CN107449738A - A kind of dual-beam pump probe experimental system - Google Patents
A kind of dual-beam pump probe experimental system Download PDFInfo
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- CN107449738A CN107449738A CN201710470834.2A CN201710470834A CN107449738A CN 107449738 A CN107449738 A CN 107449738A CN 201710470834 A CN201710470834 A CN 201710470834A CN 107449738 A CN107449738 A CN 107449738A
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- 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
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- 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
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- 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
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- 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
Abstract
The invention provides a kind of dual-beam pump probe experimental system, pass through the first beam splitter, femtosecond laser beam is divided into one-level pump light and detection light, existence time postpones between one-level pump light and detection light, one-level pump light is divided into by two beam diode pumping light by the second beam splitter, wherein a branch of diode pumping light is vertical with another beam diode pumping light after multiple reflections to converge to the 3rd beam splitter, after the beam splitting of the 3rd beam splitter elder generation closes beam again, it is merged into the two beam level Four pump lights that the femtosecond comprising four different delayed times swashs pulse, detection light after delay in sample surfaces after the convergence of level Four pump light line focus lens with forming a hot spot, two-dimensional imaging of the sample to the absorption signal of detection light is obtained by optical signal collection system.The present invention, which realizes, realizes the increase of sample surfaces transient state reflectivity jump number, and energy control time delay, therefore dual-beam pump probe can be used to test the visual research that realize ultra-fast dynamics process inside material.
Description
Technical field
The invention belongs to laser technology field, is related to femtosecond laser processing and research film ultra-fast dynamics field, especially
It is related to a kind of dual-beam pump probe experimental system.
Background technology
In recent years, as the development of ultrafast laser technique, pump probe technology are valued by people.Pump probe technology
A bundle of pulsed laser is typically divided into a branch of stronger pump light and a branch of weaker detection light.Wherein, pump light acts on
Testing sample, cause the change of sample；The variable condition of sample is detected by detecting light.According to testing result, sample can be obtained
The information of product.This technology is all used widely in fields such as image checking field, molecule and electron dynamics analysis detections.
In usual pumping detecting method, sample is excited using single beam pump light, single beam or multi beam detection light reaction pumping is visited
Signal is surveyed, in the prior art, is also not carried out sample surfaces transient state reflectivity jump duration growth technology, therefore can not
Realize the visual research of ultra-fast dynamics process inside material；
For can in more accurate research material microcosmic particle compound movement rule, capture transient changing information, this
Invention is proposed, increases spectroscope to former experimental system, and original single beam pump light is divided into two beam pump lights, two beam pump lights it
Between have a regular hour delay, it is constant to visit photometric beams, increases the number of more subtransient reflectivity jumps, or increase per subtransient
The duration of reflectivity jump, therefore the experiment of dual-beam pump probe can be used to realize ultra-fast dynamics process inside material
Visual research.
The content of the invention
For Shortcomings in the prior art, the invention provides a kind of dual-beam pump probe experimental system, pass through increasing
Add beam splitter, original femtosecond laser beam is divided into pump light and detection light, had between the pump light and detection light certain
Time delay, realize that two beam pump lights are acted on sample by setting up beam splitter, so as to add sample surfaces multiple wink
The number of state reflectivity jump, or the duration of the every subtransient reflectivity jump of increase, and then can be to the spy of specimen material
Property has a better understanding, and makes the application of pumping-detection technology wider.
The present invention is to realize above-mentioned technical purpose by following technological means.
A kind of dual-beam pump probe experimental system, it is characterised in that including femtosecond laser light source system, the first beam splitting
Mirror, four pulse double pumping action optical transmission systems, detection optical transmission system, the first condenser lens, computer and optical signal collection system；
The pulse laser that the femtosecond laser light source system is sent by the first beam splitter be divided into single beam one-level pump light and
Detect light；
Four pulse double pumping action optical transmission systems include chopper, the second beam splitter, the 3rd speculum, the 4th speculum, the
Three beam splitters and the 5th speculum, the chopper are modulated into calculating mechatronics, single beam one-level pump light by chopper
1:1 interrupted square-wave sequence, the interrupted square-wave sequence are divided into the orthogonal diode pumping light of two beams by the second beam splitter；
3rd speculum is parallel with the second beam splitter, and the 4th speculum is vertical with the 3rd speculum, wherein a branch of diode pumping
Light is successively after the 3rd speculum and the 4th speculum vertically reflect twice, and a branch of diode pumping light is vertical converges in addition
3rd beam splitter, after the 3rd beam splitter beam splitting, two beam diode pumping light are divided into the three-level pump light of four beam different delayed times, institute
State that the transmission direction of four beam three-level pump lights is identical two-by-two, be incorporated into two beams that the femtosecond comprising four different delayed times swashs pulse
Level Four pump light, wherein a branch of level Four pump light is mutually flat with another beam level Four pump light after the 5th speculum vertically reflection
OK；
The detection optical transmission system includes detection optical time delay unit and the second speculum and the 6th speculum that are parallel to each other,
It is described detection optical time delay unit with calculate mechatronics, for change detection light light path with change one-level pump light with detection light it
Between time delay, second speculum and the 6th speculum be parallel to each other, and the detection light after delay passes through the second speculum
After vertically being reflected twice with the 6th speculum, and two beam level Four pumping parallel lights and close to each other, and hung down with the first condenser lens
Directly；
Detection light after delay and two beam level Four pump lights are focused into the hot spot of sample surfaces by the first condenser lens；
The optical signal collection system is used to obtain sample after by two beam level Four pumping light actions, and detection optical detection is in difference
During time delay, the change of the transient state reflectivity of sample, the transient state reflectivity of sample is obtained with the curve of time delay variation.
Preferably, the optical signal collection system is gathered including charge-coupled device CCD, the 7th speculum, Glan prism, second
Jiao Jing, detector and lock-in amplifier；
7th speculum, Glan prism and second focus lamp are located in same light path, and the charge-coupled device CCD is used
Whether overlapped in the hot spot formed on observation sample；Pass through the reflection of the 7th speculum from the detection light of sample surfaces reflection, wear
Glan prism is crossed, the Glan prism filters out the pump light of partial dispersion, and second focus lamp is focused on by Glan prism mistake
Detection light after filter, detector receives the detection light focused on by the second focus lamp, and converts optical signal into electric signal, the electricity
Signal is input in computer after lock-in amplifier, what the transient state reflectivity that computer provides sample changed with time delay
Curve.
Preferably, the chopper with 2000Hz frequency to one-level pumping light modulation, by one-level pumping light modulation into accounting for
Sky is than being 1:1 interrupted square-wave train pulse.
Preferably, the temporal resolution of the detection optical time delay unit is 66.7fs.
Preferably, the femtosecond laser light source system includes Verdi pumping sources and ti∶sapphire laser femto-second laser, described
The light source of Verdi pumping sources output obtains pulse laser after ti∶sapphire laser femto-second laser.
Preferably, the femtosecond laser light source system includes Verdi pumping sources and ti∶sapphire laser femto-second laser, described
Verdi pumping source power outputs peak power is 5W, and wavelength is 532nm green glow, is obtained after ti∶sapphire laser femto-second laser
Centre wavelength is 800nm, and repetition rate 82MHz, single pulse width is 30fs pulse laser.
Preferably, first beam splitter, the second beam splitter and the 3rd beam splitter are unpolarized beam splitter.
Preferably, the splitting ratio of first beam splitter is 7:3.
Preferably, the splitting ratio of second beam splitter and the 3rd beam splitter is 1:1.
Preferably, in addition to the first speculum (3), the pulse laser that the femtosecond laser light source system is sent pass through first
Speculum (3) reflexes to the first beam splitter (4).
Beneficial effects of the present invention：
The present invention increases a beam splitter on the basis of original beam splitting light, by single beam pumping caused by femto-second laser pulse
Light is divided into two beam pump lights, wherein a branch of sub- pump light after the regular hour postpones, converges at other sub- pump beam
Beam splitter, form the femtosecond comprising four different delayed times and swash the beam pump light of pulse two, and this two beams pump light is used to swash
Sample is sent out, improves sample surfaces excitation probability, is readily obtained pump probe signal, realizes more subtransients in increase metallic film
Duration in reflectivity jump number or increase metallic film per subtransient reflectivity jump, it is easy to implement super inside material
The research of fast dynamic process.
Brief description of the drawings
Fig. 1 is the schematic diagram of dual-beam pump probe experimental system of the present invention.
Wherein：
1.Verdi pumping sources；2. ti∶sapphire laser femto-second laser；3. the first speculum；4. the first beam splitter；5. the second reflection
Mirror；6. chopper；7. the second beam splitter；8. the 3rd speculum；9. the 4th speculum；10. the 3rd beam splitter；11. the 5th reflection
Mirror；12. the 6th speculum；13. the first condenser lens；14. the 7th speculum；15. Glan prism；16. the second focus lamp；17.
Detector；18. lock-in amplifier；19. computer；20. sample；21. charge-coupled device CCD；22. detect optical time delay unit；23. one
Level pump light；24. detect light.
Embodiment
Below in conjunction with the accompanying drawings and specific embodiment the present invention is further illustrated, but protection scope of the present invention is simultaneously
Not limited to this.
As shown in figure 1, a kind of dual-beam pump probe experimental system of the present invention, including femtosecond laser light source system
System, the first speculum 3, the first beam splitter 4, four pulse double pumping action optical transmission systems, detection optical transmission system, the first condenser lens
13rd, computer 19 and optical signal collection system.
The femtosecond laser light source system includes Verdi pumping sources 1 and ti∶sapphire laser femto-second laser 2, the femtosecond laser
Light-source system includes Verdi pumping sources 1 and ti∶sapphire laser femto-second laser 2, the power output peak power of Verdi pumping sources 1
For 5W, wavelength is 532nm green glow, and it is 800nm that centre wavelength is obtained after ti∶sapphire laser femto-second laser 2, and repetition rate is
82MHz, single pulse width are 30fs pulse laser.Pulse laser passes through the first unpolarized beam splitter 4, and laser is divided into energy
It is about 7 to measure intensity:3 two bundle of pulsed laser, the larger a branch of conduct one-level pump light of energy, for exciting sample, energy
It is less a branch of as detection light, for detecting the signal for the sample surfaces transient state reflectivity changes being excited.
Four pulse double pumping action optical transmission systems include chopper 6, the second beam splitter 7, the 3rd speculum 8, the 4th speculum
9th, the 3rd beam splitter 10 and the 5th speculum 11, the chopper 6 electrically connect with computer 19, in order to eliminate pump light to transient state
The influence of reflectivity signals, the sensitivity of detector 17 is improved, one-level pump light is entered by chopper 6 with 2000Hz frequency
Row modulation, one-level pumping light pulse is modulated into dutycycle as 1:1 interrupted square-wave train pulse, the second beam splitter 7 is used for will
The higher train pulse of energy is divided into that two beam energies are relatively low and orthogonal diode pumping light；3rd speculum 8 and second point
Beam mirror 7 is parallel, and for vertically reflecting wherein a branch of diode pumping light, the 4th speculum 9 is used to vertically reflect by the 3rd speculum 8
The diode pumping light of reflection so that two beam diode pumping light vertically converge to the 3rd beam splitter 10, and the 3rd beam splitter 10 will
Two beam diode pumping light are divided into four beam three-level pump lights, and the transmission direction of the four beams three-level pump light is identical two-by-two, through the 3rd
10 first beam splitting of beam splitter is merged into the two beam level Four pump lights that the femtosecond comprising four different delayed times swashs pulse, institute again after closing beam again
The 5th speculum 11 is stated to be used for two beam level Four pumping parallel lights.
The detection optical transmission system includes detection optical time delay unit 22 and the second speculum 5 being parallel to each other and the 6th reflection
Mirror 12, the detection optical time delay unit 22 electrically connect with computer 19, and the temporal resolution of detection optical time delay unit 22 is 66.7fs, is used
In the light path for changing detection light to change pump light and detect the time delay between light, second speculum 5 and the 6th is anti-
Mirror 12 is penetrated, for the detection light after vertical reflection delay so that detection light and two beam level Four pumping parallel lights and phase after delay
It is mutually close and vertical with the first condenser lens 13, to ensure that three hot spots overlap after the convergence of the first condenser lens 13,
And a less hot spot is formed on the surface of sample 20, now to ensure that detecting light hot spot falls in level Four pump light center so that
Detection light can be accurately detected the change in level Four pump light excitation area.
The optical signal collection system includes charge-coupled device CCD, the 7th speculum 14, Glan prism 15, second and focused on
Mirror 16, detector 17 and lock-in amplifier 18；The charge-coupled device CCD is used to observe whether the hot spot formed on sample 20 weighs
Close；Pass through the reflection of the 7th speculum 14, through Glan prism 15, the Glan prism from the detection light of the surface of sample 20 reflection
15 filter out the pump light of partial dispersion, and second focus lamp 16 focuses on the detection light after being filtered by Glan prism 15, consider
To the breakdown power of detector 17 and the fluctuation of laser energy, it is desirable to which the mean power for reaching the detection light before detector 17 is necessary
＜ 20mW, detector 17 absorbs the detection light focused on by the second focus lamp 16, and converts optical signal into electric signal, the telecommunications
Number it is input to after lock-in amplifier 18 in computer 19, computer 19 draws the transient state reflection of sample 20 automatically on screen
The curve that rate changes with time delay.
The embodiment is preferred embodiment of the invention, but the present invention is not limited to above-mentioned embodiment, not
Away from the present invention substantive content in the case of, those skilled in the art can make it is any it is conspicuously improved, replace
Or modification belongs to protection scope of the present invention.
Claims (10)
1. a kind of dual-beam pump probe experimental system, it is characterised in that including femtosecond laser light source system, the first beam splitter
(4), four pulse double pumping action optical transmission systems, detection optical transmission system, the first condenser lens (13), computer (19) and optical signal
Acquisition system；
The pulse laser that the femtosecond laser light source system is sent is divided into single beam one-level pump light (23) by the first beam splitter (4)
With detection light (24)；
Four pulse double pumping action optical transmission systems include chopper (6), the second beam splitter (7), the 3rd speculum (8), the 4th reflection
Mirror (9), the 3rd beam splitter (10) and the 5th speculum (11), the chopper (6) electrically connect with computer (19), single beam one-level
Pump light (23) is modulated into 1 by chopper (6):1 interrupted square-wave sequence, the interrupted square-wave sequence pass through the second beam splitter
(7) it is divided into the orthogonal diode pumping light of two beams；3rd speculum (8) is parallel with the second beam splitter (7), the 4th reflection
Mirror (9) is vertical with the 3rd speculum (8), wherein a branch of diode pumping light passes through the 3rd speculum (8) and the 4th speculum successively
(9) twice after vertical reflection, and a branch of diode pumping light is vertical in addition converges to the 3rd beam splitter (10), by the 3rd beam splitter
(10) after beam splitting, two beam diode pumping light are divided into the three-level pump light of four beam different delayed times, the biography of the four beams three-level pump light
Defeated direction is identical two-by-two, the two beam level Four pump lights that the femtosecond comprising four different delayed times swashs pulse is incorporated into, wherein a branch of
Level Four pump light is parallel to each other after the 5th speculum (11) vertically reflection with another beam level Four pump light；
The detection optical transmission system includes detection optical time delay unit (22) and the second speculum (5) being parallel to each other and the 6th reflection
Mirror (12), the detection optical time delay unit (22) electrically connects with computer (19), and the light path of light is detected to change one-level for change
Time delay between pump light and detection light, second speculum (5) and the 6th speculum (12) are parallel to each other, after delay
Detection light after the second speculum (5) and the 6th speculum (12) twice vertical reflection, with two beam level Four pumping parallel lights
It is and close to each other and vertical with the first condenser lens (13)；
Detection light after delay and two beam level Four pump lights are focused into sample (20) surface by first condenser lens (13)
Hot spot；
The optical signal collection system is used to obtain sample (20) after by two beam level Four pumping light actions, and detection optical detection is in difference
During time delay, the change of the transient state reflectivity of sample (20), the transient state reflectivity of sample (20) is obtained with time delay variation
Curve.
A kind of 2. dual-beam pump probe experimental system as claimed in claim 1, it is characterised in that the light signal collection system
System includes charge-coupled device CCD (21), the 7th speculum (14), Glan prism (15), the second focus lamp (16), detector (17)
With lock-in amplifier (18)；
7th speculum (14), Glan prism (15) and the second focus lamp (16) are located in same light path, the electric charge coupling
Clutch CCD (21) is used to observe whether the hot spot formed on sample (20) overlaps, from the detection light warp of sample (20) surface reflection
The reflection of the 7th speculum (14) is crossed, through Glan prism (15), the Glan prism (15) filters out the pumping of partial dispersion
Light, second focus lamp (16) focus on the detection light after being filtered by Glan prism (15), and detector (17) receives to be gathered by second
The detection light that burnt mirror (16) focuses on, and electric signal is converted optical signal into, the electric signal is defeated after lock-in amplifier (18)
Enter into computer (19), computer (19) provides the curve that the transient state reflectivity of sample (20) changes with time delay.
A kind of 3. dual-beam pump probe experimental system as claimed in claim 1, it is characterised in that the chopper (6) with
2000Hz frequency to one-level pumping light modulation, by one-level pumping light modulation into dutycycle be 1:1 interrupted square-wave train pulse.
A kind of 4. dual-beam pump probe experimental system as claimed in claim 1, it is characterised in that the detection optical time delay unit
(22) temporal resolution is 66.7fs.
A kind of 5. dual-beam pump probe experimental system as claimed in claim 1, it is characterised in that the femtosecond laser light source
System includes Verdi pumping sources (1) and ti∶sapphire laser femto-second laser (2), and the light source of Verdi pumping sources (1) output passes through
Ti∶sapphire laser femto-second laser obtains pulse laser after (2).
A kind of 6. dual-beam pump probe experimental system as claimed in claim 1, it is characterised in that the Verdi pumping sources
(1) power output peak power is 5W, and wavelength is 532nm green glow, and middle cardiac wave is obtained after ti∶sapphire laser femto-second laser (2)
A length of 800nm, repetition rate 82MHz, single pulse width are 30fs pulse laser.
A kind of 7. dual-beam pump probe experimental system as claimed in claim 1, it is characterised in that first beam splitter
(4), the second beam splitter (7) and the 3rd beam splitter (11) are unpolarized beam splitter.
8. a kind of dual-beam pump probe experimental system as claimed in claim 7, it is characterised in that first beam splitter
Splitting ratio is 7:3.
A kind of 9. dual-beam pump probe experimental system as claimed in claim 7, it is characterised in that second beam splitter
(7) and the splitting ratio of the 3rd beam splitter (11) is 1:1.
10. a kind of dual-beam pump probe experimental system as claimed in claim 1, it is characterised in that also including the first reflection
Mirror (3), the pulse laser that the femtosecond laser light source system is sent reflex to the first beam splitter (4) by the first speculum (3).
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| CN201710470834.2A CN107449738A (en) | 2017-06-20 | 2017-06-20 | A kind of dual-beam pump probe experimental system |
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| CN109471265A (en) * | 2018-05-30 | 2019-03-15 | 北京长城融智科技有限公司 | A kind of insensitive focusing alignment methods in the space of dual-beam pumping-detection and system |
| CN108667426B (en) * | 2018-07-10 | 2023-12-22 | 中国工程物理研究院激光聚变研究中心 | Carrier dynamics process measuring device applied to photovoltaic device |
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| CN109632726B (en) * | 2018-12-13 | 2020-10-23 | 中山大学 | Molecular dynamics measurement method and device based on quantum coherent control |
| CN112986140A (en) * | 2019-12-17 | 2021-06-18 | 宁波大学 | Time-resolved imaging system suitable for laser beam shaping and imaging method thereof |
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| CN114543685A (en) * | 2020-11-24 | 2022-05-27 | 深圳中科飞测科技股份有限公司 | Interferometer modulator, measuring system and measuring method |
| CN113075127A (en) * | 2021-03-31 | 2021-07-06 | 深圳中科飞测科技股份有限公司 | Optical path adjusting method, detecting apparatus, and storage medium |
| CN113740265A (en) * | 2021-08-17 | 2021-12-03 | 哈尔滨工业大学（深圳） | Multielement material AnBxC1-xElement ratio detection method |
| CN113740265B (en) * | 2021-08-17 | 2023-08-25 | 哈尔滨工业大学（深圳） | Multielement material A n B x C 1-x Element proportion detection method |
| CN114486687A (en) * | 2022-01-27 | 2022-05-13 | 北京理工大学 | Multi-scale continuous observation feedback method and device for femtosecond laser processing cells |
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Application publication date: 20171208 |