CN110006874A - A kind of coaxial femtosecond time Correlated Coherent anti-Stokes Raman scattering test macro - Google Patents
A kind of coaxial femtosecond time Correlated Coherent anti-Stokes Raman scattering test macro Download PDFInfo
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- CN110006874A CN110006874A CN201910322121.0A CN201910322121A CN110006874A CN 110006874 A CN110006874 A CN 110006874A CN 201910322121 A CN201910322121 A CN 201910322121A CN 110006874 A CN110006874 A CN 110006874A
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Abstract
The present invention relates to a kind of coaxial femtosecond time Correlated Coherent anti-Stokes Ramans to scatter test macro, belongs to ultrafast femtosecond laser field.It mainly include femtosecond pulse generator, optical parametric oscillator, reflecting mirror, beam splitter, dichroscope, annulus light generating device, sample cell, photomultiplier tube signal reception device and computer.The invention has the advantages that structure novel, the reflecting mirror that script is used to adjust angle between laser pulse is reduced to 2 by 6, pass through the change of the circle diameter to circular femto-second laser pulse, to adjust the angle between femto-second laser pulse, script is needed to the time correlation coherent anti-stokes raman scattering technology of 6 femto-second laser pulses adjusting freedom degrees, it is optimized for only adjusting 3 adjusting freedom degrees of circle diameter of 2 reflecting mirrors and circular femto-second laser pulse, substantially increases the stability, adjustable ease for use and repeatability of system.
Description
Technical field
It is especially a kind of with good stability, adjustable ease for use the invention belongs to ultrafast femtosecond laser field, by
The femto-second laser pulse that the circular femto-second laser pulse of a branch of Wavelength tunable and a branch of wavelength are fixed is coaxial come the one kind realized
Femtosecond time Correlated Coherent anti-Stokes Raman scatters light test system.
Background technique
Time correlation coherent anti-stokes raman scattering technology is a kind of typical non-linear laser technology.Pass through change
The characteristic of laser pulse makes time correlation coherent anti-stokes raman scattering technology have a variety of evolution forms, can visit
Much information in sample ground state or excitation state.The development of nineteen sixties mid-term picosecond laser technology, 20 generation
The appearance and the commercialization easy to operate of the early 1990s of the collision mode-locked dyelaser of discipline the seventies subpicosecond grade
Self-locking mode is admired the succeeding in developing so that femtosecond laser technology is rapidly developed in different application field of sapphire laser.Its
In, by the time correlation coherent anti-stokes raman scattering technology using femtosecond laser multi-pulse pumping, it can get many
The important results such as structure of matter variation or energy conversion, people can have the substance and hair of the characteristics of luminescence using this technical research
Photoreduction process, the flame temperature detection of fuel and identification of intermediate product etc..
Realization for time correlation coherent anti-stokes raman scattering technology needs to utilize three beams femtosecond laser arteries and veins
Punching, wherein the wavelength of two beam femto-second laser pulses is identical, the wavelength and above-mentioned femtosecond of another beam femto-second laser pulse swash
Light pulse wavelength is different, this three beams femto-second laser pulse needs converge in the same point of detected sample, and enter between them
Relative angle when being mapped on sample needs to meet specific formula.This just needs to carry out the direction of three beams femto-second laser pulse
It is accurate to adjust, in order to meet to three beams femto-second laser pulse can be adjusted per a branch of laser pulse its shooting angle and position this
Experiment condition, each femto-second laser pulse require 2 reflecting mirrors of placement its angle to be adjusted, need 6 altogether
Reflecting mirror.This significantly increases the difficulty and complexity of experimental implementation, and the repeatability of experiment is also poor.(Wang Yinghui two
Ultrafast spectrum research [D] the Harbin Institute of Technology of the typical conjugatd polymers coherent vibrational process of kind, 2009.)
Summary of the invention
The present invention provides a kind of coaxial femtosecond time Correlated Coherent anti-Stokes Raman scattering test macro, to solve mesh
Preceding existing because structure is complicated, significantly increases the difficulty and complexity of experimental implementation, the repeatability of experiment is also poor
The problem of.
The technical solution adopted by the present invention is that: a branch of femtosecond pulse of femtosecond pulse generator generation, process
After reflecting mirror one, beam splitter, femtosecond pulse is divided into the identical femtosecond pulse one of two beam wavelength and femtosecond pulse swashs
Light two, wherein femtosecond pulse two enters optical parametric oscillator, the femtosecond pulse being emitted from optical parametric oscillator
Three wavelength can change, and realize the adjusting of the wavelength of femtosecond pulse three in a certain range, shake by optical parameter
The femtosecond pulse three for swinging device generation forms a branch of annulus shape femtosecond pulse and swashs after annulus light generating device
Light, the annulus shape femtosecond pulse are closed at dichroscope with the femtosecond pulse one after the reflection of reflecting mirror two
Beam, obtains that a branch of coaxial mixing femtosecond pulse, wherein femtosecond pulse one is located in circular femtosecond pulse
Between；The coaxial mixing femtosecond pulse converges at the sample among sample cell after convex lens one, this is total at this time
Sample among axis mixing femtosecond pulse and sample cell interacts, and generates a wavelength and converges on sample
The different signal pulse laser of coaxial mixing femtosecond pulse, making the pulse laser through sample includes the femtosecond of three kinds of wavelength
Pulse laser, annulus shape femtosecond pulse and signal pulse laser, the pulse laser comprising these three wavelength is by reflection
After mirror three, optical filter, signal pulse laser is retained, and signal pulse laser passes through three shrink beam of convex lens, by photomultiplier transit
Pipe reception device receives, and is recorded on the computer being connected with photomultiplier tube reception device.
The dichroscope reflects circular femtosecond pulse, transmits to femtosecond pulse one；
The annulus light generating device is expanded the concavees lens, convex lens and annulus light generating unit of part by femtosecond pulse
The 0-2 π spiral phase plate composition divided.
It is an advantage of the invention that structure novel, the reflecting mirror that script is used to adjust angle between laser pulse is reduced by 6
To 2, by the change of the circle diameter to circular femto-second laser pulse, to adjust the angle between femto-second laser pulse, this
Script is needed the time correlation coherent anti-stokes raman scattering technology of 6 femto-second laser pulses adjusting freedom degrees by invention,
It is optimized for only adjusting 3 adjusting freedom degrees of circle diameter of 2 reflecting mirrors and circular femto-second laser pulse, substantially increases and be
The stability of system, adjustable ease for use and repeatability.
Detailed description of the invention
Fig. 1 is the principle of the present invention figure.
Specific embodiment
Femtosecond pulse generator 1 generate a branch of femtosecond pulse 3, after reflecting mirror 1, beam splitter 6, will
Femtosecond pulse 3 is divided into the identical femtosecond pulse 1 of two beam wavelength and femtosecond pulse 25, wherein femtosecond pulse
Laser 25 enters optical parametric oscillator 4, and the wavelength for the femtosecond pulse 37 being emitted from optical parametric oscillator 4 can occur
Change, realize the adjusting of the wavelength of femtosecond pulse 37 in a certain range, flies by what optical parametric oscillator 4 generated
Pulse per second (PPS) laser 37 forms a branch of annulus shape femtosecond pulse 12, the annulus after annulus light generating device 8
Shape femtosecond pulse 12 is closed at dichroscope 11 with the femtosecond pulse 1 after the reflection of reflecting mirror 2 10
Beam, obtains that a branch of coaxial mixing femtosecond pulse, wherein femtosecond pulse 1 is located at circular femtosecond pulse 12
It is intermediate；The coaxial mixing femtosecond pulse converges at the sample among sample cell 14 after convex lens 1, this
When the coaxial mixing femtosecond pulse and sample of the centre of sample cell 14 interact, generate a wavelength and converge in
The different signal pulse laser 15 of coaxial mixing femtosecond pulse on sample, making the pulse laser through sample includes three kinds
Femtosecond pulse 9, annulus shape femtosecond pulse 12 and the signal pulse laser 15 of wavelength, the arteries and veins comprising these three wavelength
After reflecting mirror 3 17, optical filter 18, signal pulse laser 15 is retained impulse light, and signal pulse laser 15 is through excess convexity
3 19 shrink beam of lens, is received by photomultiplier tube reception device 20, is recorded and is connected with photomultiplier tube reception device 20
On computer 21.Computer can be recorded under different experimental conditions, by data acquisition software if sample is by femtosecond laser arteries and veins
After impulse hair, the information such as intensity and wavelength by the signal pulse laser 15 under the different delays time, and draw corresponding figure
Table analyzes experimental result on one side.
11 pairs of the dichroscope circular femtosecond pulses 12 reflect, and carry out to femtosecond pulse 1 saturating
It penetrates；
The annulus light generating device 8 is expanded the concavees lens 801, convex lens 802 and annulus of part by femtosecond pulse
The 0-2 π spiral phase plate 803 that light generates part forms.
Whole system is placed on uniform optical platform, and femtosecond pulse generator 1 is located at the lower right of whole system,
Optical parametric oscillator 4 is located at the left side of femtosecond pulse generator 1, and annulus light generating device 8 is located at optical parametric oscillator
The left side of device 4, sample cell 14 are located at femtosecond pulse generator 1, optical parametric oscillator 4 and annulus light generating device 8
Top.
Claims (3)
1. a kind of coaxial femtosecond time Correlated Coherent anti-Stokes Raman scatters test macro, it is characterised in that: femtosecond pulse
Laser generator generate a branch of femtosecond pulse, after reflecting mirror one, beam splitter, femtosecond pulse is divided into two beams
The identical femtosecond pulse one of wavelength and femtosecond pulse two, wherein femtosecond pulse two enters optical parametric oscillator
The wavelength of device, the femtosecond pulse three being emitted from optical parametric oscillator can change, and realize femtosecond pulse three
The adjusting of wavelength in a certain range is produced by the femtosecond pulse three that optical parametric oscillator generates using annulus light
After generating apparatus, form a branch of annulus shape femtosecond pulse, the annulus shape femtosecond pulse with it is anti-through reflecting mirror two
Femtosecond pulse one after penetrating carries out conjunction beam at dichroscope, obtains a branch of coaxial mixing femtosecond pulse, wherein flies
Pulse per second (PPS) laser one is located at the centre of circular femtosecond pulse；The coaxial mixing femtosecond pulse passes through convex lens one
Afterwards, it converges at the sample among sample cell, at this time the coaxial sample mixed among femtosecond pulse and sample cell
It interacts, generating a wavelength, the signal pulse different from the coaxial mixing femtosecond pulse converged on sample swashs
Light, making the pulse laser through sample includes femtosecond pulse, annulus shape femtosecond pulse and the signal of three kinds of wavelength
Pulse laser, after reflecting mirror three, optical filter, signal pulse laser is retained the pulse laser comprising these three wavelength
Come, signal pulse laser passes through three shrink beam of convex lens, is received by photomultiplier tube reception device, is recorded and connects with photomultiplier tube
On the computer that receiving apparatus is connected.
2. a kind of coaxial femtosecond time Correlated Coherent anti-Stokes Raman according to claim 1 scatters test macro,
It is characterized by: the dichroscope reflects circular femtosecond pulse, femtosecond pulse one is transmitted.
3. a kind of coaxial femtosecond time Correlated Coherent anti-Stokes Raman according to claim 1 scatters test macro,
It is characterized by: the annulus light generating device is produced by the concavees lens, convex lens and annulus light that femtosecond pulse expands part
The 0-2 π spiral phase plate of first portion forms.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113155311A (en) * | 2021-04-22 | 2021-07-23 | 中国工程物理研究院流体物理研究所 | CARS temperature measurement method and device |
| CN114563367A (en) * | 2022-03-02 | 2022-05-31 | 吉林大学 | Circular polarization transient absorption spectrum system for diagnosing coaxial BOXCRS configuration under extreme conditions |
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| CN205166175U (en) * | 2015-11-17 | 2016-04-20 | 北华航天工业学院 | Hollow ring beam diameter adjusting device |
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| CN113155311A (en) * | 2021-04-22 | 2021-07-23 | 中国工程物理研究院流体物理研究所 | CARS temperature measurement method and device |
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| CN114563367A (en) * | 2022-03-02 | 2022-05-31 | 吉林大学 | Circular polarization transient absorption spectrum system for diagnosing coaxial BOXCRS configuration under extreme conditions |
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