CN206362531U - Synchronous scanning streak camera time resolution force measuring device - Google Patents
Synchronous scanning streak camera time resolution force measuring device Download PDFInfo
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- CN206362531U CN206362531U CN201621366807.8U CN201621366807U CN206362531U CN 206362531 U CN206362531 U CN 206362531U CN 201621366807 U CN201621366807 U CN 201621366807U CN 206362531 U CN206362531 U CN 206362531U
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- streak camera
- spectroscope
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Abstract
The utility model provides a kind of measurement apparatus of synchronous scanning streak camera time sense, it is intended to solve the problem of conventional test methodologies confidence level is poor.The device includes femto-second laser, the first spectroscope, fast diode, beam expanding lens, the second spectroscope, the first speculum, the second speculum and length-measuring interferometer；First spectroscope is arranged on the output light path of femto-second laser, fast diode is arranged on first spectroscopical transmitted light path, beam expanding lens is arranged on first spectroscopical reflected light path, second spectroscope is arranged on the output light path of beam expanding lens, first speculum is arranged on second spectroscopical transmitted light path, and the second speculum is arranged on second spectroscopical reflected light path；Length-measuring interferometer is arranged on the dead astern of the second speculum, for measuring displacement of second speculum along optical path direction where it；Second speculum is double mirror.The utility model can realize the high-acruracy survey of the resolving power of high time resolution synchronous scanning streak camera.
Description
Technical field
The utility model belongs to field of photodetection, is related to the measurement apparatus of streak camera time sense, more particularly to together
The measurement apparatus of step scanning streak camera time sense.
Background technology
Streak camera is the unique high-end scientific measurement and diagnostic equipment for being provided simultaneously with ultrahigh time resolution and high-space resolution
Device, is to realize the necessary means that microcosmic and ultrafast process is detected, is ground for basic front line science research and great original innovation
Study carefully with weight meaning.One kind that synchronous scanning streak camera belongs in streak camera, it can test the instantaneous of weak cycle light field
Change.In the research of many basic science and applied science, such as research of photosynthesis mechanism, exciton migration, electron spin
The research of the processes such as relaxation, electric charge transfer, energy transfer and molecular vibration will be related to the diagnosis of ultrashort dim light phenomenon.It is synchronous
The streak camera of scanning is that caused molecule structure change, electron energy transmission, the complexity of molecular composition, electronics are excited to light
The powerful of proton transfer research.Improved constantly with the Development Level of China's synchronous scanning streak camera, to synchronous scanning
The demarcation of the time sense of streak camera it is also proposed new challenge, the exploration of new scaling method and high-precision caliberating device
Develop very necessary.
Conventional test methodologies：The measurement of synchronous scanning streak camera time sense is typically to be produced using Repetition Frequency Laser device
Burst pulse irradiate streak camera slit, streak camera is gathered striped picture under static mode of operation, then make striped
Camera gathers striped picture in scanning-mode it, compares the change of two groups of striped pictures to obtain the resolving power of streak camera.Due to ring
The influence of many factors such as border background, image quality, circuit noise, time for exposure, or even it sometimes appear that dynamic scan when ratio
The striped that static state is obtained measures the time sense confidence level of the synchronous streak camera of acquisition in this way as narrow phenomenon
Difference.
Utility model content
Based on above-mentioned background, the utility model proposes a kind of measurement of synchronous scanning streak camera time sense dress
Put, to solve the problem of conventional test methodologies confidence level is poor, drastically increase measuring accuracy.
Technical solutions of the utility model are：
The measurement apparatus of synchronous scanning streak camera time sense, it is characterized in that：It include femto-second laser,
First spectroscope, fast diode, beam expanding lens, the second spectroscope, the first speculum, the second speculum and length-measuring interferometer；It is described
First spectroscope is arranged on the output light path of femto-second laser, and fast diode is arranged on first spectroscopical transmitted light path,
Beam expanding lens is arranged on first spectroscopical reflected light path, and the second spectroscope is arranged on the output light path of beam expanding lens, and first is anti-
Penetrate mirror to be arranged on second spectroscopical transmitted light path, the second speculum is arranged on second spectroscopical reflected light path；Survey length
Interferometer is arranged on the second speculum dead astern, for measuring displacement of second speculum along optical path direction where it；Institute
The second speculum is stated for double mirror；During measurement, the fast diode is connected with streak camera to be measured, to be measured for triggering
Measure streak camera；The beam expanding lens is expanded femtosecond laser beam, laser beam is covered streak camera slit；Described second point
The position of light microscopic is immediately ahead of the slit of streak camera to be measured, it is ensured that anti-through the first speculum again after the second spectroscope beam splitting
Penetrate the two-beam pulse train formed after being reflected with the second speculum and enter streak camera slit to be measured；；The pulse train
Time interval as second speculum is moved along optical path direction where it and is changed；The time interval of the pulse train
Change measures indirect gain by length-measuring interferometer.
Photoisolator is provided with light path between above-mentioned femto-second laser and the first spectroscope, to prevent laser defeated
The laser gone out return laser light device after subsequent optical element causes laser to damage.
Be provided with wave plate in light path between above-mentioned second spectroscope and the first speculum, the purpose that wave plate is set be in order to
Improve the polarization direction of homologous laser beam, prevent beam interference, further to improve measurement accuracy.
The method one of synchronous scanning streak camera time sense is tested using above-mentioned measurement apparatus, its special character exists
In：Comprise the following steps：
1) pulse laser that the femto-second laser output pulse period is T is opened；
2) the pulse laser mirror is after the first spectroscope light splitting, and transmitted light injects fast diode, triggers striped to be measured
Camera；Reflected light forms the directional light of collimation after beam expanding lens；
3) directional light is divided into two beams after the second spectroscope：Transmitted light by the first speculum from after quasi-reflection again through institute
State and enter streak camera slit to be measured after the second dichroic mirror；Reflected light through the second speculum from quasi-reflection after, enter again
Enter the second spectroscope, streak camera slit to be measured is also entered after being transmitted through the second spectroscope；It is narrow into streak camera to be measured
This two beams laser two group pulse sequences of formation of seam；
4) the second speculum is moved along light path where the second speculum, the time interval for making the two group pulses sequence is t,
The position of now the second speculum is designated as initial position；
5) the second speculum is moved along light path where the second speculum, relative to initial position, the movement of the second speculum
When distance is Δ L, the time interval is t', and the variable quantity of corresponding time interval is Δ t, Δ t=| the Δ L/c of t-t'|=2,
In formula, c is the light velocity；
6) moving step length of the second speculum is constantly adjusted, while using streak camera to be measured under dynamic scan pattern
The time interval variation delta t before and after the movement of the second speculum is measured, until streak camera to be measured can just be differentiated, it is now right
The variable quantity for the time interval answered is the time sense of streak camera to be measured.
Above-mentioned steps 5) in the displacement Δ L of the second speculum measured by length-measuring interferometer.
During measurement, the time interval t of pulse train corresponding to above-mentioned initial position is demarcated in advance.
The method two of synchronous scanning streak camera time sense is tested using above-mentioned measurement apparatus, it is characterised in that：
Comprise the following steps：
1) pulse laser that the femto-second laser output pulse period is T is opened；
2) the pulse laser mirror is after the first spectroscope light splitting, and transmitted light injects fast diode, triggers striped to be measured
Camera；Reflected light forms the directional light of collimation after beam expanding lens；
3) directional light is divided into two beams after the second spectroscope：After transmitted light is transmitted through wave plate, by the first speculum certainly
The wave plate is again passed through after quasi-reflection, most enters streak camera slit to be measured after second dichroic mirror afterwards；Instead
Penetrate light through the second speculum from quasi-reflection after, be again introduced into the second spectroscope, through the second spectroscope transmit after also enter it is to be measured
Streak camera slit；Into this two beams laser two group pulse sequences of formation of streak camera slit to be measured；
4) the second speculum is moved along the light path of the second speculum, the time interval for making the two group pulses sequence is t, will
Now the position of the second speculum is designated as initial position；
5) move the second speculum along the light path of the second speculum, relative to initial position, the movement of the second speculum away from
During from for Δ L, the time interval is t', and the variable quantity of corresponding time interval is Δ t, Δ t=| the Δ L/c of t-t'|=2, formula
In, c is the light velocity；
6) moving step length of the second speculum is constantly adjusted, while using streak camera to be measured under dynamic scan pattern
The time interval variation delta t before and after the movement of the second speculum is measured, until can just to differentiate second anti-for streak camera to be measured
The moving step length of mirror is penetrated, now the variable quantity of corresponding time interval is the time sense of streak camera to be measured.
Above-mentioned steps 5) in the displacement Δ L of the second speculum measured by length-measuring interferometer.
During measurement, the time interval t of pulse train corresponding to above-mentioned initial position is demarcated in advance.
The utility model has the advantages that：
1st, the utility model is by homologous laser light splitting, producing two laser pulse sequences, passing through the second speculum
The movement of (double mirror) adjusts the light path of two light paths, so that the pulse spacing of two laser pulse sequences constantly becomes
Change, and accurately control by length-measuring interferometer the variable quantity of light path, and then obtain the variable quantity in two pulse spacings.Due to surveying length
The precision of interferometer can be controlled in micron dimension, so the variable quantity in two pulse spacings can be controlled in femtosecond magnitude.In addition, this
The pulse spacing of two pulse train can be more than the pulsewidth of laser in utility model, effectively reduce laser pulsewidth pair itself
The influence of measurement result, making the time sense of femtosecond magnitude can realize, can realize high time resolution synchronous scanning striped phase
The high-acruracy survey of the resolving power of machine.
2nd, the utility model is effectively improved homologous sharp by setting wave plate between the second spectroscope and the first speculum
The polarization direction of light beam, prevents from interfering with each other between different light beams, further increases the precision of measurement.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model；
In figure：1- femto-second lasers, 2- photoisolators, the spectroscopes of 3- first, the fast diodes of 4-, 5- beam expanding lens, 6-
Two spectroscopes, the speculums of 7- first, 8- wave plates, the speculums of 9- second, 10- length-measuring interferometers, 11- streak cameras.
Fig. 2 is the schematic diagram of the pulse laser produced by femto-second laser；
Fig. 3 is the schematic diagram of two group pulse sequences produced by the utility model；
In figure：T is the repetition cycle of femto-second laser, the time interval of pulse trains of the t produced by the utility model.
Embodiment
As shown in figure 1, the measurement apparatus of synchronous scanning streak camera time sense provided by the utility model includes
Femto-second laser 1, photoisolator 2, the first spectroscope 3 and fast diode 4 in same light path are successively set on, along first point
The reflected light path of light microscopic 3 is disposed with beam expanding lens 5, the second spectroscope 6, the speculum 7 of wave plate 8 and first, and along second point
The reflected light path of light microscopic 6 is disposed with the second speculum 9 and length-measuring interferometer 10.Wherein the second speculum 9 is double-sided reflecting
Mirror, length-measuring interferometer 10 is used to measure displacement of second speculum 9 along optical path direction where it.
When being measured using the present apparatus, fast diode 4 is connected with the frequency multiplier of streak camera 11 to be measured, is used for
Trigger streak camera to be measured；The position for adjusting the second spectroscope 6 is located at immediately ahead of the slit of streak camera 11 to be measured,
Ensure the two-beam pulse train formed after being reflected after the beam splitting of the second spectroscope 6 through the reflection 7 of the first speculum and the second speculum 9
Into the slit of streak camera to be measured.
Operation principle of the present utility model is：
The utility model utilizes the combination of femto-second laser, photoisolator, spectroscope and speculum etc., to change two-way
Enter light path during streak camera scanning slit to be measured with source laser, so as to produce the two-way femtosecond pulse at different time interval
Laser sequence；By constantly adjusting mobile second speculum, while being surveyed using streak camera to be measured under dynamic scan pattern
Flow control two-mirror 9 moves front and rear time interval changes delta t, when streak camera can just differentiate the movement of the second speculum 9
During step-length, corresponding time interval change is the time sense of streak camera to be measured.
The utility model tests synchronous scanning streak camera time sense there is provided based on above-mentioned measurement apparatus simultaneously
Method, comprises the following steps：
1) femto-second laser is opened, the output pulse period is T pulse laser, as shown in Figure 2；
2) after the pulse laser mirror is coupled through photoisolator 2, the light splitting of the first spectroscope 3 is passed through：Transmitted light injection is fast
Diode 4, triggers streak camera 11 to be measured；Reflected light forms the directional light of collimation after beam expanding lens 5；
3) directional light is divided into two beams after the second spectroscope 6：After transmitted light is transmitted through wave plate 8, then by the first reflection
Mirror 7 is again passed through wave plate 8 from after quasi-reflection, enters streak camera slit to be measured after most being reflected afterwards through the second spectroscope 6；Reflection
Light through the second speculum 9 from quasi-reflection after, be again introduced into the second spectroscope 6, also enter to be measured after being transmitted through the second spectroscope 6
Streak camera slit；This two beams laser into streak camera slit to be measured forms two pulses sequence, as shown in Figure 3；
4) the second speculum is moved along the light path of the second speculum 9, the time interval for making the two pulses sequence is t
(being demarcated in advance to t), initial position is designated as by the position of now the second speculum；
5) move the second speculum along the light path of the second speculum, relative to initial position, the movement of the second speculum away from
During from for Δ L (Δ L is accurately measured by length-measuring interferometer), the time interval is t', the variable quantity of corresponding time interval
For Δ t, Δ t=| in the Δ L/c of t-t'|=2, formula, c is the light velocity；
6) moving step length of the second speculum is constantly adjusted, while using streak camera to be measured under dynamic scan pattern
The time interval variation delta t before and after the movement of the second speculum is measured, until streak camera to be measured can just be differentiated, it is now right
The variable quantity for the time interval answered is the time sense of streak camera to be measured.
Claims (3)
1. the measurement apparatus of synchronous scanning streak camera time sense, it is characterised in that：Including femto-second laser, the first light splitting
Mirror, fast diode, beam expanding lens, the second spectroscope, the first speculum, the second speculum and length-measuring interferometer；
First spectroscope is arranged on the output light path of femto-second laser, and fast diode is arranged on first spectroscopical transmission
In light path, beam expanding lens is arranged on first spectroscopical reflected light path, and the second spectroscope is arranged on the output light path of beam expanding lens,
First speculum is arranged on second spectroscopical transmitted light path, and the second speculum is arranged on second spectroscopical reflected light path
On；Length-measuring interferometer is arranged on the dead astern of the second speculum, for measuring shifting of second speculum along optical path direction where it
Dynamic distance；Second speculum is double mirror；
During measurement, the fast diode is connected with streak camera to be measured, for triggering streak camera to be measured；Described second point
Light microscopic is located at the front of streak camera slit to be measured, it is ensured that through the first speculum reflection and the after the second spectroscope beam splitting
The two-beam pulse train formed after two-mirror reflection enters streak camera slit to be measured；The interval of the pulse train leads to
Second speculum is crossed to move and change along optical path direction where it；The time interval variable quantity of the pulse train is by surveying
Long interferometer measurement is obtained.
2. the measurement apparatus of synchronous scanning streak camera time sense according to claim 1, it is characterised in that：It is described
Photoisolator is provided with light path between femto-second laser and the first spectroscope.
3. the measurement apparatus of synchronous scanning streak camera time sense according to claim 1 or 2, it is characterised in that：
Wave plate is provided with light path between the second spectroscope and the first speculum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621366807.8U CN206362531U (en) | 2016-12-13 | 2016-12-13 | Synchronous scanning streak camera time resolution force measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621366807.8U CN206362531U (en) | 2016-12-13 | 2016-12-13 | Synchronous scanning streak camera time resolution force measuring device |
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| CN206362531U true CN206362531U (en) | 2017-07-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201621366807.8U Withdrawn - After Issue CN206362531U (en) | 2016-12-13 | 2016-12-13 | Synchronous scanning streak camera time resolution force measuring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106644408A (en) * | 2016-12-13 | 2017-05-10 | 中国科学院西安光学精密机械研究所 | Synchronous scanning streak camera temporal resolution measuring device and method |
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2016
- 2016-12-13 CN CN201621366807.8U patent/CN206362531U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106644408A (en) * | 2016-12-13 | 2017-05-10 | 中国科学院西安光学精密机械研究所 | Synchronous scanning streak camera temporal resolution measuring device and method |
| CN106644408B (en) * | 2016-12-13 | 2023-01-06 | 中国科学院西安光学精密机械研究所 | Device and method for measuring time resolution of synchronous scanning stripe camera |
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| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
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| AV01 | Patent right actively abandoned |
Granted publication date: 20170728 Effective date of abandoning: 20230106 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20170728 Effective date of abandoning: 20230106 |