CN109164585A - A kind of ultrafast imaging device based on the counterfeit hot light dispersion wavelength calibration of femtosecond - Google Patents
A kind of ultrafast imaging device based on the counterfeit hot light dispersion wavelength calibration of femtosecond Download PDFInfo
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- CN109164585A CN109164585A CN201811019769.2A CN201811019769A CN109164585A CN 109164585 A CN109164585 A CN 109164585A CN 201811019769 A CN201811019769 A CN 201811019769A CN 109164585 A CN109164585 A CN 109164585A
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/0944—Diffractive optical elements, e.g. gratings, holograms
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/0977—Reflective elements
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Abstract
A kind of ultrafast imaging device based on the counterfeit hot light dispersion wavelength calibration of femtosecond, composition include: beam-expanding system, the counterfeit hot light generation system of pulse, pulse chirp broadening system, event generating device, scattering medium, imaging len, CCD camera and computer to be measured.The present invention passes through scattering medium hot light wave counterfeit to different wave length in advance and demarcates, then ultrafast process is imaged by chirp counterfeit thermal pulse light source, finally using decoding separation different wave length optical information, the image zooming-out of different moments is come out, to realize the ultrafast imaging of single-shot.The apparatus structure is simple, stablizes, is portable high, it is only necessary to which single image acquisition, image sampling rate is high, has high time and spatial resolution.
Description
Technical field
The present invention relates to the optical imageries of the ultrafast process such as quantum physics, semiconductor material, include the counterfeit hot arteries and veins of Fs chirp
Two parts are imaged in the generation and dispersion wavelength calibration single-shot for washing source off, specifically a kind of based on the counterfeit hot light dispersion wavelength calibration of femtosecond
Ultrafast imaging device.
Background technique
In recent decades, in order to meet the needs of scientific research fields such as physics, chemistry, acoustics, material and industrial application, for
The research of ultrafast imaging technique is developed rapidly.Conventional ultrafast imaging technique according to its mode can be divided into continuous mode and
Two class of pulse mode, the ultrafast imaging technique of continuous mode to great amount of images continuous imaging and can digitize storage, pulse mode
Ultrafast imaging technique is mainly recording impulse image, can be detected to dynamic process, is had compared to continuous mode higher
Frame per second.Widely used at present is to shoot frame period up to the streak camera of 100fs, but its provided image information
It is only one-dimensional.Another very potential technology is the time decomposition imaging technique based on pumping probe, however the technology needs
Repeated trigger carried out to specific physical phenomenon, and control the time delay of probe, it is desirable that the event detected has height can
Repeatability.
The full light image photography of timing be a kind of faster ultrafast imaging technique of single-shot of development so far [referring to document 1:
Nakagawa K,Iwasaki A,Oishi Y,et al.Sequentially timed all-optical mapping
Photography (STAMP) [J] .Nature Photonics, 2014, Vol.8], pass through broadening system (glass bar, prism
Group, optical fiber etc.) incident ultrashort pulse source is broadened, then by orthopedic systems generate pulsewidth is equal, frequency not etc.
Subpulse.Ultrafast phenomena is detected using these subpulses as probe, will include image information using optical diffraction system
The subpulse of different wave length be spatially separating, project at CCD different spatial, ultrafast process moved with this
State imaging.
However, the full light image photography of timing is mainly traded space for time, each image only occupies CCD receptor surface
A part causes the reduction of image sampling rate, thus in actual measurement can be to the spatial resolution for reducing fast imaging, same to opportunity
Tool divided beam system limitation single-shot imaging frame number only has units.
Summary of the invention
In order to overcome the problems, such as that above-mentioned resolution ratio reduces and frame number is imaged in single-shot, the present invention provides a kind of based on the counterfeit heat of femtosecond
Light dispersion wavelength calibration ultrafast imaging device, the device use single-shot impulsive measurement, using random scattering media to pulse into
Traveling wave long codes generate subpulse without orthopedic systems, and without being spatially separating, image sampling rate is high, can get it is higher at
Image space resolution ratio.
Technical solution of the invention is as follows:
A kind of ultrafast imaging device based on the counterfeit hot light dispersion wavelength calibration of femtosecond, it is characterized in that, comprising: along optical path according to
The beam-expanding system of secondary placement, the counterfeit hot light generation system of pulse, pulse chirp broadening system, scattering medium, imaging len and CCD phase
Machine, and the computer being connected with the CCD camera are placed between the pulse chirp broadening system and scattering medium optical path
Event generating device to be measured.
The counterfeit hot light generation system of the pulse is that the strong scattering medium system by partial size at 10-100 μm is put into optical path
In, so that the fs pulsed light by expanding is incident on the system, in the scattering additive process of continuous several times, spatial coherence meets with
To destruction, counterfeit thermal characteristics light required for follow-up calibration system is generated.
The pulse chirp broadening system is put down by diffraction grating, the first plane mirror, second plane mirror, third
Face reflecting mirror and fourth plane reflecting mirror composition, first plane mirror and second plane mirror phase in the horizontal direction
Mutually vertical, the third plane mirror and fourth plane reflecting mirror vertical direction is mutually perpendicular to, through the diffraction grating
Incident counterfeit hot light pulse is diffracted into the first plane mirror, is reflected into and spreads out through the first plane mirror and second plane mirror
Grating is penetrated, then third plane mirror is diffracted by diffraction grating, it is anti-to lift fourth plane through the reflection of third plane mirror
Mirror is penetrated, diffraction grating is again returned to through the reflection of fourth plane reflecting mirror, so that counterfeit thermal pulse light four times are passed through diffraction grating, finally
It misplaces in vertical direction along the direction opposite with incident direction and is emitted the counterfeit hot light pulse of chirp, realize the chirp exhibition of the light source
It is wide.
The scattering medium is the diffusion sheet with strong scattering characteristic of 220-800 sand, be also possible to frosted glass or
The strong scatterers such as ZnO are demarcated with this to be scattered coding to the light of different wave length.
The imaging len and CCD camera is imaged imaging collection is carried out by the image information of scattering medium
Single CCD is only needed, and without being spatially separating on CCD, ensure that high sample rate, higher imaging space point can be obtained
Resolution.
The computer can be read in subsequent ultrafast imaging process automatically for storing calibrating procedure and calibration result
CCD acquired image information, and quick Reduced separating is carried out, the image-forming information of different moments is extracted, it is super to realize
Fast single-shot imaging.
The beam-expanding system is made of at least 10 times of amplification factor of optical beam-expanding device.
The extreme physics that the event generating device to be measured mainly passes through the generations such as laser target shooting, fs pulsed light is existing
As.
The present invention has following distinguishing feature:
1, the present invention uses the counterfeit thermal pulse light source of chirp, and the time behavior of ultrafast event is encoded on wavelength, can
Event effectively to be carried out to the separation of fs magnitude, multi channel imaging is realized, there is high temporal resolution；
2, the present invention encodes different wavelengths of light imaging using scattering medium, carries out sky instead of wavelength being imaged in the past
Between the method that separates, there is high CCD sample rate, further increase spatial resolution；
3, the present invention is without being added laser pulse forming system, it is only necessary to carry out coding calibration to wavelength, a few nm waves may be implemented
Long interval, further increases imaging band, has the characteristics that imaging dynamic range is long, imaging time is with high accuracy.
Detailed description of the invention
Fig. 1 is that the present invention is based on the light path schematic diagrams of the ultrafast imaging device of the counterfeit hot light dispersion wavelength calibration of femtosecond；
Fig. 2 is the light path schematic diagram of pulse chirp broadening system；
Fig. 3 is the pulsed light schematic diagram being incident in device.
Specific embodiment
Below with reference to example and attached drawing, the invention will be further described, but protection model of the invention should not be limited with this
It encloses.
Fig. 1 is constituted the present invention is based on the light path schematic diagram of the ultrafast imaging device of the counterfeit hot light dispersion wavelength calibration of femtosecond
It include: beam-expanding system 1, the counterfeit hot light generation system 2 of pulse, pulse chirp broadening system 3, event generating device 4 to be measured, scattering Jie
Matter 5, imaging len 6, CCD camera 7 and computer 8；The beam-expanding system 1 is by least 10 times of amplification factor of optical beam-expanding
Device composition expands the fs pulse of femto-second laser output, makes itself and the strong scattering in the counterfeit hot light generation system 2 of pulse
Body is come into full contact with, and upsets its spatial coherence on the basis of keeping its temporal coherence, finally generates subsequent imaging institute
The counterfeit thermal light source needed.
Referring to Fig. 2, pulse chirp broadens system 3 by diffraction grating a, the first plane mirror b, second plane mirror
C, third plane mirror d and fourth plane reflecting mirror e composition, the first plane mirror b and second plane mirror c
It is mutually perpendicular in the horizontal direction, the third plane mirror d and fourth plane reflecting mirror e vertical direction are mutually perpendicular to, warp
The counterfeit hot light pulse of the diffraction grating a incidence is diffracted into the first plane mirror b, through the first plane mirror b and second
Plane mirror c is reflected into diffraction grating a, then is diffracted into third plane mirror d by diffraction grating a, through third plane reflection
Fourth plane reflecting mirror e is lifted in mirror d reflection, diffraction grating a is again returned to through fourth plane reflecting mirror e reflection, so that counterfeit heat
Pulsed light four times process diffraction grating a, finally misplacing in vertical direction along the direction opposite with incident direction, it is counterfeit to be emitted chirp
The chirp spread of the light source is realized in hot light pulse.
By the pulse chirp counterfeit hot optical pulse strikes of chirp that generate of broadening system 3 to event generating device 4 to be measured, pulse
Different wave length respective pulses different location, the time that the different location of pulse is incident on ultrafast event point is different, because
And the different moments that corresponding ultrafast event develops, i.e. the different wave length ingredient of pulse carry the different moments that ultrafast event develops
Status information.The above image-forming information be incident on scattering medium 5 occur scattering phenomenon generate speckle, then by imaging len 6 at
As arriving CCD camera 7, resolved by computer 8, which is the spectrum camera system based on ghost imaging.Our meetings in advance
The camera system is demarcated using the light of different wave length, calculates effect caused by light of the scattering medium to different wave length
Matrix can finally separate the different wave length ingredient in wide wavestrip, extract different moments entrained by different wave length
Status information, it is final to realize the ultrafast imaging of single-shot with high spatial resolution, high time resolution.
Referring to Fig. 3, in order to deeper into explanation, the pulse being incident in the device drilling in the apparatus is described below
Change process:
Incident fs pulse carries out at least 10 times by beam-expanding system 1 and expands, and then generates system through the counterfeit hot light of extra pulse
System 2 is expanded due to having carried out at least 10 times before, so that light source comes into full contact with strong scattering medium system therein, generation
Corresponding counterfeit thermal pulse light has space incoherence, and light intensity has corresponding loss, then broadens system by pulse chirp
3, chirp spread is carried out to counterfeit thermal pulse light, bands of a spectrum range increases, and long wavelengthsnIngredient is in pulse front edge, short wavelength λ1At
Divide edge after the pulse, time response and wavelength characteristic correspond, and then pass through event generating device 4 to be measured, pulse is not
It is imaged with different moments state of the part to ultrafast event, thus different wavelengths of light will be with ultrafast event different moments state
Information corresponds, and is then incident on scattering medium 5, since the scattering of hot light counterfeit to different wave length to the scattering medium in advance is made
With corresponding calibration has been carried out, the counterfeit hot light of pulse for carrying ultrafast information now is incident on the scattering medium, different wave length
Also corresponding scattering coding is had, imaging collection is then carried out to it by imaging len 6 and CCD camera 7 again, finally by meter
The wavelength decoding process of calculation machine 8 can extract the image-forming information of different moments, realize ultrafast imaging.
Claims (7)
1. a kind of ultrafast imaging device based on the counterfeit hot light dispersion wavelength calibration of femtosecond characterized by comprising successively along optical path
The beam-expanding system (1) of placement, the counterfeit hot light generation system (2) of pulse, pulse chirp broadening system (3), scattering medium (5), imaging
Lens (6) and CCD camera (7), and the computer (8) being connected with the CCD camera (7) broaden system in the pulse chirp
Event generating device (4) to be measured is placed between system (3) and scattering medium (5) optical path.
2. the ultrafast imaging device according to claim 1 based on the counterfeit hot light dispersion wavelength calibration of femtosecond, which is characterized in that
The counterfeit hot light generation system (2) of the pulse is that the strong scattering medium system by partial size at 10-100 μm is put into optical path, make through
It crosses the fs pulsed light expanded and is incident on the system, in the scattering additive process of continuous several times, spatial coherence is destroyed,
Generate counterfeit thermal characteristics light required for follow-up calibration system.
3. the ultrafast imaging device according to claim 1 based on the counterfeit hot light dispersion wavelength calibration of femtosecond, which is characterized in that
Described pulse chirp broadening system (3) is by diffraction grating (a), the first plane mirror (b), second plane mirror (c), the
Three plane mirrors (d) and fourth plane reflecting mirror (e) form, first plane mirror (b) and the second plane reflection
Mirror (c) is mutually perpendicular in the horizontal direction, the third plane mirror (d) and fourth plane reflecting mirror (e) vertical direction phase
Mutually vertical, the counterfeit hot light pulse through diffraction grating (a) incidence is diffracted into the first plane mirror (b), through the first plane
Reflecting mirror (b) and second plane mirror (c) are reflected into diffraction grating (a), then by diffraction grating (a) to be diffracted into third plane anti-
Mirror (d) is penetrated, lifts fourth plane reflecting mirror (e) through third plane mirror (d) reflection, it is anti-through fourth plane reflecting mirror (e)
It penetrates and again returns to diffraction grating (a), so that counterfeit thermal pulse light four times are passed through diffraction grating (a), it is last along opposite with incident direction
Direction misplace in vertical direction outgoing the counterfeit hot light pulse of chirp, realize the chirp spread of the light source.
4. the ultrafast imaging device according to claim 1 based on the counterfeit hot light dispersion wavelength calibration of femtosecond, which is characterized in that
The scattering medium (5) is the diffusion sheet of 220-800 sand, is demarcated with this to be scattered coding to the light of different wave length.
5. the ultrafast imaging device according to claim 1 based on the counterfeit hot light dispersion wavelength calibration of femtosecond, which is characterized in that
The imaging len (6) and CCD camera (7) is will to carry out imaging collection by the image information of scattering medium, and imaging is only
Single CCD is needed, and without being spatially separating on CCD, ensure that high sample rate, higher imaging space can be obtained and differentiated
Rate.
6. the ultrafast imaging device according to claim 1 based on the counterfeit hot light dispersion wavelength calibration of femtosecond, which is characterized in that
The computer (8) can read automatically CCD in subsequent ultrafast imaging process and adopt for storing calibrating procedure and calibration result
The image information collected, and quick Reduced separating is carried out, the image-forming information of different moments is extracted, to realize ultrafast single-shot
Imaging.
7. the ultrafast imaging device according to claim 1 based on the counterfeit hot light dispersion wavelength calibration of femtosecond, which is characterized in that
The beam-expanding system (1) is made of at least 10 times of amplification factor of optical beam-expanding device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811019769.2A CN109164585A (en) | 2018-09-03 | 2018-09-03 | A kind of ultrafast imaging device based on the counterfeit hot light dispersion wavelength calibration of femtosecond |
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| CN201811019769.2A CN109164585A (en) | 2018-09-03 | 2018-09-03 | A kind of ultrafast imaging device based on the counterfeit hot light dispersion wavelength calibration of femtosecond |
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| WO2015056049A1 (en) * | 2013-10-15 | 2015-04-23 | Uab Mgf Sviesos Konversija | Laser pulse stretcher and compressor |
| CN105974430A (en) * | 2016-05-04 | 2016-09-28 | 西安电子科技大学 | Moving target tracking system and tracking method based on random medium surface diffusion light |
| CN106406019A (en) * | 2016-08-31 | 2017-02-15 | 中国人民解放军国防科学技术大学 | Multi-framing optical imaging device with high temporal-spatial resolution and imaging method |
| CN107085220A (en) * | 2017-06-21 | 2017-08-22 | 中国工程物理研究院流体物理研究所 | A kind of full light framing 3D hologram imaging device of trillion amplitude-frequencies and method |
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2018
- 2018-09-03 CN CN201811019769.2A patent/CN109164585A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101867141A (en) * | 2010-05-27 | 2010-10-20 | 复旦大学 | Device for generating high signal-to-noise ratio pulse based on frequency-doubling type cascading chirped pulse amplification |
| CN102841498A (en) * | 2011-06-24 | 2012-12-26 | 中国科学院物理研究所 | Ultrafast framing imaging device |
| CN103427316A (en) * | 2013-08-22 | 2013-12-04 | 中国科学院上海光学精密机械研究所 | Laser pulse stretching device |
| WO2015056049A1 (en) * | 2013-10-15 | 2015-04-23 | Uab Mgf Sviesos Konversija | Laser pulse stretcher and compressor |
| CN105974430A (en) * | 2016-05-04 | 2016-09-28 | 西安电子科技大学 | Moving target tracking system and tracking method based on random medium surface diffusion light |
| CN106406019A (en) * | 2016-08-31 | 2017-02-15 | 中国人民解放军国防科学技术大学 | Multi-framing optical imaging device with high temporal-spatial resolution and imaging method |
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Application publication date: 20190108 |