CN201935737U - Laser pulse waveform measuring device - Google Patents
Laser pulse waveform measuring device Download PDFInfo
- Publication number
- CN201935737U CN201935737U CN 201020690649 CN201020690649U CN201935737U CN 201935737 U CN201935737 U CN 201935737U CN 201020690649 CN201020690649 CN 201020690649 CN 201020690649 U CN201020690649 U CN 201020690649U CN 201935737 U CN201935737 U CN 201935737U
- Authority
- CN
- China
- Prior art keywords
- lens
- spectroscope
- laser
- transparent medium
- light beam
- 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.)
- Expired - Fee Related
Links
Images
Abstract
The utility model provides a laser pulse waveform measuring device. In the measuring device, parallel light beams to be measured pass through a first spectroscope and are divided into transmitting light and reflecting light by laser; a transmitting light beam sequentially passes through a light beam delay, a first totally-reflecting mirror and a first attenuation sheet and then is incident to a second spectroscope; a reflecting light beam sequentially passes through a second totally-reflecting mirror, a first lens, a transparent medium, a second lens, pores and a second attenuation sheet and is then incident to the second spectroscope; the light beams are focused on the transparent medium through the first lens to generate a plasma for intercepting transmission pulse; and focusing spots on the transparent medium are amplified and imaged on the pores through the second lens. An optical signal which is generated by a plasma and intercepted by pulse and a laser signal delayed for a certain time enter a third attenuation sheet and a phototube through the same path; an electric signal subjected to photoelectric conversion enters a transient digital recorder; and the waveform is spliced and reconfigured according to the positions of pulse intercepted points, thereby acquiring laser pulse contrast information in a high dynamic range.
Description
Technical field
The utility model belongs to the laser parameter field tests, relates generally to a kind of laser pulse shape measurement mechanism.
Background technology
In the process of ultra-intense laser pulse and matter interaction, stronger prepulsing can cause solid target preionization, produce the low-temperature low-density plasma, the time history of prepulsing can have a strong impact on the transmission state of main pulse in material, main pulse and these low-density plasma interactions produce significant impact to the analysis meeting of the processing of experimental result and physical phenomenon, so prepulsing intensity is an important indicator judging the ultra-intense laser system performance with respect to the height of main pulse intensity in the burst length waveform.Laser Measurement burst length waveform adopts method and technology such as high-speed photodetector, streak camera and correlator usually, owing to be subject to the dynamic range of testing apparatus, use separately a certain testing apparatus when measuring the pulse main peak, can not obtain the information of prepulsing, and the main pulse meeting is saturated even damage detecting devices when measuring the prepulsing of high-contrast.Do not see the relevant report of laser pulse shape contrast real-time testing technology at present in the domestic existing patent.
Summary of the invention
In measuring, use laser pulse shape a certain testing apparatus dynamic range little separately in order to overcome prior art, the utility model provides a kind of laser pulse shape measurement mechanism, can produce plasma transmitted pulse is blocked, reach and improve the test of laser pulse shape contrast.
Laser pulse shape measurement mechanism of the present utility model, characteristics are, in the described measurement mechanism, tested collimated laser beam is divided into transmitted light and reflected light with light after through first spectroscope, transmitted light beam is successively through inciding second spectroscope behind light beam delay, first total reflective mirror, first attenuator, folded light beam successively through second total reflective mirror, first lens, transparent medium, second lens, aperture, second attenuator, incide second spectroscope; Folded light beam through second total reflective mirror produces the plasma puncture by first lens focus on transparent medium, transmitted pulse is blocked, on aperture, the light beam in the aperture is entirely from the plasma breakdown area on the transparent medium through the second lens amplification imaging for focal spot on the transparent medium; Arrive second spectroscope through the transmitted light of the first spectroscope beam split gained and reflected light and close bundle, the laser that closes behind the bundle enters into the 3rd attenuator and photoelectric tube successively with same path, and the electric signal that obtains through opto-electronic conversion enters transient digital recorder; Graphic joining reconstruct is carried out in position according to the pulse truncation points, thereby obtains the contrast information of laser pulse shape.
The diameter of described aperture less than the focal beam spot of transparent medium through the diameter of second lens in the aperture position imaging.
When the measured laser pulse is strong, be provided with the vacuum insulation layer around the described transparent medium, prevent air breakdown.
Laser pulse shape measurement mechanism of the present utility model blocks by plasma pulse, measures simultaneously and blocks pulsed optical signals and the laser signal that postpones through certain hour, carries out graphic joining reconstruct, can improve the contrast of laser pulse shape.
Description of drawings
Fig. 1 is a laser pulse shape measurement mechanism structural representation of the present utility model.
Among the figure, 1. first spectroscope, 2. light beams postpone 3. first total reflective mirrors, 4. first attenuators, 5. second total reflective mirrors, 6. first lens, 7. transparent mediums, 8. second lens, 9. apertures, 10. second attenuators, 11. second spectroscopes 12. the 3rd attenuator, 13. photoelectric tubes, 14. transient digital recorders.
Embodiment
Below in conjunction with drawings and Examples the utility model is further specified, but should not limit protection scope of the present invention with this.
Embodiment
Fig. 1 is a laser pulse shape measurement mechanism structural representation of the present utility model, among Fig. 1, the wavelength of tested collimated laser beam is 1064nm, the pulse full width at half maximum is 1ns, energy is ~ 1J, spot diameter is 1cm, through behind first spectroscope 1 light being divided into transmitted light and reflected light, transmitted light beam postpones 2 through light beam successively, first total reflective mirror 3, incide second spectroscope 11 behind first attenuator 4, folded light beam is successively through second total reflective mirror 5, first lens 6, transparent medium 7, second lens 8, aperture 9, second attenuator 10, incide second spectroscope 11, light beam focuses on the transparent medium 7 by first lens 6 and produces plasma transmitted pulse is blocked, at the aperture 9 that is used for confining plasma, the light beam in the aperture 9 is entirely from the plasma breakdown area on the transparent medium through second lens, 8 amplification imagings for focal beam spot.The laser pulse signal that pulse is blocked through plasma generation enters into the 3rd attenuator 12 and photoelectric tube 13 with the laser pulse signal that postpones through certain hour with same path, the electric signal that obtains through opto-electronic conversion enters transient digital recorder 14, graphic joining reconstruct is carried out in position according to the pulse truncation points, thereby obtains laser pulse shape information.
The principle that plasma blocks pulse is: the ultrashort laser high power pulse changes into dense plasma through non-linear process such as multi-photon absorption, avalanche ionizations with initial transparent medium, along with the increase of plasma density, the specific inductive capacity of plasma is corresponding to be reduced; When laser intensity enough high; when the plasma concentration that produces surpasses critical plasma concentration; medium is opaque to laser; incident laser is blocked; the laser energy that sees through significantly reduces, so plasma shutter can have the pulse truncation effect, can effectively pass through by the main pulse peak value during Laser Measurement prepulsing; reach the protection photoelectric detection equipment, improve the purpose that the pulse contrast is measured.
The anti-film of first incidence surface plating increasing of first spectroscope 1, second incidence surface plating anti-reflection film; Second spectroscope, 11 first incidence surfaces plate semi-transparent semi-reflecting film, second surface plating anti-reflection film; First spectroscope 1 and second spectroscope 11 all are 45 in light path
0Place.
The effect of light beam delay 2 is that the laser signal time division multiplex of assurance light signal that pulse is blocked through plasma generation and the delay of process certain hour enters into the 3rd attenuator 12, photoelectric tube 13 and transient digital recorder 14.
Light beam postpones 2 can adopt two plane mirrors of adding between first spectroscope 1 and first total reflective mirror 3, allow light pass through secondary reflection again, make and incide first spectroscope, 1 back transmitted light beam through first spectroscope 1, light beam postpones 2, first total reflective mirror 3, first attenuator 4 and second spectroscope 11 and folded light beam are through second total reflective mirror 5, first lens 6, transparent medium 7, second lens 8, aperture 9, the second attenuators 10, optical path difference is ~ 2 meters between second spectroscope 11, and equivalent time postpones about 6.6ns.
For increasing the laser energy density that produces plasma, first lens 6 adopt short focal length lens, and focal length is 100mm.
The spot size of parallel beam after lens focus is about
, wherein
Be the focal length of first lens 6,
Be laser wavelength of incidence,
Be width of light beam, focal beam spot through amplification imaging on aperture 9, aperture 9 is used for constraint and produces the plasma light beam, the diameter of aperture 9 should be enough little, to guarantee can flow in the aperture all from thin piezoid 7 plasma breakdown areas, promptly only allow the light beam that produces plasma by aperture 9, the size Selection of aperture 9 should be less than focal beam spot through second lens 8 in aperture 9 position imaging diameter, the diameter of aperture 9 is 80 μ m.
In the experiment, at first use the weak laser signal to incide on the proving installation, the light beam that pulse is blocked for plasma generation carries out the peak power coupling with the laser beam that postpones through certain hour, in the light path that produces plasma, add second attenuator 10, guarantee two-way burst length waveform peak approximately equal, be about 500mV, produce plasma and do not produce plasma light path time waveform peak value and be respectively E this moment
P1And E
1Then, incide proving installation, add first attenuator 4 not producing the plasma light path, guarantee two-way burst length waveform peak approximately equal with the laser of certain intensity; Add the 3rd attenuator 12 in common output light path, the burst length waveform peak of guaranteeing to be input to photoelectric tube 13 is about ~ 500mV, and produce plasma and do not produce plasma light path time waveform peak value and be respectively E this moment
P2And E
2If the transmissivity of first attenuator 4 is T, then multiple is blocked in the pulse of plasma shutter effect generation
kFor:
During data processing, with the time waveform number of signals that does not produce plasma that measures on duty with
k,, obtain the laser pulse contrast measurement result of high dynamic range with the pulse waveform signal splicing that produces plasma.
Claims (3)
1. laser pulse shape measurement mechanism, it is characterized in that, tested collimated laser beam is divided into transmitted light and reflected light with laser after through first spectroscope (1) in the described measurement mechanism, transmitted light beam postpones (2) through light beam successively, first total reflective mirror (3), incide second spectroscope (11) behind first attenuator (4), folded light beam is successively through second total reflective mirror (5), first lens (6), transparent medium (7), second lens (8), aperture (9), incide second spectroscope (11) behind second attenuator (10), folded light beam through second total reflective mirror (5) focuses on the transparent medium (7) by first lens (6), the focal beam spot on the transparent medium (7) through second lens (8) amplification imaging on aperture (9); Arrive second spectroscope (11) through the resulting transmitted light of first spectroscope (1) beam split and reflected light and close bundle, the laser that closes behind the bundle enters into the 3rd attenuator (12) and photoelectric tube (13) successively with same path, and the electric signal that obtains through opto-electronic conversion enters transient digital recorder (14).
2. laser pulse shape measurement mechanism according to claim 1 is characterized in that: the diameter of described aperture (9) less than the focal beam spot of transparent medium (7) through the diameter of second lens (8) in aperture (9) position imaging.
3. laser pulse shape measurement mechanism according to claim 1 is characterized in that: described transparent medium (7) is provided with the vacuum insulation layer on every side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020690649 CN201935737U (en) | 2010-12-30 | 2010-12-30 | Laser pulse waveform measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020690649 CN201935737U (en) | 2010-12-30 | 2010-12-30 | Laser pulse waveform measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201935737U true CN201935737U (en) | 2011-08-17 |
Family
ID=44447255
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201020690649 Expired - Fee Related CN201935737U (en) | 2010-12-30 | 2010-12-30 | Laser pulse waveform measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201935737U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103389164A (en) * | 2013-07-19 | 2013-11-13 | 中国科学院西安光学精密机械研究所 | Extreme ultraviolet attosecond pulse width measurement method and device |
| CN103712699A (en) * | 2014-01-08 | 2014-04-09 | 中国工程物理研究院激光聚变研究中心 | Laser pulse contrast ratio measurement device based on optical limiting |
| CN104102064A (en) * | 2014-06-10 | 2014-10-15 | 中国工程物理研究院激光聚变研究中心 | Method for increasing signal-to-noise ratio of high-energy short pulse laser |
| CN104779944A (en) * | 2015-04-27 | 2015-07-15 | 西安交通大学 | Gap switch based on axial and radial laser beam multipoint trigger and method |
| CN104913853A (en) * | 2014-03-12 | 2015-09-16 | 中国科学院光电研究院 | Method and system for measuring ultra-intense ultra-short laser prepulses |
| CN106093013A (en) * | 2016-06-13 | 2016-11-09 | 长春理工大学 | Induced with laser produces the apparatus and method of plasma wall shielding shock motion |
| CN108155541A (en) * | 2017-12-29 | 2018-06-12 | 中国科学院电子学研究所 | Transversely excited CO based on plasma shutter2Laser burst pulse generation device |
-
2010
- 2010-12-30 CN CN 201020690649 patent/CN201935737U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103389164A (en) * | 2013-07-19 | 2013-11-13 | 中国科学院西安光学精密机械研究所 | Extreme ultraviolet attosecond pulse width measurement method and device |
| CN103712699A (en) * | 2014-01-08 | 2014-04-09 | 中国工程物理研究院激光聚变研究中心 | Laser pulse contrast ratio measurement device based on optical limiting |
| CN103712699B (en) * | 2014-01-08 | 2016-05-25 | 中国工程物理研究院激光聚变研究中心 | Laser pulse contrast measurement mechanism based on light amplitude limit |
| CN104913853A (en) * | 2014-03-12 | 2015-09-16 | 中国科学院光电研究院 | Method and system for measuring ultra-intense ultra-short laser prepulses |
| CN104913853B (en) * | 2014-03-12 | 2018-08-14 | 中国科学院光电研究院 | Method and system for measuring ultra-short intense laser prepulsing |
| CN104102064A (en) * | 2014-06-10 | 2014-10-15 | 中国工程物理研究院激光聚变研究中心 | Method for increasing signal-to-noise ratio of high-energy short pulse laser |
| CN104102064B (en) * | 2014-06-10 | 2017-02-01 | 中国工程物理研究院激光聚变研究中心 | Method for increasing signal-to-noise ratio of high-energy short pulse laser |
| CN104779944A (en) * | 2015-04-27 | 2015-07-15 | 西安交通大学 | Gap switch based on axial and radial laser beam multipoint trigger and method |
| CN106093013A (en) * | 2016-06-13 | 2016-11-09 | 长春理工大学 | Induced with laser produces the apparatus and method of plasma wall shielding shock motion |
| CN108155541A (en) * | 2017-12-29 | 2018-06-12 | 中国科学院电子学研究所 | Transversely excited CO based on plasma shutter2Laser burst pulse generation device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201935737U (en) | Laser pulse waveform measuring device | |
| CN103098319B (en) | Laser beam analytical equipment | |
| CN102393383B (en) | ArF laser film element irradiation damage test device with high irradiation density uniformity | |
| CN201724738U (en) | High-power laser near field tester | |
| CN102564611B (en) | High-power laser wave front measuring instrument and wave front measuring method | |
| CN103712688B (en) | High-power ultra-short laser real-time near field intensity distribution measuring device | |
| CN102608613B (en) | Device and method for accurately calibrating point object detectivity of laser radar | |
| CN201225885Y (en) | Integrated test device for high-energy strong laser divergence angle | |
| CN102661917B (en) | Two-tone femtosecond laser collinear pumping detecting thermal reflection system | |
| CN104865576B (en) | A kind of compact ultra-short pulse laser long-distance ranging system and its distance-finding method | |
| CN108469426B (en) | Coaxial included-angle-free pumping detection method and system | |
| CN111504612B (en) | Testing arrangement of many light sources laser damage threshold value | |
| CN101762332A (en) | Single ultrashort laser pulse contrast measuring device | |
| CN208833473U (en) | A kind of multiwavelength laser damage threshold detection device | |
| CN102243106B (en) | Frequency-beating device for laser frequency measurement | |
| CN103134600A (en) | Autocorrelator | |
| CN109406453A (en) | A kind of improved Z scanning survey method | |
| CN102507596A (en) | Optical element surface defect detecting system based on active laser beam scanning | |
| CN104458216A (en) | Device and method for detecting weak absorption of optical element | |
| CN103674488A (en) | Device for measuring divergence angle and light spot pattern of laser device | |
| CN204330141U (en) | A kind of apparatus for measuring high power ultra-short laser pulse contrast | |
| CN108007583B (en) | Nanosecond pulse optical signal to noise ratio measuring device | |
| CN104483105A (en) | Interpixel crosstalk detection system and method | |
| CN102589848B (en) | System for testing optical thin film damage threshold | |
| CN103196570A (en) | Measuring device of ultrafast optical pulse time wave form |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110817 Termination date: 20141230 |
|
| EXPY | Termination of patent right or utility model |