CN106248636B - A method of measurement material nonlinearity absorption curve - Google Patents
A method of measurement material nonlinearity absorption curve Download PDFInfo
- Publication number
- CN106248636B CN106248636B CN201610581593.4A CN201610581593A CN106248636B CN 106248636 B CN106248636 B CN 106248636B CN 201610581593 A CN201610581593 A CN 201610581593A CN 106248636 B CN106248636 B CN 106248636B
- Authority
- CN
- China
- Prior art keywords
- laser
- hot spot
- ccd camera
- absorption curve
- scientific grade
- 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
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 65
- 239000000463 material Substances 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000005259 measurement Methods 0.000 title claims abstract description 36
- 239000013078 crystal Substances 0.000 claims abstract description 29
- 230000005540 biological transmission Effects 0.000 claims description 8
- 230000003287 optical effect Effects 0.000 claims description 8
- 238000013016 damping Methods 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 210000001367 artery Anatomy 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 239000005350 fused silica glass Substances 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- 238000002310 reflectometry Methods 0.000 claims description 4
- 210000003462 vein Anatomy 0.000 claims description 4
- 238000012935 Averaging Methods 0.000 claims description 3
- 230000008033 biological extinction Effects 0.000 claims description 3
- 230000009022 nonlinear effect Effects 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims 1
- 229920006395 saturated elastomer Polymers 0.000 description 6
- 230000004044 response Effects 0.000 description 4
- 238000011160 research Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 230000031700 light absorption Effects 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 238000009738 saturating Methods 0.000 description 2
- YZCKVEUIGOORGS-OUBTZVSYSA-N Deuterium Chemical compound [2H] YZCKVEUIGOORGS-OUBTZVSYSA-N 0.000 description 1
- 201000009310 astigmatism Diseases 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 229910052805 deuterium Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/59—Transmissivity
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
- G01N2201/068—Optics, miscellaneous
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention discloses a kind of methods for measuring material nonlinearity absorption curve, the method obtains required Single wavelength laser using crystal double frequency system and dispersing prism, then incident laser intensity is improved by long focus lens, using the energy and spot size of scientific grade CCD camera record incident laser, shoot laser energy is measured by energy meter, obtains the non-linear absorption curve of sample to be tested.The method of measurement material nonlinearity absorption curve of the invention improves the measurement range of non-linear absorption curve, simplifies non-linear absorption curve measurement system, realizes multi-wavelength, wide scope, the measurement of high precision nonlinear absorption curve.
Description
Technical field
The invention belongs to light lasers and matter interaction field, and in particular to a kind of measurement material nonlinearity absorption curve
Method.
Background technique
When light passes through material, the interactions such as atom, electronics in light and material cause the absorption of light；In low light condition
The absorption coefficient of lower material be constant, at this time be absorbed as linear absorption；The absorption of material becomes with laser intensity when strong light irradiation
Change, shows non-linear absorption properties: the phenomenon that absorption coefficient reduces with the increase of incident intensity referred to as saturated absorption；It absorbs
It is anti-saturated absorption that coefficient is increased with the increase of incident intensity.The non-linear absorption of material plays important in light laser
Laser pulse compression may be implemented using the saturated absorption characteristic of material in role, can be with using the anti-saturated absorption characteristic of material
Make the optical devices such as optical Limiting.However, the non-linear absorption of material is the key that cause damage in high power laser system
Link becomes the main bottleneck for restricting high power laser system energy lift.Therefore, the non-linear absorption properties tool of research material
The non-linear absorption curve for being of great significance, and accurately measuring material is basis and the key of research.
The non-linear absorption of material is attributed to the Multiphoton Absorbtion of material more, the non-linear absorption of material and incidence wave with
It closes, when non-linear absorption of research material need to measure non-linear absorption curve when different wave length incidence.When laser passes through material,
Material can cause the variation of its transmitance to the absorption of light, and the transmitance of material can characterize material with the variation of incident laser intensity
The non-linear absorption of material.The non-linear absorption curve of measurement material generallys use Z- scanning technique, and Z- scanning technique uses lens
It focuses and obtains the laser that intensity changes along Z-direction, obtain its non-linear absorption curve in the position of Z-direction by changing sample, Z- is swept
The requirement when technology of retouching reduces measurement non-linear absorption curve to laser output energy, but the method is smaller suitable for thickness
Sample, and the position of sample laser light incident crystal when Z-direction is mobile also will variation, inevitably introduce measurement error.With
The development of high power laser light technology, Transmissivity measurement method be also widely applied, Transmissivity measurement method is by sample to be tested position
Fixation is set, the transmittance curve of material is measured by the way that incident laser intensity is continuously improved, is reflected using the variation of material transmitance
Its non-linear absorption properties, this method is to thickness of sample without stringent limitation, and sample position is fixed when measurement, and error is smaller.Measurement
Beam-splitter is usually utilized to obtain the incident laser of small percentage and detect using energy meter, energy when the non-linear absorption curve of material
Meter has certain response lag, and energy meter is difficult to respond when low-energy laser incidence, and which limits non-linear absorption curves
Measurement range, and also need independent measurement incident laser spot size, increase the complexity of measuring device.
Currently, needing to improve nonlinear transmission mensuration, measurement range is improved, simplifies measuring system.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of methods for measuring material nonlinearity absorption curve.
The method of measurement material nonlinearity absorption curve of the invention, its main feature is that, which absorbs bent
The measuring device that the method for line uses includes pulse laser, crystal double frequency system, dispersing prism, long focus lens, diaphragm, light splitting
Plate I, beam-splitter II, attenuator, scientific grade CCD camera, sample to be tested and energy meter, pulse laser emission pulse laser lead to
It crosses crystal double frequency system and injects dispersing prism, obtain Single wavelength laser, Single wavelength laser forms poly- after long focus lens and diaphragm
Burnt laser focuses laser light incident to beam-splitter I, and the reflection laser I of beam-splitter I is reflected into reflection laser II through beam-splitter II, instead
It penetrates laser II to attenuator and transmits reflection laser III, reflection laser III enters scientific grade CCD camera；The transmission of beam-splitter I swashs
Light I becomes transmission laser II through sample to be tested and enters energy meter；
Ratio between the focal length f of the long focus lens, the thickness h of sample to be tested and the spot diameter d of Single wavelength laser
For f/h >=100, f/d >=100；The sample to be tested is to the ratio between the distance L of focal length lens focus and the thickness h of sample to be tested
For L/h >=30；The fold line distance of the photosurface of the scientific grade CCD camera to long focus lens is s, s=f-L；
The measuring process of the method for the measurement material nonlinearity absorption curve is as follows:
1a. pulse laser emission pulse laser adjusts the matching angle of the KDP crystalloid in crystal double frequency system, directly
Frequency-doubling conversion efficiency to pulse laser reaches maximum value；
1b. determines the extinction efficiency of attenuator；
1c. removes sample to be tested, and from low to high, series n, n >=10 adjust the pulse that pulse laser emits step by step and swash
Light energy records hot spot P of the reflection laser III in scientific grade CCD camera10Hot spot P1nIntensity profile, while recording energy
The reading E of meterin(P10)-Ein(P1n)；
1d. places sample to be tested, and from low to high, series n, n >=10 adjust the pulse that pulse laser emits step by step and swash
Light energy records hot spot P of the reflection laser III in scientific grade CCD camera20Hot spot P2nIntensity profile, while recording energy
The reading E of meterout(P20)-Eout(P2n)；
1e. draws the gray scale of each point and the relation curve G (X, Y) of position on hot spot according to the grayscale distribution information of hot spot,
Hot spot gray scale G is calculated according to the curvesWith facula area S, hot spot P is obtained10Hot spot P1nCorresponding Gs(P10)-Gs(P1n) and S
(P10)-S(P1n), hot spot P20Hot spot P2nCorresponding Gs(P20)-Gs(P2n) and S (P20)-S(P2n)；
1f. is by the E of step 1cin(P10)-Ein(P1n) and step 1e Gs(P10)-Gs(P1n) correspond, it is quasi- by curve
It closes and obtains Ein(GA)；
1g. utilizes Ein(GA) relationship calculate sample to be tested (10) Gs(P20)-Gs(P2n) corresponding Ein(P20)-Ein(P2n)；
1h. passes through T=Ein/EoutThe transmitance for calculating sample to be tested (10), obtains T (P20)-T(P2n)；
1i. passes through Iin= Ein/ (τ S) calculates laser intensity, and τ is the pulsewidth of laser, obtains Iin(P20)- Iin(P2n)；
1j. is by the T (P of step 1h20)-T(P2n) and step 1i Iin(P20)- Iin(P2n) correspond, it is quasi- by curve
It closes and obtains T (Iin)。
The step 1b the following steps are included:
Attenuator is multi-disc when the pulsed laser energy of 2a. pulse laser transmitting is minimum, by scientific grade CCD camera
The gray scale of hot spot is observed, hot spot gray value is lower than the saturation gray scale of scientific grade CCD camera；
The pulsed laser energy of pulse laser transmitting is gradually increased until maximum in 2b., and the quantity of attenuator is constant, passes through
Scientific grade CCD camera observes the gray scale of hot spot, and hot spot gray value is lower than the saturation gray scale of scientific grade CCD camera；
2c. reduces the quantity of attenuator piecewise, and the variation of the gray scale of hot spot is observed by scientific grade CCD camera, until section
Hot spot gray value in classes and grades in school CCD camera is the 65%-95% of the saturation gray scale of scientific grade CCD camera, hot spot gray value at this time
For gray scale maximum value.
The step 1e the following steps are included:
A fixed scope of statistics is chosen when 3a. calculates hot spot gray scale around hot spot, hot spot is located at the range center, unites
Meter range area is 2-5 times of facula area, hot spot gray scale QUOTE
, G0For image background signal；
When 3b.G (X, Y) is distributed rectangular curve, the area of the distributed rectangular curve is the area S of hot spot；G(X,
Y) be Gaussian Profile when, by nonlinear effect linear averaging caused by Gaussian beam, the equivalent area QUOTE of hot spot , GpFor the peak gray of hot spot.
The pulsewidth of the pulse laser of the described pulse laser transmitting is picosecond or nanosecond order, the wavelength of pulse laser are
1053 nm or 1064 nm.
The crystal double frequency system includes the KDP crystalloid of a piece of above arranged in series.
The device of the measurement material nonlinearity absorption curve is placed on the damping optical platform in darkroom, Scientific Grade
Without interference of stray light around CCD camera.
The material of the beam-splitter I and beam-splitter II is fused silica, reflectivity 4%.
Two frequencys multiplication, frequency tripling, quadruple and the fifth harmonic laser that the crystal double frequency system can be realized fundamental frequency light are defeated
Out, and by dispersing prism the Single wavelength laser of different wave length is chosen.
Ratio f/d >=100 between the focal length f and spot diameter d of the long focus lens, can reduce thickness of sample and cause
Sample front and rear surfaces spot size difference absolute value.
After the diaphragm is placed in long focus lens, the shape and bore of Single wavelength laser facula are controlled by diaphragm, it can
Laser is more uniformly focused to obtain shape more rule, gray scale.
The sample to be tested has certain transmitance to incident laser, and sample to be tested to focal length lens focus away from
The ratio between thickness h from L and sample to be tested is L/h >=30, can reduce sample front and rear surfaces spot size caused by thickness of sample
The relative value of difference.
The scientific grade CCD camera has lower response lag and wider response wave band, utilizes scientific grade CCD phase
The energy and hot spot of machine testing reflection laser III, s=f-L make the hot spot ruler of reflection laser III on scientific grade CCD camera photosurface
It is very little equal with the spot size of transmission laser I on sample to be tested.
The two-stage light splitting of beam-splitter I, beam-splitter II that the method for measurement material nonlinearity absorption curve of the invention uses
Plate samples, while the attenuator of appropriate attenuation multiplying power is placed before scientific grade CCD camera, guarantees incident pulsed laser energy most
When big, the maximum value for the hot spot gray scale that scientific grade CCD camera obtains is the 65%-95% that scientific grade CCD camera is saturated gray scale.
The measuring device that the method for measurement material nonlinearity absorption curve of the invention uses is placed in damping light in darkroom
It learns on platform, around without interference of stray light.
The method of measurement material nonlinearity absorption curve of the invention has the advantages that
1. using KDP crystalloid by fundamental frequency optical sccond-harmonic generation, and required Single wavelength laser is sorted out using dispersing prism, it can
Realize the non-linear absorption curve of the Single wavelength laser measurement material using multi-wavelength；
2. scientific grade CCD camera has lower response lag and higher saturation gray scale, scientific grade CCD camera is utilized
Single wavelength laser energy is detected, the non-linear absorption curve of material can be measured within the scope of wider Single wavelength laser intensity；
It, can be accurate according to this distribution 3. the spot intensity for being detected incident laser simultaneously using scientific grade CCD camera is distributed
The size for obtaining hot spot, simplifies measuring device, improves measurement accuracy.
The method of measurement material nonlinearity absorption curve of the invention obtains institute using crystal double frequency system and dispersing prism
Then the Single wavelength laser needed improves incident laser intensity by long focus lens, record incident laser using scientific grade CCD camera
Energy and spot size, shoot laser energy is measured by energy meter, obtains the non-linear absorption curve of sample to be tested.This
The method of the measurement material nonlinearity absorption curve of invention improves the measurement range of non-linear absorption curve, simplifies non-linear
Absorption curve measuring system realizes multi-wavelength, wide scope, the measurement of high precision nonlinear absorption curve.
Detailed description of the invention
Fig. 1 is the measuring device schematic diagram of the method for measurement material nonlinearity absorption curve of the invention；
In figure, 1. pulse lasers, 2. crystal double frequency systems, 3. dispersing prisms, 4. long focus lens, 5. diaphragms, 6. light splitting
Plate I, 7. beam-splitters II, 8. attenuators, 9. scientific grade CCD cameras, 10. samples to be tested, 11. energy meters.
Specific embodiment
Below with reference to embodiment and attached drawing, the present invention will be further described.Following embodiment is merely to illustrate the present invention,
And not limitation of the present invention, related person skilled in the art without departing from the spirit and scope of the present invention, go back
It can make a variety of changes, replacement and variant, therefore same technical solution also belongs to scope of the invention.
The method of measurement material nonlinearity absorption curve of the invention, the method for the measurement material nonlinearity absorption curve are adopted
Measuring device is as shown in Figure 1, include pulse laser 1, crystal double frequency system 2, dispersing prism 3, long focus lens 4, diaphragm
5, beam-splitter I 6, beam-splitter II 7, attenuator 8, scientific grade CCD camera 9, sample to be tested 10 and energy meter 11, pulse laser 1
Emission pulse laser injects dispersing prism 3 by crystal double frequency system 2, obtains Single wavelength laser, and Single wavelength laser is saturating through focal length
It is formed after mirror 4 and diaphragm 5 and focuses laser, focus laser light incident to beam-splitter I 6, the reflection laser I of beam-splitter I 6 is through beam-splitter II
7 are reflected into reflection laser II, and reflection laser II to attenuator 8 transmits reflection laser III, and reflection laser III enters scientific grade CCD
Camera 9；The transmission laser I of beam-splitter I 6 becomes transmission laser II through sample to be tested 10 and enters energy meter 11；
Compare between the focal length f of the long focus lens 4, the thickness h of sample to be tested 10 and the spot diameter d of Single wavelength laser
Example is f/h >=100, f/d >=100；The sample to be tested 10 arrives the distance L of long 4 focus of focus lens and the thickness of sample to be tested 10
Spending the ratio between h is L/h >=30；The fold line distance of the photosurface of the scientific grade CCD camera 9 to long focus lens 4 is s, s=f-L；
The measuring process of the method for the measurement material nonlinearity absorption curve is as follows:
1 emission pulse laser of 1a. pulse laser adjusts the matching angle of the KDP crystalloid in crystal double frequency system 2,
Until the frequency-doubling conversion efficiency of pulse laser reaches maximum value；
1b. determines the extinction efficiency of attenuator 8；
1c. removes sample to be tested 10, and from low to high, series n, n >=10 adjust the arteries and veins that pulse laser 1 emits step by step
Impulse light energy records hot spot P of the reflection laser III in scientific grade CCD camera 910Hot spot P1nIntensity profile, remember simultaneously
Record the reading E of energy meter 11in(P10)-Ein(P1n)；
1d. places sample to be tested 10, and from low to high, series n, n >=10 adjust the arteries and veins that pulse laser 1 emits step by step
Impulse light energy records hot spot P of the reflection laser III in scientific grade CCD camera 920Hot spot P2nIntensity profile, remember simultaneously
Record the reading E of energy meter 11out(P20)-Eout(P2n)；
1e. draws the gray scale of each point and the relation curve G (X, Y) of position on hot spot according to the grayscale distribution information of hot spot,
Hot spot gray scale G is calculated according to the curvesWith facula area S, hot spot P is obtained10Hot spot P1nCorresponding Gs(P10)-Gs(P1n) and S
(P10)-S(P1n), hot spot P20Hot spot P2nCorresponding Gs(P20)-Gs(P2n) and S (P20)-S(P2n)；
1f. is by the E of step 1cin(P10)-Ein(P1n) and step 1e Gs(P10)-Gs(P1n) correspond, it is quasi- by curve
It closes and obtains Ein(GA)；
1g. utilizes Ein(GA) calculate sample to be tested (10) Gs(P20)-Gs(P2n) corresponding Ein(P20)-Ein(P2n)；
1h. passes through T=Ein/EoutThe transmitance for calculating sample to be tested 10, obtains T (P20)-T(P2n)；
1i. passes through Iin= Ein/ (τ S) calculates laser, and τ is the pulsewidth of laser, obtains Iin(P20)- Iin(P2n)；
1j. is by the T (P of step 1h20)-T(P2n) and step 1i Iin(P20)- Iin(P2n) correspond, it is quasi- by curve
It closes and obtains T (Iin)。
The step 1b the following steps are included:
Attenuator 8 is multi-disc when the pulsed laser energy that 2a. pulse laser 1 emits is minimum, passes through scientific grade CCD camera
The gray scale of hot spot is observed on 9, hot spot gray value is lower than the saturation gray scale of scientific grade CCD camera 9；
The pulsed laser energy of the transmitting of pulse laser 1 is gradually increased until maximum in 2b., and the quantity of attenuator 8 is constant, leads to
The gray scale that scientific grade CCD camera 9 observes hot spot is crossed, hot spot gray value is lower than the saturation gray scale of scientific grade CCD camera 9；
2c. reduces the quantity of attenuator 8 piecewise, and the variation of the gray scale of hot spot is observed by scientific grade CCD camera 9, until
Hot spot gray value in scientific grade CCD camera 9 is the 65%-95% of the saturation gray scale of scientific grade CCD camera 9, hot spot ash at this time
Angle value is gray scale maximum value.
The step 1e the following steps are included:
3a. chooses a fixed scope of statistics when calculating hot spot gray scale, hot spot is in the range center, scope of statistics area
It is 2-5 times of facula area, hot spot gray scale QUOTE , G0For figure
As background signal；
When 3b.G (X, Y) is distributed rectangular curve, the area of the distributed rectangular curve is the area S of hot spot；G(X,
Y) be Gaussian Profile when, by nonlinear effect linear averaging caused by Gaussian beam, the area QUOTE of hot spot , GpFor the peak gray of hot spot.
The pulsewidth for the pulse laser that the pulse laser 1 emits is picosecond or nanosecond order the wavelength of pulse laser
For 1053 nm or 1064 nm.
The crystal double frequency system 2 includes the KDP crystalloid of a piece of above arranged in series.
The device of the measurement material nonlinearity absorption curve is placed on the damping optical platform in darkroom, Scientific Grade
Without interference of stray light around CCD camera 9.
The material of the beam-splitter I 6 and beam-splitter II 7 is fused silica, reflectivity 4%.
Embodiment 1
Pulse laser gain media is Nd:YLF, exports fundamental frequency lightω 1=1053 nm, pulsewidth τ=50 ps, fundamental frequency hot spot
Diameter 0.7cm, shoot laser horizontal polarization；Crystal double frequency system is made of KDP and DKDP crystal, is obtained after being frequency convertedω 2The quadruple frequency light of=263 nm；Dispersing prism and long focus lens are the ultraviolet saturating element of height, and the focal length f of long focus lens is about
130 cm；The material of beam-splitter is fused silica, reflectivity 4%；Sample to be tested is the DKDP crystal that deuterium content is 66%, and sample is thick
Degree h is 0.8 cm, and sample surfaces are finely polished；The resolution ratio of scientific grade CCD camera is 1024 pixels × 1024 pixels, single
A pixel is having a size of 13 μm of 13 μ m；Attenuator is laser of quadruple attenuator；The measurement range of energy meter is 20 μ J-
10 J；Scientific grade CCD camera and sample to be tested are placed in can be along the translation stage that optical path translates, and scientific grade CCD camera is photosensitive
Face and sample to be tested to lens distance s be 103 cm；Entire measuring system is placed in darkroom on damping optical platform, around without miscellaneous
Astigmatism interference.
The measuring process of the method for the measurement material nonlinearity absorption curve is as follows:
1. pulse laser emission pulse laser adjusts the matching angle of KDP and DKDP crystal in crystal double frequency system, directly
Frequency-doubling conversion efficiency to pulse laser reaches maximum value；
2. the pulsed laser energy of pulse laser transmitting is minimum, multi-disc attenuator is added before CCD camera, passes through science
The gray scale of grade CCD camera observation hot spot, hot spot gray value are lower than the saturation gray scale of scientific grade CCD camera；Pulse is gradually increased to swash
For the pulsed laser energy of light device transmitting until maximum, the quantity of attenuator is constant, and the ash of hot spot is observed by scientific grade CCD camera
Degree, hot spot gray value are lower than the saturation gray scale of scientific grade CCD camera；The quantity for reducing attenuator piecewise, passes through scientific grade CCD phase
The variation of the gray scale of hot spot is observed on machine, until the hot spot gray value in scientific grade CCD camera is the saturation of scientific grade CCD camera
The 71% of gray scale.
3. removing sample to be tested, from low to high, series 12 adjusts the pulse laser of pulse laser (1) transmitting step by step
Energy records hot spot P of the reflection laser III in scientific grade CCD camera10Hot spot P1nIntensity profile, while recording energy meter
Reading Ein(P10)-Ein(P1n)；
4. placing sample to be tested, from low to high, series 12 adjusts the pulse laser energy of pulse laser transmitting step by step
Amount records hot spot P of the reflection laser III in scientific grade CCD camera20Hot spot P2nIntensity profile, while recording energy meter
Read Eout(P20)-Eout(P2n)；
5. drawing the gray scale of each point and the relation curve G (X, Y) of position on hot spot, G (X, Y) is Gaussian Profile, hot spot half
High wide about 20 pixels, the peak gray of hot spot is Gp, background signal G0；100 pixels × 100 pixels are chosen around hot spot
Range, calculating hot spot gray scale QUOTEQUOTE in the range ；
The equivalent facula area QUOTE of Gaussian beam ；It is final to obtain hot spot P10Hot spot
P1nCorresponding S (P10)-S(P1n) and Gs(P10)-Gs(P1n), hot spot P20Hot spot P2nCorresponding S (P20)-S(P2n) and Gs(P20)-
Gs(P2n)；
6. by the E of step 3in(P10)-Ein(P1n) and step 5 Gs(P10)-Gs(P1n) correspond, hot spot mean value gray scale
It is in a linear relationship with incident laser energy approximation, in order to obtain more accurate Ein(GA) relationship, using second order polynomial fit number
According to；
7. utilizing Ein(GA) relationship calculate sample to be tested Gs(P20)-Gs(P2n) corresponding Ein(P20)-Ein(P2n)；
8. passing through T=Ein/EoutThe transmitance for calculating sample to be tested, obtains T (P20)-T(P2n)；
9. passing through Iin= Ein/ (τ S) calculates laser intensity, obtains Iin(P20)- Iin(P2n)；
10. by the T (P of step 820)-T(P2n) and step 9 Iin(P20)- Iin(P2n) correspond, it is quasi- by multinomial
It closes and obtains T (Iin)。
The result shows that with the increase of laser intensity, the transmitance of DKDP crystal is in non-linear decline, and fall off rate by
It is decrescence small；Laser intensity is greater than 10 GW/cm2When, transmitance gradually tends to definite value.
Embodiment 2
The present embodiment and the embodiment of embodiment 1 are essentially identical, and the main distinction is, crystal double frequency system is two pieces
KDP crystal generatesω 2The frequency tripling light of=351 nm；The focal length of long focus lens is about 140 cm, scientific grade CCD camera photosurface
Distance with sample to be tested to lens is 104 cm；Attenuator is frequency tripled laser attenuator, the hot spot in scientific grade CCD camera
Gray scale maximum value is saturated the 87% of gray scale for it.The result shows that the transmitance of DKDP crystal is in non-with the increase of laser intensity
Linear decline, the non-linear absorption of DKDP crystal significantly reduces under 351 nm laser irradiations compared with the result in embodiment 1.
Embodiment 3
The present embodiment and the embodiment of embodiment 1 are essentially identical, and the main distinction is, pulse laser gain media is
Nd:YAG exports fundamental frequency lightω 1=1064 nm；Crystal double frequency system is KDP and DKDP crystal, the cutting of KDP and DKDP crystal
Angle pin generates 1064 nm laserω 2The quadruple frequency light of=266 nm.
Claims (7)
1. a kind of method for measuring material nonlinearity absorption curve, which is characterized in that the measurement material nonlinearity absorption curve
Method use measuring device include pulse laser (1), crystal double frequency system (2), dispersing prism (3), long focus lens (4),
Diaphragm (5), beam-splitter I (6), beam-splitter II (7), attenuator (8), scientific grade CCD camera (9), sample to be tested (10) and energy
It counts (11), pulse laser (1) emission pulse laser, injects dispersing prism (3) by crystal double frequency system (2), obtain unicast
Long laser, Single wavelength laser is formed after long focus lens (4) and diaphragm (5) focuses laser, focuses laser light incident to beam-splitter I
(6), the reflection laser I of beam-splitter I (6) is reflected into reflection laser II, reflection laser II to attenuator (8) through beam-splitter II (7)
Reflection laser III is transmitted, reflection laser III enters scientific grade CCD camera (9)；The transmission laser I of beam-splitter I (6) is through to test sample
Product (10) become transmission laser II and enter energy meter (11)；
Compare between the focal length f of the long focus lens (4), the thickness h of sample to be tested (10) and the spot diameter d of Single wavelength laser
Example is f/h >=100, f/d >=100；The sample to be tested (10) arrives the distance L and sample to be tested of long focus lens (4) focus
(10) the ratio between thickness h is L/h >=30；The photosurface of the scientific grade CCD camera (9) to long focus lens (4) broken line away from
From for s, s=f-L；
The measuring process of the method for the measurement material nonlinearity absorption curve is as follows:
1a. pulse laser (1) emission pulse laser adjusts the matching angle of the KDP crystalloid in crystal double frequency system (2),
Until the frequency-doubling conversion efficiency of pulse laser reaches maximum value；
1b. determines the extinction efficiency of attenuator (8)；
1c. removes sample to be tested (10), and from low to high, series n, n >=10 adjust the arteries and veins of pulse laser (1) transmitting step by step
Impulse light energy records hot spot P of the reflection laser III on scientific grade CCD camera (9)10Hot spot P1nIntensity profile, simultaneously
Record the reading E of energy meter (11)in(P10)-Ein(P1n)；
1d. places sample to be tested (10), and from low to high, series n, n >=10 adjust the arteries and veins of pulse laser (1) transmitting step by step
Impulse light energy records hot spot P of the reflection laser III on scientific grade CCD camera (9)20Hot spot P2nIntensity profile, simultaneously
Record the reading E of energy meter (11)out(P20)-Eout(P2n)；
1e. draws the gray scale of each point and the relation curve G (X, Y) of position on hot spot according to the grayscale distribution information of hot spot, according to
The curve calculates hot spot gray scale GsWith facula area S, hot spot P is obtained10Hot spot P1nCorresponding Gs(P10)-Gs(P1n) and S (P10)-
S(P1n), hot spot P20Hot spot P2nCorresponding Gs(P20)-Gs(P2n) and S (P20)-S(P2n)；
1f. is by the E of step 1cin(P10)-Ein(P1n) and step 1e Gs(P10)-Gs(P1n) correspond, it is obtained by curve matching
Obtain Ein(GA)；
1g. utilizes Ein(GA) relationship calculate sample to be tested (10) Gs(P20)-Gs(P2n) corresponding Ein(P20)-Ein(P2n)；
1h. passes through T=Ein/EoutThe transmitance for calculating sample to be tested (10), obtains T (P20)-T(P2n)；
1i. passes through Iin= Ein/ (τ S) calculates laser intensity, and τ is the pulsewidth of laser, obtains Iin(P20)- Iin(P2n)；
1j. is by the T (P of step 1h20)-T(P2n) and step 1i Iin(P20)- Iin(P2n) correspond, it is obtained by curve matching
Obtain T (Iin)。
2. a kind of method for measuring material nonlinearity absorption curve according to claim 1, which is characterized in that the step
Rapid 1b the following steps are included:
Attenuator (8) is multi-disc when the pulsed laser energy of 2a. pulse laser (1) transmitting is minimum, passes through scientific grade CCD camera
(9) gray scale of hot spot is observed, hot spot gray value is lower than the saturation gray scale of scientific grade CCD camera (9)；
The pulsed laser energy of pulse laser (1) transmitting is gradually increased until maximum in 2b., and the quantity of attenuator (8) is constant, leads to
The gray scale of scientific grade CCD camera (9) observation hot spot is crossed, hot spot gray value is lower than the saturation gray scale of scientific grade CCD camera (9)；
2c. reduces the quantity of attenuator (8) piecewise, and the variation of the gray scale of hot spot is observed by scientific grade CCD camera (9), until
Hot spot gray value in scientific grade CCD camera (9) is the 65%-95% of the saturation gray scale of scientific grade CCD camera (9), light at this time
Spot gray value is gray scale maximum value.
3. a kind of method for measuring material nonlinearity absorption curve according to claim 1, which is characterized in that the step
Rapid 1e the following steps are included:
3a. chooses a fixed scope of statistics when calculating hot spot gray scale, hot spot is in the range center, and scope of statistics area is light
2-5 times of spot area, hot spot gray scale, G0For image background signal；
When 3b.G (X, Y) is distributed rectangular curve, the area of the distributed rectangular curve is the area S of hot spot；G(X, Y)
When for Gaussian Profile, by nonlinear effect linear averaging caused by Gaussian beam, the equivalent area of hot spot,
GpFor the peak gray of hot spot.
4. a kind of method for measuring material nonlinearity absorption curve according to claim 1, it is characterised in that: the pulse
The pulsewidth of the pulse laser of laser (1) transmitting is picosecond or nanosecond order, the wavelength of pulse laser are 1053 nm or 1064
nm。
5. a kind of method for measuring material nonlinearity absorption curve according to claim 1, it is characterised in that: the crystalline substance
Body frequency doubling system (2) includes the KDP crystalloid of a piece of above arranged in series.
6. a kind of method for measuring material nonlinearity absorption curve according to claim 1, it is characterised in that: the survey
The device of amount material nonlinearity absorption curve is placed on the damping optical platform in darkroom, around scientific grade CCD camera (9)
Without interference of stray light.
7. a kind of method for measuring material nonlinearity absorption curve according to claim 1, it is characterised in that: point
The material of tabula rasa I (6) and beam-splitter II (7) is fused silica, reflectivity 4%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610581593.4A CN106248636B (en) | 2016-07-22 | 2016-07-22 | A method of measurement material nonlinearity absorption curve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610581593.4A CN106248636B (en) | 2016-07-22 | 2016-07-22 | A method of measurement material nonlinearity absorption curve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106248636A CN106248636A (en) | 2016-12-21 |
| CN106248636B true CN106248636B (en) | 2019-03-08 |
Family
ID=57604380
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610581593.4A Active CN106248636B (en) | 2016-07-22 | 2016-07-22 | A method of measurement material nonlinearity absorption curve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106248636B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106872415A (en) * | 2017-01-23 | 2017-06-20 | 中国科学院上海光学精密机械研究所 | With reference to the measurement apparatus and measuring method of the multi-wavelength sample optical limiting properties of micro-imaging |
| CN108107020B (en) * | 2018-02-07 | 2023-09-19 | 中国工程物理研究院激光聚变研究中心 | Device and method for measuring nonlinear refractive index coefficient of material |
| CN108519356A (en) * | 2018-05-09 | 2018-09-11 | 宁波纳智微光电科技有限公司 | A kind of vehicle glass transmittance and reflectance detection of mix format apparatus and method |
| CN108572061B (en) * | 2018-07-23 | 2023-10-13 | 中国工程物理研究院激光聚变研究中心 | Full-caliber harmonic conversion efficiency measuring system and measuring method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0645616A1 (en) * | 1992-12-25 | 1995-03-29 | DRACHEV, Vladimir Prokopievich | Dispersion interferometer |
| CN101477047A (en) * | 2009-01-07 | 2009-07-08 | 苏州大学 | Nonlinear absorption measuring method based on lens geometric optical imaging |
| CN101609001A (en) * | 2009-07-01 | 2009-12-23 | 苏州大学 | A Method for Measuring Material Nonlinearity Based on Single Pulse Reflection of Phase Object |
| CN201503386U (en) * | 2009-07-10 | 2010-06-09 | 安徽师范大学 | A device for measuring nonlinear coefficient of irradiated samples |
| CN105092477A (en) * | 2015-08-26 | 2015-11-25 | 中国工程物理研究院激光聚变研究中心 | Optical nonlinearity measuring device and measuring method for nonlinearity thick photonics materials |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7813016B2 (en) * | 2006-11-21 | 2010-10-12 | California Institute Of Technology | Method of nonlinear harmonic holography |
-
2016
- 2016-07-22 CN CN201610581593.4A patent/CN106248636B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0645616A1 (en) * | 1992-12-25 | 1995-03-29 | DRACHEV, Vladimir Prokopievich | Dispersion interferometer |
| CN101477047A (en) * | 2009-01-07 | 2009-07-08 | 苏州大学 | Nonlinear absorption measuring method based on lens geometric optical imaging |
| CN101609001A (en) * | 2009-07-01 | 2009-12-23 | 苏州大学 | A Method for Measuring Material Nonlinearity Based on Single Pulse Reflection of Phase Object |
| CN201503386U (en) * | 2009-07-10 | 2010-06-09 | 安徽师范大学 | A device for measuring nonlinear coefficient of irradiated samples |
| CN105092477A (en) * | 2015-08-26 | 2015-11-25 | 中国工程物理研究院激光聚变研究中心 | Optical nonlinearity measuring device and measuring method for nonlinearity thick photonics materials |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106248636A (en) | 2016-12-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11143558B2 (en) | Method and system for measuring transient time width of ultrashort pulse | |
| CN102393383B (en) | ArF laser film element irradiation damage test device with high irradiation density uniformity | |
| CN106248636B (en) | A method of measurement material nonlinearity absorption curve | |
| CN201072406Y (en) | Pump detecting device based on 4f phase coherent imaging | |
| JP5628256B2 (en) | Flash photolysis system | |
| CN101261224B (en) | Method for Measuring Optical Nonlinearity of Materials Based on 4f Phase Coherent Imaging System | |
| CN112595493B (en) | A common target surface measurement device and method for laser damage threshold and nonlinear absorption | |
| CN103063315B (en) | Single signal-to-noise ratio measuring method and device based on chirp pulse characteristics | |
| CN106770311A (en) | A kind of crystal laser pretreatment and point-to-point damage measure device and method of testing | |
| CN111579221B (en) | Method and device for testing nonlinear effect I x L value of optical element | |
| US7817270B2 (en) | Nanosecond flash photolysis system | |
| CN110440918A (en) | A kind of high-resolution chevilled silk fluorescence spectrum imaging in space and localization method and system | |
| CN106198450B (en) | A kind of device measuring material nonlinearity absorption curve | |
| Steiger et al. | Fully automated z-scan setup based on a tunable fs-oscillator | |
| CN114486739A (en) | A z-scan measurement device and measurement method for measuring nonlinear optical coefficients | |
| CN204330141U (en) | A kind of apparatus for measuring high power ultra-short laser pulse contrast | |
| CN109211846A (en) | A kind of non-linear transmissivity test device | |
| CN102944313A (en) | Multifunctional femtosecond laser pulse measuring device | |
| Bouyer et al. | Nonlinear processes and laser damage induced by a temporally modulated nanosecond UV laser beam. Part II: Kerr self-focusing | |
| CN101324503A (en) | Pump-probe method based on Z-scan | |
| CN112268861A (en) | Dual-wavelength femtosecond pumping detection heat reflection system | |
| CN210775177U (en) | Device for adjusting laser beam energy in libs | |
| US12253785B2 (en) | Apparatus and method for measuring and controlling chirp of ultrafast laser pulse | |
| CN101226145A (en) | Nonlinear Refractive Properties Measurement Method Eliminating the Influence of Nonlinear Absorption | |
| CN116879242A (en) | Full-band polarization-adjustable nonlinear optical characteristic in-situ detection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |