CN207180883U - A kind of device for measuring optical phase put-off in ultrafast laser pump probe system - Google Patents
A kind of device for measuring optical phase put-off in ultrafast laser pump probe system Download PDFInfo
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- CN207180883U CN207180883U CN201720548320.XU CN201720548320U CN207180883U CN 207180883 U CN207180883 U CN 207180883U CN 201720548320 U CN201720548320 U CN 201720548320U CN 207180883 U CN207180883 U CN 207180883U
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Abstract
The utility model belongs to optical material technical field, discloses a kind of device for measuring optical phase put-off in ultrafast laser pump probe system, including：Femto-second laser；First light-splitting device；First speculum；Precise electric control platform；Precise electric control platform moving track；Second speculum；3rd speculum；First beam-expanding system；Second light-splitting device；4th speculum；Second beam-expanding system；Unbiased Amici prism；First CCD；First analyzer；First quarter wave plate；Second quarter wave plate；Second analyzer；2nd CCD；3rd quarter wave plate；3rd analyzer；3rd CCD；Computer.The utility model not only can be more avoided that as the measurement error caused by active phase shift to realizing measurement in real time and effectively control to detection light time delay in ultrafast laser pump probe.
Description
Technical field
The utility model belongs in optical material technical field, more particularly to a kind of measurement ultrafast laser pump probe system
The device of optical phase put-off.
Background technology
With reaching its maturity for the rapid development of laser pulse technology, especially femtosecond laser technology, ultrashort laser pulse
It is widely used in physics, chemistry, biology, medicine and other fields, and has gradually formed novel crossed subject.Wherein ultrashort pulse pump
TIME RESOLVED TECHNIQUE of the Pu-Detection Techniques as research ultra-fast dynamics process, it is widely used in the wink of various ultrafast processes
When detection and diagnosis, the fracture of such as chemical bond and generation, be increasingly becoming in many ultrafast processes and carry out time discrimination measurement
Important method.In ultrafast pulse pumping-detection technology, the time delay for detecting light and flashlight is typically moved by electric precise
The spatial movement of moving platform causes two-beam to produce certain optical path difference, and so as to realize, still, detection light is produced with flashlight
Raw time delay is but and not exclusive as caused by the deferred mount, and light will also result in light path in the transmitting procedure of component
Difference.How it is convenient and swift and it is accurate measurement ultrafast laser pump probe during real-time phase it is poor, will a more step essence
True measurement result, improve analysis precision.
In summary, the problem of prior art is present be：Prior art, not using being polarized in optical phase measurement technology
Phase-shifting interference measuring principle carries out detecting light and optics caused by flashlight during real-time testing ultrafast pulse pumping-detection
Phase delay.
The content of the invention
The problem of existing for prior art, the utility model are provided in a kind of measurement ultrafast laser pump probe system
The device of optical phase put-off.
The utility model is achieved in that a kind of dress for measuring optical phase put-off in ultrafast laser pump probe system
Put, the laser that the femto-second laser of the device of optical phase put-off passes through transmitting in the measurement ultrafast laser pump probe system
Beam enter on the right side of the femto-second laser by laser beam beam splitting for different polarization direction laser beam A and laser beam B first
Light-splitting device；The laser beam A of first light-splitting device enters the first speculum；The laser beam that first speculum projects
A enters precise electric control platform；The laser beam A that the precise electric control platform reflects enters the second speculum；Second reflection
The laser beam A that mirror projects enters the 3rd speculum；The laser beam A that 3rd speculum projects enters positioned at the 3rd reflection
The first beam-expanding system immediately below mirror；The laser beam A that first beam-expanding system projects enters the second light-splitting device；
The 4th speculum that the laser beam B enters below the first light-splitting device；Enter back into and be located at the 4th speculum
Second beam-expanding system on right side；The second light-splitting device is entered back into laser beam A to converge；
Laser beam A and laser beam B after converging enter unbiased Amici prism；The mixing reflected through unbiased Amici prism swashs
Light beam respectively enters the first quarter wave plate positioned at unbiased Amici prism left side, right side and lower section, the second quarter wave plate, the 3rd 1/4
Wave plate；
The mixing laser beam that first quarter wave plate projects also sequentially enters the first analyzer, the first CCD；
The mixing laser beam that second quarter wave plate projects also sequentially enters the second analyzer, the 2nd CCD；
The mixing laser beam that 3rd quarter wave plate projects also sequentially enters the 3rd analyzer 20, the 3rd CCD；
The mixing laser beam that first CCD, the 2nd CCD, the 3rd CCD are projected enters computer.
Further, the unbiased Amici prism is provided with the unbiased light splitting deielectric-coating of three light splitting surface platings；Described three points
The unbiased of smooth surface plating is divided deielectric-coating respectively in the left side, right side and lower section for being embedded in unbiased Amici prism.
Further, the precise electric control platform is slidably connected in precise electric control platform moving track in the vertical direction.
The advantages of the utility model and good effect are：
The utility model is ultrafast using phase-shifting interference measuring principle progress real-time testing is polarized in optical phase measurement technology
Light and optical phase put-off caused by flashlight are detected in pulse pump-detection process.
The utility model not only can in ultrafast laser pumping-detection to detection light time delay realize in real time measurement and
Effectively control, is more avoided that as the measurement error caused by active phase shift.
Brief description of the drawings
Fig. 1 is the dress of optical phase put-off in the measurement ultrafast laser pump probe system that the utility model embodiment provides
Put schematic diagram.
In figure：1st, femto-second laser；2nd, the first light-splitting device；3rd, the first speculum；4th, precise electric control platform；5th, accurate electricity
Control platform moving track；6th, the second speculum；7th, the 3rd speculum；8th, the first beam-expanding system；9th, the second light-splitting device；10th,
Four speculums；11st, the second beam-expanding system；12nd, unbiased Amici prism；13rd, the first CCD；14th, the first analyzer；15th, the one 1/4
Wave plate；16th, the second quarter wave plate；17th, the second analyzer；18th, the 2nd CCD；19th, the 3rd quarter wave plate；20th, the 3rd analyzer；21、
3rd CCD；22nd, computer.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, with reference to embodiments, to this
Utility model is further elaborated.It should be appreciated that specific embodiment described herein is only explaining this practicality
It is new, it is not used to limit the utility model.
Structure of the present utility model is explained in detail below in conjunction with the accompanying drawings.
As shown in figure 1, optical phase is prolonged in the measurement ultrafast laser pump probe system that the utility model embodiment provides
Slow device, femto-second laser 1 send laser beam, by after the light-splitting device 2 on the right side of femto-second laser 1, becoming
Laser beam with different polarization direction, and laser beam is divided into laser beam A and laser beam B, laser beam A is sent out along with LASER Light Source
The laser beam identical direction gone out is transmitted；After the first speculum 3 on the right side of light-splitting device 2, into precision
Electric control platform 4, and produce and moved with the phase after laser beam B delay, precise electric control platform 4 according to precise electric control platform in figure 1
The above-below direction of dynamic rail road 5 moves, then the laser beam A after delay passes through the second reflection positioned at the lower section of precise electric control platform 4
Mirror 6, then by the 3rd speculum 7 on the right side of the second speculum, expanded into first immediately below the 3rd speculum 7
System 8, the second light-splitting device 9 is entered, is converged with laser beam B.Laser beam B is after light-splitting device 2 by positioned at optical splitter
4th speculum 10 of the lower section of part 2, by the second beam-expanding system 11 positioned at the right side of the 4th speculum 10, converges with laser beam A
In the second light-splitting device 9.
Laser beam A and laser beam B after converging have different polarization directions, and transmission direction is identical, and process is special
Unbiased Amici prism 12, is respectively enterd through the unbiased light splitting deielectric-coating reflection with the plating of three light splitting surfaces, positioned at special nothing
First quarter wave plate 15, the first analyzer 14, the first CCD13 in the inclined left side of Amici prism 12, right side and lower section, the second quarter wave plate
16th, the second analyzer 17, the 2nd CCD18, the 3rd quarter wave plate 19, the 3rd analyzer 20, the 3rd CCD21.
Computer 22 is received by the first CCD13, the 2nd CCD18, and the laser energy collected by the 3rd CCD21 is simultaneously counted
Calculate analyzing and processing.
With reference to operation principle, the utility model will be further described.
A branch of femtosecond laser that the utility model embodiment provides is sent by laser, will be swashed after a light-splitting device
Light is divided into the orthogonal two beams polarization laser in direction, respectively laser beam A and laser beam B, and laser beam A passes through as detection light
Enter precise electric control platform after first speculum, after producing phase delay, by the second speculum, the 3rd speculum, after pass through
The first beam-expanding system is crossed to expand.Laser beam B after light-splitting device by, by the 4th speculum, entering back into the expansion of the second beam-expanding system
Beam, into the second light-splitting device, converge with laser beam A.
Laser beam A after converging enters special unbiased Amici prism, the special unbiased Amici prism with laser beam B
Three light splitting surfaces are coated with unbiased light splitting deielectric-coating respectively.By the laser beam A after three reflective surfaces and laser beam B by the 1st
Wave plate, the first analyzer and the first CCD, the second quarter wave plate, the second analyzer and the 2nd CCD, the 3rd quarter wave plate, the 3rd analyzing
Device and the 3rd CCD are received, and read corresponding luminous power by CCD, are transferred into computer, by computer analysis mode meter
Calculate, draw actual phase retardation caused by two-beam.
For the feasibility of the apparent proof present apparatus, and the computational methods of produced phase delay, the present apparatus is managed
It is described below by simplicity is calculated：
The refractive index of light-splitting device upper and lower interface is different in Tthe utility model system, it is contemplated that two-beam transmitting procedure
In half-wave loss, draw two-beam reflection matrix and projection matrix it is as follows：
It is the phase entrained by test light to be measured, as laser beam A and the phase difference of laser beam B to make Φ.Incident beam
Light intensity is I0。
Then according to the electric vector principle of light, flashlight can be calculated and detect the interference strength of light：
Similarly, other a few beam laser interference light intensity I can be calculated2、I3、I4It is as follows：
(4)-(7) formula is utilized, the expression formula that pump light can be calculated and detect the phase difference of light is：
Especially, unbiased Amici prism special in system, three light splitting surfaces be coated with respectively unbiased light splitting deielectric-coating, three
Face is reflected and projection coefficient is respectively r1、r2、r3；t1、t2、t3。
And：
r1t2=t1r3=t1t3 (9)
The minimum time resolution ratio that a kind of measurement apparatus that the utility model is introduced can be calculated is measured up to Ah second
Level, it is much higher than the resolution ratio of time delay line, it can not only fully meet in ultrafast laser pump-and-probe technique to visiting
The real―time precision measurment of light-metering retardation and effectively control, more can provide strong guarantee for the precision analysis of result of detection.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
All any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (3)
1. a kind of device for measuring optical phase put-off in ultrafast laser pump probe system, it is characterised in that the measurement is super
The femto-second laser of the device of optical phase put-off is entered positioned at winged by the laser beam of transmitting in fast laser pump (ing) detection system
On the right side of second laser is the laser beam A in different polarization direction and the first light-splitting device of laser beam B by laser beam beam splitting；It is described
The laser beam A of first light-splitting device enters the first speculum；The laser beam A that first speculum projects enters precise electric control
Platform；The laser beam A that the precise electric control platform reflects enters the second speculum；The laser that second speculum projects
Beam A enters the 3rd speculum；The laser beam A that 3rd speculum projects enters first be located at immediately below the 3rd speculum
Beam-expanding system；The laser beam A that first beam-expanding system projects enters the second light-splitting device；
The 4th speculum that the laser beam B enters below the first light-splitting device；Enter back on the right side of the 4th speculum
The second beam-expanding system；The second light-splitting device is entered back into laser beam A to converge；
Laser beam A and laser beam B after converging enter unbiased Amici prism；The mixing laser beam reflected through unbiased Amici prism
Respectively enter the first quarter wave plate, the second quarter wave plate, the 3rd quarter wave plate positioned at unbiased Amici prism left side, right side and lower section；
The mixing laser beam that first quarter wave plate projects also sequentially enters the first analyzer, the first CCD；
The mixing laser beam that second quarter wave plate projects also sequentially enters the second analyzer, the 2nd CCD；
The mixing laser beam that 3rd quarter wave plate projects also sequentially enters the 3rd analyzer 20, the 3rd CCD；
The mixing laser beam that first CCD, the 2nd CCD, the 3rd CCD are projected enters computer.
2. measuring the device of optical phase put-off in ultrafast laser pump probe system as claimed in claim 1, its feature exists
In the unbiased Amici prism is provided with the unbiased light splitting deielectric-coating of three light splitting surface platings；The unbiased of three light splitting surfaces plating
Deielectric-coating is divided respectively in the left side, right side and lower section for being embedded in unbiased Amici prism.
3. measuring the device of optical phase put-off in ultrafast laser pump probe system as claimed in claim 1, its feature exists
In the precise electric control platform is slidably connected in precise electric control platform moving track in the vertical direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720548320.XU CN207180883U (en) | 2017-05-17 | 2017-05-17 | A kind of device for measuring optical phase put-off in ultrafast laser pump probe system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720548320.XU CN207180883U (en) | 2017-05-17 | 2017-05-17 | A kind of device for measuring optical phase put-off in ultrafast laser pump probe system |
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| Publication Number | Publication Date |
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| CN207180883U true CN207180883U (en) | 2018-04-03 |
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ID=61733562
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720548320.XU Active CN207180883U (en) | 2017-05-17 | 2017-05-17 | A kind of device for measuring optical phase put-off in ultrafast laser pump probe system |
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| CN (1) | CN207180883U (en) |
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2017
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Effective date of registration: 20200106 Address after: 100190 Beijing City, Haidian District Zhongguancun Road, No. 15 (three) No. 75 Building No. 214 Patentee after: Beijing the Great Wall New Technology Co. Ltd. Address before: No. 603, building 8, xinkexiangyuan, Zhongguancun, Haidian District, Beijing 100190 Patentee before: Sun Shiming |
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| TR01 | Transfer of patent right |