for how application material right and wrong
It is often important.Z scan method (Mansoor Sheik-Bahae, Ali A.Said, Tai-Hui Wei, David J.Hagan,
E.W.Van Stryland.“Sensitive measurement of optical nonlinearities using a
Single beam ", IEEE J.Quantum Elect, 26,760-769 (1990)) it is most common single beam measurement material
Expect optical non-linear method, the method is proposed on the basis of beam aberration measurement method, its advantage is that optical path is simple,
Processing method is simple, and measurement accuracy is high, and can measure non-linear absorption and refraction simultaneously.But this method is difficult accurately really
The optical nonlinearity mechanism and material for determining material correspond to important optical physics parameter.
On the basis of Z-scan, J.Wang in 1994 et al. propose time resolution Z-scan technology (J.Wang,
M.Sheik-Bahae, A.A.Said, D.J.Hagan, and E.W.Van Stryland, " Time-resolved Z-scan
Measurements of optical nonlinearities ", J.Opt.Soc.Am.B, 11,1009-1017,1994).This
Kind method determines that materials optical is non-linear by the analysis of the situation of change for the different moments detection luminous intensity being emitted to sample
Mechanism and the important optical physics parameter of each energy level.But this method is changed over time in measurement sample nonlinear refraction
Feature when it is more troublesome, and application condition is big, specific manifestation are as follows: the non-linear absorption of sample need to be first measured when (1) measuring
Temporal characteristics, sample is then individually placed to the measurement that two positions carry out nonlinear refraction temporal characteristics again, is finally also wanted
Remove the influence of non-linear absorption.(2) measurement that non-linear absorption and nonlinear refraction temporal characteristics cannot be carried out simultaneously, due to
The spatial distribution and energy of different moments laser are different, to can cause biggish measurement error.In addition there are also one kind can
To measure phase object pump probe technology (the Junyi Yang, Yinglin of Nonlinear Transient absorption and nonlinear refraction simultaneously
Song, Yuxiao Wang, Changwei Li, Xiao Jin, and Min Shui, " Time-resolved pump-probe
Technology with phase object for measurements of optical nonlinearities ",
Optics Express 17,7110-7116 (2009)), it is exactly to be detected on the basis of original tradition pumping detection system
The position of the lens front focal plane of optical path adds a phase object.
But these above-mentioned technologies have the characteristics that one it is common, require to realize that two-beam prolongs by mobile platform
Late, to realize time resolution.During experiment, multiple pumping pulse laser materials is needed to obtain a time resolution song
Knot fruit.A pulse pump light is such as only existed, which cannot obtain the time resolution indicatrix of material.
Utility model content
The purpose of this utility model is that structure is complicated and is readily incorporated for mobile platform delay line in the traditional pump probe of solution
The problem of systematic error.
In order to achieve the above objectives, the technical solution adopted in the utility model is: a kind of ultrashort one pulse time resolution pumping
Survey meter, including laser, delay reflecting mirror, beam splitter, detection optical path and pumping optical path, image acquiring sensor；Described
Delay reflecting mirror is made of one group of stair-stepping reflecting surface；The light that the laser issues is divided into institute after the beam splitter
The detection optical path and pumping optical path stated；The pumping optical path focuses on sample to be tested, and detection optical path is incident to the delay
By the stair-stepping reflective surface to the sample to be tested after reflecting mirror, it is attached that image acquiring sensor is placed on sample to be tested
Proximity receives the light spot image being emitted from sample.The image acquiring sensor includes CCD, CMOS and other Image Acquisition lists
Member.
In above-mentioned technical proposal, since delay reflecting mirror is made of one group of stair-stepping reflecting surface, laser light incident is to often
A stair-stepping surface, then different optical path differences can be generated via between the light beam after each ladder reflective surface, thus often
It will generation time delay between a light beam.After the nonlinear sample after the excitation by pump light, due in sample
Population number is continually changing with the time, and the influence generated for the detection light of different moments is different, and visits from sample
The variation for surveying the intensity of light beam can learn the population situation in this moment sample, by the spy for analyzing different moments
The situation for surveying light can measure the non-linear absorption time response curve of sample simultaneously, may thereby determine that each energy level
Absorption cross-section and service life.Requirement of the measuring system that the utility model method provides to optical path substantially reduces, and reduces system pair
The requirement of mobile platform；Sample does not need to move during measurement, it is only necessary to which a laser pulse can be obtained by test sample
The time resolution pump probe curve of product.
In above-mentioned technical proposal, the reflecting surface for the reflecting mirror that is delayed is a stairstepping, and wherein the height of ladder is by laser arteries and veins
It rushes width and the measuring precision determines.The width of reflecting mirror ladder by imaging size in imaging system and article size ratio
Value and image acquiring sensor Pixel Dimensions determine that algorithm is that ladder width (W)=N* image acquiring sensor Pixel Dimensions/are
System amplification factor, N are the number of shared pixel；The height of ladder determines delay time resolution ratio, can be determined according to pulse width
Fixed, specific algorithm is ladder height (the h)=delay time resolution ratio * light velocity/2.
The technical program measurement realized to nonlinear elasticity parameter, with other nonlinear optics measuring technique phases
Than having the advantage that
1. measuring very convenient, the not movement of sample, it is only necessary to which a laser pulse is obtained with time resolution pump
It is very simple compared with traditional pump probe optical path to test optical path for Pu detective curve.
2. realizing time delay without high-precision mobile platform in conventional light path, it is only necessary to a time delays reflection
Mirror can realize time delay.
3. can be widely applied to nonlinear optics measurement, nonlinear photon material, nonlinear optics information processing
With the key links such as the test and modification of research fields, especially nonlinear optical functional material such as photonic device, this reality is utilized
With novel method, it can guarantee that test parameter is comprehensive, test result is accurate, greatly eliminates the interference of uncertain factor；Separately
Outer this method is simple to the quality and optical path requirements of laser, and test speed is quick.
Detailed description of the invention
Fig. 1 is delay reflecting mirror schematic diagram；
Fig. 2 is the working principle diagram of the pumping detecting method based on time delays reflecting mirror；
Fig. 3 is linear beam spot figure when not placing sample to be tested；
Fig. 4 is the non-linear hot spot figure placed after sample to be tested；
Fig. 5 is the normalization time resolution pump probe curve obtained by image procossing；
Wherein: 1, incoming laser beam；2, beam splitter；3, optical path is detected；4, optical path is pumped；5, the first reflecting mirror；6, second
Reflecting mirror；7, the first convex lens；8, beam splitter；9, be delayed reflecting mirror；10, the second convex lens；11, sample to be tested；12, image is adopted
Collect sensor.
Specific embodiment
The utility model is further described with reference to the accompanying drawings and embodiments:
Embodiment: a kind of ultrashort one pulse time resolution pump probe instrument, based on detecting optical path and pumping optical path, pump
Pu optical routing reflecting mirror, convex lens group at；Detect optical routing reflecting mirror, beam splitter, time delays reflecting mirror, convex lens, image
Acquire sensor composition, the delay time of the changeable detection light of time delays reflecting mirror；Pumping optical path is gathered simultaneously with detection optical path
Coke is on sample to be tested.
Laser pulse 1 is divided into detection optical path 3 and pumping optical path 4 using beam splitter 2, detects optical path 3 after beam splitter 8
After vertically being reflected by time delays reflecting mirror 9 (or time delays reflecting mirror 9 directly replaces beam splitter 8 to change beam propagation side
To), it is focused on sample to be tested 11 by the second convex lens 10, after sample to be tested 11, is received by image acquiring sensor 12；
It pumps optical path 4 and passes through the first reflecting mirror 5, the second reflecting mirror 6 is focused on sample to be tested 11 by the first convex lens 7, made to test sample
The particle that product 11 are in ground state is transitted to excitation state, absorption of the variation of population number distribution to detection optical path 3 by excitation
Have an impact, but due to population number be at any time it is continually changing, the light beam after being reflected by time delays reflecting mirror 9 can be with
The variation of different moments is detected, and is received by image acquiring sensor 12.
In the present embodiment, laser beam is Yb dosed optical fiber (Yb:KGW) femtosecond laser of Light Conversion company
The later 515nm laser of device frequency multiplication, pulsewidth 190fs.Image acquiring sensor is ADIMEC-4020m.Sample to be tested is zinc selenide
It (ZnSe), is two-photon absorption optical nonlinearity at 515nm.The ladder height h of time delays reflecting mirror is 10 μm, the time point
Resolution is 67fs, and ladder width W is 100 μm.
Specific detecting step are as follows: (1) do not place sample to be tested 11, image acquiring sensor 12 receives the light of detection light
Spot is linear reference hot spot, and attached drawing 3 is linear beam spot figure when not placing sample to be tested；
(2) sample is placed in detection optical path, image acquiring sensor receives the hot spot of detection light, is nonlinear optical
Spot；Fig. 4 is the non-linear hot spot figure placed after sample to be tested；(3) linear image in step (1) is handled, by image
Hot spot on middle same curves is converted into the linearity curve of not sample to be tested by image processing software, then will be in step (2)
Hot spot handled by identical method, obtain the nonlinear curve of sample to be tested.By the nonlinear curve of sample to be tested
Linearity curve when divided by no sample obtains material time and differentiates pump probe curve after being normalized；Fig. 5 is by image
Handle the normalization time resolution pump probe curve obtained.
For the experimental and theoretical computation of ZnSe nonlinear measurement, detailed process is as follows:
It is very weak due to comparing detection light energy with pump light, so the two-photon absorption of pump light is produced as free carrier
Raw unique channel, rate may be expressed as:
I in formulaeFor the light intensity at pump light sample, τrFor the free carrier service life.System is absorbed caused by free carrier
Several changes is proportional to excess carriers concentration, can be expressed as:
Δαf=σαΔN(t) (2)
σ in formulaαFor free-carrier Absorption section.In view of the knot of bound electron effect and free carrier joint effect
It closes, it is approximate using thin sample and slow change amplitude, light and pump light are detected in the propagation formula of ZnSe crystals are as follows:
I in formulapIndicate the light intensity of detection light.It can use formula combination pump probe experimental data, directly determine
Optical nonlinearity mechanism inside ZnSe accurately obtains corresponding optical physics parameter.
The utility model discloses a kind of ultrashort one pulse times to differentiate pump probe instrument, the laser that laser output is come
It is divided into pump light and detection light, pump light is non-linear by being allowed to generate on lens focus to nonlinear sample；Light is detected to pass through
The variation generated by pumping photoinduction nonlinear sample is detected after the reflection of one time delays reflecting mirror, is connect by image acquiring sensor
Receive image.In the case where the detection light Jing Guo different time delays, the variation reflection for the detection luminous intensity being emitted from sample
The case where particle's occupancy in different moments sample, so that it is determined that the absorption cross-section of each energy level and service life.It is practical by this
The measuring system of novel method work measures very convenient, the not movement of sample, it is only necessary to which a laser pulse can obtain
Time resolution pump probe curve is obtained, it is very simple compared with traditional pump probe optical path to test optical path.Without in conventional light path
High-precision mobile platform realizes time delay, it is only necessary to which a time delays reflecting mirror can realize time delay.
The technical program unspecified part belongs to technology well known to those skilled in the art.
Claims (1)
1. a kind of ultrashort one pulse time differentiates pump probe instrument, including laser, delay reflecting mirror, beam splitter, detection optical path
With pumping optical path, image acquiring sensor；The delay reflecting mirror is made of one group of stair-stepping reflecting surface；The laser
The light that device issues is divided into the detection optical path and pumping optical path after the beam splitter；The pumping optical path focus on to
In sample, detection optical path is incident to after the delay reflecting mirror by the stair-stepping reflective surface to described to test sample
Product, image acquiring sensor are placed on sample to be tested and nearby receive the light spot image being emitted from sample.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111638192A (en) * | 2020-06-08 | 2020-09-08 | 南京大学 | Tunable pumping-detection system based on super-continuum spectrum light source |
| CN113094959A (en) * | 2021-04-20 | 2021-07-09 | 天津大学 | Nonlinear response regulation and control method based on constraint state of continuous domain of ultrastructural surface |
-
2018
- 2018-09-25 CN CN201821560051.XU patent/CN208888136U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111638192A (en) * | 2020-06-08 | 2020-09-08 | 南京大学 | Tunable pumping-detection system based on super-continuum spectrum light source |
| CN113094959A (en) * | 2021-04-20 | 2021-07-09 | 天津大学 | Nonlinear response regulation and control method based on constraint state of continuous domain of ultrastructural surface |
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