CN206697746U - A kind of femtosecond Superfast time resolution photoelectricity spectroscopy systems - Google Patents
A kind of femtosecond Superfast time resolution photoelectricity spectroscopy systems Download PDFInfo
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- CN206697746U CN206697746U CN201720004631.XU CN201720004631U CN206697746U CN 206697746 U CN206697746 U CN 206697746U CN 201720004631 U CN201720004631 U CN 201720004631U CN 206697746 U CN206697746 U CN 206697746U
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- 230000005622 photoelectricity Effects 0.000 title claims abstract description 59
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Abstract
A kind of femtosecond Superfast time resolution photoelectricity spectroscopy systems, including ultra-short pulse laser system, extreme ultraviolet ultrashort pulse generation system, optical parameter converting system and photoelectricity spectroscopy systems；The laser output of ultra-short pulse laser system is divided into two by beam splitting chip, wherein a branch of to be used as pump light by ultra-short pulse laser outside optical parameter converting system output visible red, the laser that another beam generates the high photon energy of system output by extreme ultraviolet ultrashort pulse is used as detection light；Pump light and detection light enter photoelectricity spectroscopy systems jointly, are incident to the sample surfaces in photoelectricity spectroscopy systems by pump probe bundling device, the light induced electron being excited enters the photoelectron spectrograph of photoelectricity spectroscopy systems；Extreme ultraviolet ultra-short pulse laser generates system, and photoelectricity spectroscopy systems are respectively positioned on vacuum system.
Description
Technical field
A kind of photoelectricity spectroscopy systems of advanced material research are the utility model is related to, when more particularly to a kind of femtosecond is ultrafast
Between resolved light electric energy spectra system.
Background technology
Photoelectricity power spectrum is to be based on photoelectric effect[1], photoelectrons are excited from sample using monochromatic high-energy photon, utilize production
The information such as photoelectronic kinetic energy, intensity and angle distribution are given birth to study the electronics of atom, molecule, condensed phase, the especially surface of solids
Band structure[2], or even the motion conditions of atomic nucleus inner electron can be understood.And when monochromatic excitation light becomes arteries and veins from continuous light
During impulse light, photoelectricity power spectrum is just provided with time-resolved function, and sample surfaces electronics is told using ultra-short pulse laser
Excitation process, electron motion, compound, the ultra-fast dynamics process such as relaxation can be told in time scale[3], it is the mankind
Solution new material, the growth of accurate manipulation material and research industrial applications in future provide a kind of advanced research meanses.
In the past, extreme ultraviolet light-pulse generator can be obtained by Synchrotron Radiation[4], but synchrotron radiation equipment occupation of land face is huge,
Cost is high, generally requires State-level and supports to build, and the pulsewidth of synchrotron radiation light source is typically in picosecond magnitude, time point
The ability distinguished is restricted.In recent years, with the development of solid femtosecond pulse technology[5], gain media is used as using Ti∶Sapphire laser
High power femtosecond pulse be used for excited inert gas, produce extreme ultraviolet laser high-energy photons[6], so as in system
In structure and cost so that the photoelectron spectroscopy of Superfast time resolution is possibly realized.
It is general to be swashed using the femtosecond based on Ti∶Sapphire laser in order to realize that the photoelectron spectroscopy of femtosecond Superfast time resolution measures
Light is as light source, for producing higher hamonic wave.But traditional spectrometer introduces excessive dispersion, causes pulse width broadening, it is difficult to
Realize the measurement of femtosecond.Although other multilayer dielectricity mirror or filter plate can ensure pulsewidth, expensive, and can not
The test of multiple wavelength is realized, is insufficient for growing scientific research demand.Therefore, it is badly in need of a kind of low cost of exploitation in industry
, the femtosecond Superfast time resolution photoelectricity spectroscopy systems of good reliability.
Bibliography：
[1]Einstein,A.,Ann.Physik 31,132(1905).
[2]Brundle,C.R.and Baker,A.D.et al.Vol.1,(Academic Press, New York,
1977).
[3]Gierz I,et al.Nature materials,2013,12(12):1119-1124.
[4]Bachrach,R.Z,et al.Vol.1,(Plenum Press,New York,1992).
[5]Strickland D,Mourou G et al.Optics communications,1985,55(6): 447-
449.
[6]Krause J L,Schafer K J,Kulander K C.Physical Review Letters, 1992,
68(24):3535.
[7] S,Klenke A,Rothhardt J,et al.Nature Photonics,2014, 8(10):
779-783。
Utility model content
The utility model purpose, technical problem to be solved are：For being used as photoelectron energy by the use of higher hamonic wave instantly
The light source of spectrum, traditional raster light splitting clock pulse be present and be wider than width, it is difficult to realize that femtosecond measures, be difficult to again using filter plate more
The problem of wavelength measurement, the utility model provide a kind of femtosecond Superfast time resolution photoelectricity spectroscopy systems device.
Technical solutions of the utility model, a kind of femtosecond Superfast time resolution photoelectricity spectroscopy systems, including ultrashort pulse swash
Photosystem, extreme ultraviolet ultrashort pulse generation system, optical parameter converting system and photoelectricity spectroscopy systems；Ultra-short pulse laser system
The laser output of system is divided into two by beam splitting chip, wherein a branch of visible-infrared ultrashort by the output of optical parameter converting system
For pulse laser as pump light, the laser that another beam generates the high photon energy of system output by extreme ultraviolet ultrashort pulse is used as spy
Light-metering；Pump light and detection light enter photoelectricity spectroscopy systems jointly, and photoelectricity spectroscopy systems are incident to by pumping-detection bundling device
In sample surfaces, the light induced electron being excited enter photoelectricity spectroscopy systems photoelectron spectrograph；Extreme ultraviolet ultrashort pulse swashs
Photogenerated system, photoelectricity spectroscopy systems are respectively positioned in vacuum system；
The ultra-short pulse laser system includes ultrashort pulse mode locking oscillator, pulse stretcher, laser amplifier, pulse
Compression/reshaper；The laser amplifier includes Q-switched laser, resonator, Pockers cell.
The extreme ultraviolet ultra-short pulse laser generation system includes extreme ultraviolet ultra-short pulse laser generator and extreme ultraviolet
Ultra-short pulse laser monochromator；
The optical parameter converting system, pumping laser is changed to ultraviolet to infrared band by nonlinear crystal；
The extreme ultraviolet ultra-short pulse laser generator, extreme ultraviolet ultra-short pulse laser monochromator, pump light and detection light
Bundling device and photoelectron spectrograph are respectively positioned in vacuum system.
Provided with extreme ultraviolet ultra-short pulse laser focus device, extreme ultraviolet ultra-short pulse laser multi-dimensional adjusting mechanism is by ultrashort arteries and veins
Impulse light focuses to specific inert gas and produces extreme ultraviolet pulse laser.
The extreme ultraviolet ultra-short pulse laser monochromator includes grating, either filter plate or many layer mirror, speculum and its
Multidimensional adjusts structure.
The pump light and detection combiner device include speculum, focus lamp, multi-dimensional adjusting mechanism；
Vacuum system includes shell, Vacuum generating system, vacuum measurement system.
The photoelectricity spectroscopy systems include：Time synchronism apparatus, pump light and detection combiner device and photoelectron spectroscopy
Instrument；The photoelectricity energy disperse spectroscopy includes the equipment that hemisphere analyzer, time of-flight mass spectrometer etc. is used for photoelectricity power spectrum.
The shell is provided with laser input window, watch window.
The utility model beneficial effect：A kind of femtosecond Superfast time resolution photoelectricity energy pedigree provided by the utility model
System has following advantage：
1st, system is generated using described extreme ultraviolet ultra-short pulse laser, the system can obtain the monochromatic extremely purple of femtosecond
Outer laser carries out photoelectricity power spectrum test.
2nd, system is generated using described extreme ultraviolet ultra-short pulse laser, the system can obtain the list of different photon energies
Color extreme ultraviolet laser carries out photoelectricity power spectrum test.
3rd, using described optical parameter converting system, the system tests the material of various band gap, from tens of meV to several
Individual eV.
4th, the Photodetection system of conventional solid laser is used in contrast to other, present system provides one kind more to step up
Gather, significantly more efficient device was both cost-effective, also reduced floor space, so as to its using and promoting in common laboratory.
Brief description of the drawings
Fig. 1 is a kind of structural representation of femtosecond Superfast time resolution photoelectricity spectroscopy systems of the utility model.
Fig. 2 is the structure of vacuum system part in a kind of femtosecond Superfast time resolution photoelectricity spectroscopy systems of the utility model
Schematic diagram.
Fig. 3 is according to whole light in a kind of embodiment of femtosecond Superfast time resolution photoelectricity spectroscopy systems of the utility model
The structural representation of electric energy spectra system.
Fig. 4 is according to ultrashort arteries and veins in a kind of embodiment of femtosecond Superfast time resolution photoelectricity spectroscopy systems of the utility model
The structural representation of impulse photosystem.
Fig. 5 is according to extreme ultraviolet in a kind of embodiment of femtosecond Superfast time resolution photoelectricity spectroscopy systems of the utility model
The structural representation of pulse laser generator.
Fig. 6 is according to extreme ultraviolet in a kind of embodiment of femtosecond Superfast time resolution photoelectricity spectroscopy systems of the utility model
The structural representation of ultra-short pulse laser monochromator.
Fig. 7 is according to pump light in a kind of embodiment of femtosecond Superfast time resolution photoelectricity spectroscopy systems of the utility model
With the structural representation of detection combiner device.
Fig. 8 is according to photoelectricity energy in a kind of embodiment of femtosecond Superfast time resolution photoelectricity spectroscopy systems of the utility model
The structural representation of spectrometer.
Fig. 9 is according to vacuum system in a kind of embodiment of femtosecond Superfast time resolution photoelectricity spectroscopy systems of the utility model
The structural representation of system.
Figure 10 is according to extremely purple in a kind of embodiment of femtosecond Superfast time resolution photoelectricity spectroscopy systems of the utility model
Spectrum obtained by outer ultra-short pulse laser generation system.
In figure：1- ultra-short pulse laser systems；1.1- ultrashort pulse mode locking oscillators；1.2- pulse stretcher, 1.3- swashs
Image intensifer, 1.4- pulse compressions/reshaper
2- extreme ultraviolets ultra-short pulse laser generates system；2.1- extreme ultraviolet pulse ultra-short pulse laser generation systems；
2.1.1- laser input window；2.1.2- convex lens；2.1.3- rare gas box；2.1.4- multi-dimensional adjusting mechanism； 2.1.5-
Extreme ultraviolet laser output window；2.2- extreme ultraviolet ultra-short pulse laser monochromators；2.2.1- laser input window；2.2.2- curved surface
Speculum；2.2.3- balzed grating,；2.2.4- curved reflector；2.2.5- slit；2.2.6- laser output window；
3- photoelectricity spectroscopy systems；3.1- time synchronism apparatus；3.2- pump lights and detection combiner device；3.2.1- light is detected
Input port；3.2.2- pump light input window；3.2.3- plane mirror；3.2.4- curved reflector；3.2.5- close beam output
Window；3.3- photoelectron spectrograph；3.3.1- close beam input window；3.3.2- vacuum reaction chamber；3.3.3- sample holder；
3.3.4- hemisphere electron spectroscopy analysis instrument；
4- optical parameter converting systems；5- vacuum systems；5.1- laser input window；5.2- pump light input windows；
5.3- watch window；5.4- Vacuum generating system；5.5 vacuum measurement systems.
Embodiment
With reference to Figure of description and embodiment, specific embodiment of the present utility model is made further to retouch in detail
State.Following examples are merely to illustrate the utility model, but are not limited to the scope of the utility model.
Embodiment：
As shown in figure 3, the present embodiment describes a kind of femtosecond Superfast time resolution photoelectricity spectroscopy systems, including ultrashort arteries and veins
Impulse photosystem 1, extreme ultraviolet ultra-short pulse laser generator 2.1, extreme ultraviolet ultra-short pulse laser monochromator 2.2, time synchronized
Device 3.1, pump light and detection combiner device 3.2, photoelectron spectrograph 3.3, optical parameter converting system 4.
The extreme ultraviolet ultra-short pulse generation device, extreme ultraviolet ultrashort pulse monochromator, pump light and detection combiner device, light
Electron spectrometer is in the vacuum system 3.
Ultra-short pulse laser system is to be based on Ti∶Sapphire laser amplifying technique, can realize the laser output of high energy pulse.It is logical
The beam splitting chip of specific beam splitting ratio is crossed, laser is divided into two, and respectively enters extreme ultraviolet ultra-short pulse laser generation system and light
Learn parameter transform system.
The Laser Focusing for generating system into extreme ultraviolet ultra-short pulse laser excites generation extremely purple into specific inert gas
Outer ultra-short pulse laser (i.e. higher hamonic wave), that includes the laser of multiple wavelength.Then, it is monochromatic by extreme ultraviolet ultrashort pulse
Instrument, extreme ultraviolet ultra-short pulse laser can realize separation spatially, and with reference to specific means, we can obtain monochrome
Extreme ultraviolet ultra-short pulse laser, the detection light as photoelectricity spectral measurement.
Laser into optical parameter converting system is converted into by nonlinear crystal the ultrashort arteries and veins of ultraviolet-infrared band
Impulse light, the pump light as photoelectricity spectral measurement.
Detection light and pump light enter photoelectricity spectroscopy systems jointly.Pump light first has to elapsed time sychronisation, passes through
The change of delay line detects the delay of light and pump light in time to realize in device.Then, detect light and pump light passes through
Bundling device closes beam, together into photoelectron spectrograph.
Pump light first reaches sample, excites the electronics of sample, and the effect such as transition occurs.Then by special time is poor (can
Passage time sychronisation changes the time difference), detection light reaches sample, detects the transition of electronics in sample, relaxation situation, point
Analyse its ultra-fast dynamics problem.
The ultra-short pulse laser system 1 includes：Ultrashort pulse mode locking oscillator 1.1, pulse stretcher 1.2, laser is put
Big device 1.3, pulse compression/reshaper 1.4.
As shown in figure 4, in the present embodiment ultrashort pulse mode locking oscillator 1.1 can output center wavelength be 800nm ripples
Section, repetition frequency are 1kHz, and the ultra-short pulse laser that pulsewidth is 50fs (pays attention to, the present embodiment can also take its all band, repetition
Etc. the oscillator of other specification)；Pulse stretcher 1.2 utilizes element (such as grating, dispersed light with effect of dispersion effect
Fibre etc.) line broadening is entered to laser pulse width；Laser amplifier 1.3 mainly utilizes and adjusts Q lasers and Ti∶Sapphire laser resonator to pulse
Energy is amplified；Pulse compression/reshaper 1.4 reduces the pulsewidth of pulse using dispersion compensation device, reaches femtosecond rank.
As shown in Fig. 2 or Fig. 9, the vacuum system includes：Laser input window 5.1, pump light input window 5.2,
Watch window 5.3, Vacuum generating system 5.4, vacuum measurement system 5.5.
In the present embodiment, in the vacuum system laser input window 5.1 and pump light input window 5.2 using low
Dispersion window, it is ensured that the pulsewidth of laser is not broadened.Vacuum generating system in the vacuum system, mainly passes through dry pump and molecule
Pump group maintains the vacuum of vacuum system into two-stage vacuum pump；Vacuum measurement system in the vacuum system：Mainly by multiple
Close silicon vacuum meter and carry out measurement of vacuum.
The extreme ultraviolet ultra-short pulse laser generator includes laser input window 2.1.1, convex lens 2.1.2, rare gas
Body box 2.1.3, multi-dimensional adjusting mechanism 2.1.4, extreme ultraviolet laser output window 2.1.5.
As shown in figure 5, convex lens 2.1.2 focal lengths are equal to 800mm in the present embodiment, for focusing on incident pulse laser,
Focus is at gas nozzle 2.1.3 centers.
Multi-dimensional adjusting mechanism 2.1.4 is mainly used for adjusting the position of gas nozzle, to meet higher hamonic wave generating process
In phase matched.
In the present embodiment, the vacuum in extreme ultraviolet ultra-short pulse generation device is 10-3Mbar or so.
The extreme ultraviolet ultra-short pulse laser monochromator 2.2 includes：Laser input window 2.2.1；Curved reflector
2.2.2；Balzed grating, 2.2.3；Curved reflector 2.2.4；Slit 2.2.5；Laser output window 2.2.6；Incident extreme ultraviolet
Incided after the collimation that ultra-short pulse laser passes through curved reflector 2.2.2 on balzed grating, 2.2.3, point of balzed grating,
Light action enables extreme ultraviolet ultra-short pulse laser to be spatially separated from out, and then passes through curved reflector 2.2.4 remittance again
It is poly-, adjustable slit 2.2.5 is focused on, is sized to pick out extreme ultraviolet ultra-short pulse laser by change slit.
In the present embodiment, slit size is 100 microns, can differentiate 10-40eV extreme ultraviolet ultra-short pulse laser；In pole
One deep ultraviolet detector is also installed, quantitatively to measure extreme ultraviolet laser after UV ultrashort laser monochromator 2.2
Number of photons.As shown in Figure 10, in the present embodiment, the extreme ultraviolet ultra-short pulse laser generation system obtains different photon energies
Extreme ultraviolet laser, applied to different scientific research demands.
The vacuum of extreme ultraviolet laser beam splitting system is 10 in the present embodiment-7Mbar or so.
The pump light and detection combiner device 3.2：Detect optical input window 3.2.1；Pump light input window
3.2.2；Plane mirror 3.2.3；Curved reflector 3.2.4；Close beam output window 3.2.5；
As shown in fig. 7, in the present embodiment, light input window 3.2.1 is detected in the pump light and detection combiner device
It is connected with laser output window 2.2.6 in upper level extreme ultraviolet laser beam splitting system 2.2 by stainless-steel pipe.Incident is extremely purple
Outer laser focuses on photoelectricity spectral measurement system by curved reflector 3.2.4.From the another of optical parameter converting system 4
Shu Jiguang is incided in vacuum cavity from laser input window 3.2.2, and photoelectricity spectral measurement is incided by speculum 3.2.3
System.
In the present embodiment, the vacuum of laser collecting system is 10-9mbar。
The photoelectron spectrograph 3.3, close beam input window 3.3.1；Vacuum reaction chamber 3.3.2；Sample holder
3.3.3；Hemisphere electron spectroscopy analysis instrument 3.3.4；
As shown in figure 8, in the present embodiment, laser input window 3.3.1 and previous stage in photoelectricity spectral measurement system 3.3
Pump light is connected with conjunction beam output window 3.2.5 in detection combiner device by stainless steel pipes with edge of a knife flange.
Sample is placed in photoelectricity spectral measurement system on sample holder 3.3.3 by transport mechanism.Two beam laser point
The same position of sample is not focused on, but a time delay be present between both pulses, when this time delay can pass through
Between sychronisation 3.1 adjust.So, the photon of high-energy can not only excite the electronics of sample surfaces, and have
Time-resolved function, fine resolution go out locomotory mechanism of the electronics in ultrafast process.Hemisphere analyzer 3.3.4 is public by SPECS
Department provides, main to be responsible for collecting the photon being inspired, and by changing the angle of hemisphere analyzer, can be collected into different angle
Photon signal, analyze its momentum information.
In this embodiment, reaction chamber 3.3.2 vacuum is 10-10Mbar or so.
It should be pointed out that on the premise of the utility model principle is not departed from, make suitably modified or replace, these modifications or
Person replaces and also should be regarded as the scope of protection of the utility model.
Claims (7)
- A kind of 1. femtosecond Superfast time resolution photoelectricity spectroscopy systems, it is characterized in that including ultra-short pulse laser system, extreme ultraviolet Ultrashort pulse generates system, optical parameter converting system and photoelectricity spectroscopy systems；The laser output of ultra-short pulse laser system It is divided into two by beam splitting chip, wherein a branch of be used as by visible-infrared ultra-short pulse laser of optical parameter converting system output Pump light, the laser that another beam generates the high photon energy of system output by extreme ultraviolet ultrashort pulse are used as detection light；Pump light Enter photoelectricity spectroscopy systems jointly with detection light, the sample table in photoelectricity spectroscopy systems is incident to by pumping-detection bundling device Face, the light induced electron being excited enter the photoelectron spectrograph of photoelectricity spectroscopy systems；Extreme ultraviolet ultra-short pulse laser generates system, Photoelectricity spectroscopy systems are respectively positioned in vacuum system；The ultra-short pulse laser system includes ultrashort pulse mode locking oscillator, pulse stretcher, laser amplifier, pulse pressure Contracting/reshaper；The laser amplifier includes Q-switched laser, resonator, Pockers cell；The extreme ultraviolet ultra-short pulse laser generation system includes extreme ultraviolet ultra-short pulse laser generator and extreme ultraviolet is ultrashort Pulse laser monochromator；The optical parameter converting system, pumping laser is changed to ultraviolet to infrared band by nonlinear crystal；The extreme ultraviolet ultra-short pulse laser generator, extreme ultraviolet ultra-short pulse laser monochromator, pump light and detection combiner Device and photoelectron spectrograph are respectively positioned in vacuum system.
- 2. a kind of femtosecond Superfast time resolution photoelectricity spectroscopy systems according to claim 1, it is characterised in that provided with pole Ultra-short pulse laser is focused to spy by UV ultrashort laser focus device, extreme ultraviolet ultra-short pulse laser multi-dimensional adjusting mechanism Determine inert gas and produce extreme ultraviolet pulse laser.
- A kind of 3. femtosecond Superfast time resolution photoelectricity spectroscopy systems according to claim 2, it is characterised in that the pole UV ultrashort laser monochromator includes grating, either filter plate or many layer mirror, speculum and its multidimensional adjustment structure.
- A kind of 4. femtosecond Superfast time resolution photoelectricity spectroscopy systems according to claim 1, it is characterised in that the pump Pu light and detection combiner device include speculum, focus lamp, multi-dimensional adjusting mechanism.
- A kind of 5. femtosecond Superfast time resolution photoelectricity spectroscopy systems according to claim 1, it is characterised in that vacuum system System includes shell, Vacuum generating system, vacuum measurement system.
- A kind of 6. femtosecond Superfast time resolution photoelectricity spectroscopy systems according to claim 1, it is characterised in that the light Electric energy spectra system includes：Time synchronism apparatus, pump light and detection combiner device and photoelectricity energy disperse spectroscopy；The photoelectricity energy disperse spectroscopy Including hemisphere analyzer, time of-flight mass spectrometer.
- 7. a kind of femtosecond Superfast time resolution photoelectricity spectroscopy systems according to claim 5, it is characterised in that described outer Shell is provided with laser input window, watch window.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108680265A (en) * | 2018-06-01 | 2018-10-19 | 中国科学院西安光学精密机械研究所 | High repetition frequency attosecond pulse photoelectron and ion energy spectrum measuring system and method |
| CN112326029A (en) * | 2020-10-19 | 2021-02-05 | 南京航空航天大学 | Novel ultrafast real-time spectrum analyzer |
| CN113984205A (en) * | 2021-09-29 | 2022-01-28 | 南京大学 | Cd is adjusted through low-energy optical pumping3As2Method for prolonging carrier lifetime of film in visible light wave band |
-
2017
- 2017-01-04 CN CN201720004631.XU patent/CN206697746U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108680265A (en) * | 2018-06-01 | 2018-10-19 | 中国科学院西安光学精密机械研究所 | High repetition frequency attosecond pulse photoelectron and ion energy spectrum measuring system and method |
| CN112326029A (en) * | 2020-10-19 | 2021-02-05 | 南京航空航天大学 | Novel ultrafast real-time spectrum analyzer |
| CN113984205A (en) * | 2021-09-29 | 2022-01-28 | 南京大学 | Cd is adjusted through low-energy optical pumping3As2Method for prolonging carrier lifetime of film in visible light wave band |
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