CN204188637U - A kind of scanning Frequency Domain Interferometer - Google Patents
A kind of scanning Frequency Domain Interferometer Download PDFInfo
- Publication number
- CN204188637U CN204188637U CN201420658724.0U CN201420658724U CN204188637U CN 204188637 U CN204188637 U CN 204188637U CN 201420658724 U CN201420658724 U CN 201420658724U CN 204188637 U CN204188637 U CN 204188637U
- Authority
- CN
- China
- Prior art keywords
- pulse
- partially reflecting
- frequency domain
- reflecting mirror
- interferometer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Spectrometry And Color Measurement (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The utility model provides a kind of scanning Frequency Domain Interferometer, and described interferometer contains wideband pulse, pulse stretcher, partially reflecting mirror, beam splitting chip, sample, plane mirror, spectrometer and streak camera.Wideband pulse broadening is linear-chirped-pulse by described pulse stretcher, and described linear-chirped-pulse produces the pulse train of a constant duration by optics vibration chamber, and described optics vibration chamber is made up of two pieces of partially reflecting mirrors; Described beam splitting chip, plane mirror and sample surface forms unequal arm Michelson interferometer; Described spectrometer and streak camera are used for dispersion chirped pulse and record frequency spectrum interference striped respectively.The utility model scanning Frequency Domain Interferometer can measure the physical amount change history of large time scale in single-shot experiment, measures the feature with high time resolution.The feature of scanning Frequency Domain Interferometer of the present utility model shows that it can be used as duration length, feature locations changes fast physical quantity test macro.
Description
Technical field
The utility model belongs to ultra-fast optical measuring technology, is specifically related to a kind of scanning Frequency Domain Interferometer.
Background technology
Material kinetics performance under the effect of research strong shock wave is one of the hot issue in Material Physics field.By measuring by the shock velocity in impact material and particle rapidity, contribute to the stress-strain state of derivation material and the theoretical model (laser interference velocity measuring technique, National Defense Industry Press, Hu Shaolou) of inspection material condition.Wherein, the measurement of particle rapidity adopts free surface velocity method usually, and conventional diagnostic device has the test macros such as the velocity interferometer of any reflecting surface (VISAR), ultrafast microinterferometer, Frequency Domain Interferometer (FDI) and chirped pulse Frequency Domain Interferometer (CPSI).
VISAR is generally applied in Long Pulse LASER and drives in the experiments of measuring of shock wave, the time scale of its diagnosis physical quantity is in ns magnitude, but time resolution is (Line-imaging velocimeter for shock diagnostics at the OMEGA laser facility in the level of tens of ps usually, Rev. Sci. Instrum., P. M. Celliers, D. K. Bradley, G. W. Collins, D. G. Hicks, T. R. Boehly and W. J. Armstrong), if physical quantity is very fast in the change of some ad-hoc location, test result can not reflect the details of change.Comparatively speaking, ultrafast microinterferometer and FDI belong to ultrafast measurement technology, the physical quantity variation of fs time scale can be reflected, measure the common methods that femtosecond laser drives shock wave, but, both belong to discrete type point measuring technology, when measuring the physical quantity variation within the scope of certain hour, needing to carry out a large amount of experiments sends out secondary, therefore higher (Single-shot measurement of temporal phase shifts by frequency-domain holography is required to the repeatability of experiment condition, Opt. Lett., S. P. Le Blanc, E. W. Gaul, N. H. Matlis, A. Rundquist, and M. C. Downer).
CPSI refers to be first linear-chirped-pulse by a branch of wideband pulse broadening, then the two pulses with certain delay-time difference is produced by unequal arm Michelson interferometer or Mach-Zehnder interferometer, their (at least a branch of propagation load upper measured signal) last enter spectrometer in the mode of co-axial propagation, frequency spectrum interference striped is formed, by time dependent measured signal can be obtained to striped spectrum unscrambling in register system.CPSI is a kind of single-shot experiment measuring technology developed on FDI basis, it utilizes the chirping characteristics of linear-chirped-pulse, achieve combination (the Single-shot chirped-pulse spectral interferometry used to measure the femtosecond ionization dynamics of air of high time resolution and follow-on test, Opt. Lett., C. Y. Chien, B. La Fontaine, A. Desparois, Z. Jiang, T. W. Johnston, J. C. Kieffer, H. P ' epin, and F. Vidal), thus can implement effectively to measure to fast-changing physical quantity (as laser-driven shock wave rising edge).Regrettably, it is a kind of relation of mutual restriction between the single-shot Measuring Time yardstick of CPSI and time resolution, when the time scale that single-shot is measured increases, appearance declines by corresponding time resolution, this is long for the duration, feature locations changes fast physical quantity test, still needs multiple experiment just can complete.
Summary of the invention
The technical problems to be solved in the utility model is to provide a kind of scanning Frequency Domain Interferometer, is applied to duration long, feature locations and changes fast physical quantity test.Scanning Frequency Domain Interferometer of the present utility model, has the testing feature of wide range and high time resolution simultaneously, all completes in single-shot experiment, avoid the impact that experiment condition change produces test result to the measurement of physical amount change history.
For achieving the above object, the utility model provides following technical scheme:
Scanning Frequency Domain Interferometer of the present utility model, comprising:
Wideband pulse, pulse stretcher, partially reflecting mirror, beam splitting chip, sample, plane mirror, spectrometer and streak camera.
The transmitting procedure of light beam is, first a branch of wideband pulse passes through pulse stretcher, then impinge perpendicularly on two pieces of partially reflecting mirrors successively, wherein, the reflected light of partially reflecting mirror I returns along former road, transmitted light then impinges perpendicularly on partially reflecting mirror II, reflected light oscillation transmission in the vibration chamber that two pieces of partially reflecting mirrors are formed of partially reflecting mirror II, transmitted light is then divided into transmitted pulse and reflected impulse when propagating through beam splitting chip, transmittance and reflectance pulse impinges perpendicularly on plane mirror and sample surface respectively, after vertical reflection, two pulses second time is by realizing during beam splitting chip coaxially closing bundle, then spectrometer and streak camera is entered successively.
In technique scheme, described wideband pulse is femto-second laser pulse or super continuous impulse, and pulse bandwidth is not less than 10 nm.
Alternatively, described pulse stretcher is the one in grating stretcher, dispersive glass or other optical dispersion element.
Wideband pulse broadening is linear-chirped-pulse by described pulse stretcher, and linear-chirped-pulse is the pulse that pulsed frequency changes linearly over time; Change the parameter of pulse stretcher, the adjustment to described linear-chirped-pulse pulsewidth can be realized.
Reflectivity and the transmissivity of described partially reflecting mirror I, partially reflecting mirror II are respectively 90%, 10%.
Described partially reflecting mirror I and partially reflecting mirror II form an optics vibration chamber; Vertically input a pulse from the one end in optics vibration chamber, the other end is coaxial output pulse train then; In pulse train, the optical path difference of adjacent pulse equals the long twice in optics vibration chamber, chamber, namely in pulse train, the time interval of adjacent pulse equals light in vibration intracavity round trip time once used, therefore, relative distance between changing section catoptron I and partially reflecting mirror II, can realize the adjustment at adjacent pulse interval in pulse train.
The splitting ratio of described beam splitting chip is 1:1, and beam splitting chip, plane mirror form unequal arm Michelson interferometer together with sample surface; When a pulse train input unequal arm Michelson interferometer, export as there is fixed delay time difference and two of co-axial propagation pulse trains, their energy sum is the half of input pulse sequence energy, second half energy returns the incident direction of input pulse sequence, be not utilized, wherein, the pulse train on experience sample surface is detection light, and the pulse train of experience plane mirror is reference light.
The effect of described spectrometer and streak camera is that dispersion enters optical pulse wherein and records the frequency spectrum interference striped produced respectively; Frequency spectrum interference striped interferes generation by the frequency domain between reference light and detection light, interference fringe direction is parallel to the spectrum axle of spectrometer and the solid axes of streak camera, in addition, interference fringe periodically occurs at certain intervals along the time-axis direction of streak camera, and the time span of interval representative equals the adjacent pulse interval in pulse train; Usage data handling procedure carries out spectrum unscrambling to frequency spectrum interference striped, can obtain the movement velocity on sample surface; The minimum time of systematic survey is distinguished as, and in formula, being the Fourier transform extreme pulse widths of wideband pulse, is the pulsewidth of linear-chirped-pulse, and the testing range of system equals scope writing time of streak camera.
The purpose of this utility model is achieved in that a branch of wideband pulse is linear-chirped-pulse by pulse stretcher broadening; An optics vibration chamber is formed by partially reflecting mirror I and partially reflecting mirror II, linear-chirped-pulse enters wherein from one end (partially reflecting mirror I side), and the other end (partially reflecting mirror II side) in optics vibration chamber exports an equally spaced chirped pulse sequence; Beam splitting chip, plane mirror and sample surface forms unequal arm Michelson interferometer, chirped pulse sequence imports unequal arm Michelson interferometer by beam splitting chip, export as there is fixed delay time difference and two of co-axial propagation chirped pulse sequences, be respectively reference light and detection light, wherein, when sample surfaces is moved by impacting because of sample, according to Doppler's principle, will with movable information by the detecting light beam of its reflection; After two chirped pulse sequences continue to spread into spectrometer, by its dispersion, then recorded the frequency spectrum interference striped formed between two pulse trains by streak camera, frequency spectrum interference striped periodically occurs at certain intervals along the time-axis direction of streak camera; By carrying out spectrum unscrambling to frequency spectrum interference striped, the high time resolution velocity variations history of derived sample surface within the scope of large time scale.
Compared with the velocity interferometer (VISAR) of existing any reflecting surface or chirped pulse Frequency Domain Interferometer (CPSI), technique scheme has the following advantages:
1, scanning Frequency Domain Interferometer of the present utility model, relative to VISAR, can change fast physical quantity to feature locations and effectively measure.
2, scanning Frequency Domain Interferometer of the present utility model, relative to CPSI, can by the physical amount change history in the wider time range of single-shot experiment measuring.
Accompanying drawing explanation
Fig. 1 is the scanning Frequency Domain Interferometer fundamental diagram in the utility model embodiment 1;
Fig. 2 is the scanning Frequency Domain Interferometer fundamental diagram that in the utility model embodiment 2, picosecond laser drives shock wave free surface velocity to measure.
Wherein: 1. wideband pulse 2. pulse stretcher 3. partially reflecting mirror I 4. partially reflecting mirror II 5. sample 6. beam splitting chip I 7. plane mirror I 8. spectrometer 9. streak camera 10. femto-second laser 11. beam splitting chip II 12. grating stretcher 13. plane mirror II 14. plane mirror III 15. plane mirror IV 16. plane mirror V 17. plane mirror VI 18. lens 19. plane mirror VII.
Embodiment
For enabling above-mentioned purpose of the present utility model, feature and advantage become apparent more, are described in detail embodiment of the present utility model below in conjunction with accompanying drawing.
Set forth a lot of detail in the following description so that fully understand the utility model, but the utility model can also adopt and be different from alternate manner described here to implement, those skilled in the art can when doing similar popularization without prejudice to when the utility model intension, and therefore the utility model is by the restriction of following public specific embodiment.
embodiment 1
Shown in Fig. 1, one scanning Frequency Domain Interferometer of the present utility model, peripherals surpasses the super continuous impulse that continuous pulse laser exports wide spectral range 400 ~ 2000 nm, after peripheral optical component tape pass filter, super continuous impulse is filtered into the wideband pulse 1 of centre wavelength 800 nm, bandwidth 40 nm; Utilize pulse stretcher 2 to be linear-chirped-pulse by wideband pulse broadening, the pulsewidth of chirped pulse is 200 ps.Linear-chirped-pulse impinges perpendicularly on partially reflecting mirror I 3, and wherein, the incident light of 90% returns along former road, remains 10% transmissive; When transmitted light beam impinges perpendicularly on partially reflecting mirror II 4,10% transmission is gone out, and becomes first pulse in chirped pulse sequence, residue 90% by after vertical reflection in the optics vibration chamber that partially reflecting mirror I 3 and partially reflecting mirror II 4 are formed oscillation transmission; The chamber length in optics vibration chamber is 30 cm, chirped pulse is in oscillation transmission process, each through partially reflecting mirror II 4, just the energy transmission of 10% is had to go out, become the succeeding impulse in pulse train successively, the transmission time difference therefore in chirped pulse sequence between adjacent pulse equals pulse at vibration intracavity round trip time i.e. 2 ns once.Beam splitting chip I 6, plane mirror I 7 form unequal arm Michelson interferometer together with sample 5 surface, and wherein one piece of catoptron of Michelson interferometer is served as on sample 5 surface; In the chirped pulse sequence onwards transmission process that optics vibration chamber exports, unequal arm Michelson interferometer is imported by beam splitting chip I 6, corresponding output differs from 3 ps and two of co-axial propagation pulse trains for having fixed delay time, wherein experience the pulse train on sample 5 surface for detection light, the pulse train of experience plane mirror I 7 is reference light; When sample 5 surface has certain movement velocity, follow according to Doppler's principle, detecting light beam will with movable information.Finally, two chirped pulse sequence transmission enter spectrometer 8, after dispersion, are recorded the frequency spectrum interference striped of generation by streak camera 9; By carrying out spectrum unscrambling to frequency spectrum interference striped, derived sample surface is in the velocity variations history of periodicity time interval (cycle 2 ns, time interval 200 ps) interior high time resolution (~ 2.2 ps).In fact, suitably arrange linear-chirped-pulse pulsewidth, the chamber length in optics vibration chamber and the sampling time of streak camera, these periodic Measuring Time intervals can realize partly overlapping.
Above the optical path arrangement of scanning Frequency Domain Interferometer of the present utility model being described in detail, in order to better understand measuring principle of the present utility model, being described in detail to the specifically process of testing the speed of the utility model scanning Frequency Domain Interferometer below.
Suppose Gaussian incident broad band pulse center wavelength 800 nm, the corresponding Fourier transform extreme pulse widths fs of bandwidth 40 nm(); After being linear-chirped-pulse by pulse stretcher broadening, pulsewidth ps; The chamber length making optics vibration chamber is 30 cm, and behind linear-chirped-pulse input vibration chamber, output is a temporal pulse train, and adjacent pulse is spaced apart 2 ns; Linear-chirped-pulse sequence enters unequal arm Michelson interferometer by beam splitting chip, two bundles are divided into by beam splitting chip, wherein detect light (reflecting part) and impinge perpendicularly on sample surface, if move with certain speed in sample surface, according to Doppler's principle, will be changed by the detection light phase (time not moving in relative sample surface) of its reflection; The reference light that unequal arm Michelson interferometer exports and detection light have certain delay-time difference (supposing 3 ps), when their successively enter spectrometer, between the respective pulses (time on difference 3 ps) in reference light pulse sequence and detecting optical pulses sequence, frequency domain interference will be there is.Because streak camera (having time scan function) is coupling on spectrometer as final recording unit, the data image of record forms by overlapping the frequency spectrum interference striped be parallel to each other more, in detail, frequency spectrum stripe direction is parallel to the spatial axes of streak camera, on the time-axis direction of streak camera, adjacent two cover stripeds are in parastate and interval 2 ns.The static striped of record when not moving relative to sample surfaces, the frequency spectrum interference striped this moment recorded is mobile by existence, detection light phase change corresponding to move of stripe can be obtained by data processing, utilize Doppler phase shift formula can try to achieve sample surfaces speed further.Due to detection only linear-chirped-pulse sequence (pulsewidth 200 ps, adjacent pulse interval 2 ns), periodic time interval is correspond to according to the sample surfaces speed history that single width data image obtains, that namely obtain is sample surfaces speed (cycle 2 ns in periodicity time interval, interval 200 ps) change histories, and the measurement periodically in time interval has the feature of high time resolution (ps).
So far the scanning Frequency Domain Interferometer of this embodiment is completed.
embodiment 2
Wideband pulse in the present embodiment is femto-second laser pulse.When measuring free surfaces of specimen speed when picosecond laser drives shock wave unloading, femto-second laser is used to be advantageously as the wideband pulse light source of scanning Frequency Domain Interferometer.The femto-second laser pulse that femto-second laser 10 exports is divided into two bundles by beam splitting chip 11.Wherein first folded light beam is picopulse by grating stretcher 12 broadening, drives light beam to use as pumping; After the optical delay circuit formed by plane mirror 13, plane mirror 14, plane mirror 15 and plane mirror 16, pump light is reflected by plane mirror 17, and focused on sample 5 front surface by convex lens 18, thus drive shock wave in specimen material; When shock motion unloads to sample rear surface, rear surface setting in motion.Another bundle, through the femto-second laser pulse of beam splitting chip 11, after being reflected by plane mirror 19, is used as the incident broad band pulse of scanning Frequency Domain Interferometer, as shown in Figure 2.
The above is only embodiment of the present utility model, not does any pro forma restriction to the utility model.
Although the utility model discloses as above with embodiment, but and be not used to limit the utility model.Any those of ordinary skill in the art, do not departing under technical solutions of the utility model ambit, the Method and Technology content of above-mentioned announcement all can be utilized to make many possible variations and modification to technical solutions of the utility model, or be revised as the Equivalent embodiments of equivalent variations.Therefore, every content change and modification not departing from technical solutions of the utility model, all still belongs to the scope of technical solutions of the utility model protection.
Claims (4)
1. scan a Frequency Domain Interferometer, it is characterized in that, described interferometer comprises: wideband pulse, pulse stretcher, partially reflecting mirror, beam splitting chip, sample, plane mirror, spectrometer and streak camera, the transmitting procedure of described interferometer beam is, a branch of wideband pulse (1) is first by pulse stretcher (2), then impinge perpendicularly on partially reflecting mirror I (3) and partially reflecting mirror II (4) successively, wherein, the reflected light of partially reflecting mirror I (3) returns along former road, transmitted light then impinges perpendicularly on partially reflecting mirror II (4), reflected light oscillation transmission in the optics vibration chamber that two pieces of partially reflecting mirrors are formed of partially reflecting mirror II (4), transmitted light is then divided into two pulses and transmitted pulse and reflected impulse when propagating through beam splitting chip (6), transmitted pulse and reflected impulse impinge perpendicularly on plane mirror (7) and sample (5) surface respectively, after vertical reflection, two pulses second time is by realizing time beam splitting chip (6) coaxially closing bundle, then spectrometer (8) and streak camera (9) is entered successively.
2. scanning Frequency Domain Interferometer according to claim 1, is characterized in that, described wideband pulse is femto-second laser pulse or super continuous impulse, and pulse bandwidth is greater than 10 nm.
3. scanning Frequency Domain Interferometer according to claim 1, is characterized in that, described pulse stretcher is grating stretcher or dispersive glass.
4. scanning Frequency Domain Interferometer according to claim 1, is characterized in that, described partially reflecting mirror I (3), the reflectivity of partially reflecting mirror II (4) and transmissivity are respectively 90%, 10%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420658724.0U CN204188637U (en) | 2014-11-07 | 2014-11-07 | A kind of scanning Frequency Domain Interferometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420658724.0U CN204188637U (en) | 2014-11-07 | 2014-11-07 | A kind of scanning Frequency Domain Interferometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204188637U true CN204188637U (en) | 2015-03-04 |
Family
ID=52620620
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420658724.0U Active CN204188637U (en) | 2014-11-07 | 2014-11-07 | A kind of scanning Frequency Domain Interferometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204188637U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104345168A (en) * | 2014-11-07 | 2015-02-11 | 中国工程物理研究院激光聚变研究中心 | Scanning frequency domain interferometer |
| CN112147630A (en) * | 2020-09-27 | 2020-12-29 | 中国工程物理研究院激光聚变研究中心 | Imaging Doppler velocimeter |
-
2014
- 2014-11-07 CN CN201420658724.0U patent/CN204188637U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104345168A (en) * | 2014-11-07 | 2015-02-11 | 中国工程物理研究院激光聚变研究中心 | Scanning frequency domain interferometer |
| CN112147630A (en) * | 2020-09-27 | 2020-12-29 | 中国工程物理研究院激光聚变研究中心 | Imaging Doppler velocimeter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102636272B (en) | Femtosecond laser pulse measurement method based on transient grating effect and device | |
| US5585913A (en) | Ultrashort pulsewidth laser ranging system employing a time gate producing an autocorrelation and method therefore | |
| CN104345168A (en) | Scanning frequency domain interferometer | |
| GB2585389A (en) | High-performance distributed fiber sensing system based on EHZ ultrafast pulse scanning | |
| CN104730279B (en) | A kind of chirped pulse velocity interferometer | |
| CN110567595B (en) | Real-time measurement method and system for transient ultrashort pulse time width | |
| CN102998006A (en) | Measuring device for femtosecond laser pulse shapes | |
| CN105223163A (en) | A kind of device based on Gouy phase shift π measurement of converse rotation object fine structure | |
| CN103308903B (en) | A kind of distance accuracy proving installation of range finder using laser and method | |
| CN103364090B (en) | Measure the device and method that ultra-short pulse laser propagates phase velocity in media as well | |
| CN102313605A (en) | Method and device for measuring self-referenced spectral interference femtosecond laser pulse in real time | |
| CN101609001A (en) | Method based on phase object monopulse reflection measurement material nonlinearity | |
| CN201247199Y (en) | Non-linear 4f phase coherent imaging apparatus for measuring optics | |
| CN102980739B (en) | Pulse gas laser intracavity flow field measurement device based on four-quadrant detector | |
| CN102183486A (en) | Gas refractive index measurer and measuring method thereof based on optical frequency comb | |
| CN102621069B (en) | 4f phase imaging method for high sensitively measuring optical nonlinearity of material | |
| CN109060150B (en) | Ultra-short pulse time width measuring device and method based on spectral interference | |
| CN204188637U (en) | A kind of scanning Frequency Domain Interferometer | |
| CN102252828B (en) | Method for monitoring real-time change of reflectivity of high-reflection optical element under laser irradiation | |
| CN102707365A (en) | Positive and negative strip-shaped phase diaphragm, 4f phase-coherent nonlinear imaging system employing same and nonlinear refractivity measurement method | |
| CN104729723A (en) | Measurement method of chirp characteristics of linear chirp pulses | |
| CN102944313A (en) | Multifunctional femtosecond laser pulse measuring device | |
| CN102636337A (en) | Method for measuring optical fiber dispersion | |
| CN104344892B (en) | A kind of full optical fiber Frequency Domain Interferometer | |
| CN208224601U (en) | A kind of high speed optical delay line |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |