CN108775966A - A kind of double delay third-order relevant instruments - Google Patents
A kind of double delay third-order relevant instruments Download PDFInfo
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- CN108775966A CN108775966A CN201811030194.4A CN201811030194A CN108775966A CN 108775966 A CN108775966 A CN 108775966A CN 201811030194 A CN201811030194 A CN 201811030194A CN 108775966 A CN108775966 A CN 108775966A
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- 239000013078 crystal Substances 0.000 claims abstract description 90
- 230000010287 polarization Effects 0.000 claims abstract description 11
- 230000001934 delay Effects 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 230000003287 optical effect Effects 0.000 claims description 11
- 230000005540 biological transmission Effects 0.000 claims description 5
- 230000003111 delayed effect Effects 0.000 claims description 2
- 238000011084 recovery Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000001427 coherent effect Effects 0.000 description 2
- 239000002178 crystalline material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005307 time correlation function Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005314 correlation function Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J11/00—Measuring the characteristics of individual optical pulses or of optical pulse trains
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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- Spectroscopy & Molecular Physics (AREA)
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention discloses a kind of double delay third-order relevant instruments.In the device, the rectangular femtosecond basic frequency laser pulse of the space uniform of tested horizontal polarization is divided into transmitted light and reflected light after spectroscope, transmitted light is separated into two beams, it is incident on frequency-doubling crystal simultaneously with horizontal symmetrical angle, generate the single auto-correlation frequency-doubled signal of vertical polarization, the frequency-doubled signal and spectroscopical the reflected beams be incident on simultaneously along vertical plane on frequency crystal, the three rank intensity correlation frequency tripling signals for generating double delays, can restore burst length waveform by simple recursive algorithm.Double delay third-order relevant instruments of the present invention reduce the complexity of pulse-recovery algorithm, improve time accuracy, at low cost, simple in structure, easy to adjust.
Description
Technical field
The invention belongs to ultrafast pulsed laser technical field of measurement and test, and in particular to a kind of double delay third-order relevant instruments.
Background technology
The time waveform of ultrashort pulse can accurately be restored using double delay intensity triple correlation functions, it is entitled
《Laser pulse waveform measuring device based on third-order correlation method》Utility model patent（The patent No.：ZL 2016 2
0734206.1）, it is entitled《A kind of ultrashort laser pulse waveform meter》Utility model patent（The patent No.：ZL 2016
2 0733875.7）With it is entitled《A kind of femto-second laser pulse waveform meter》Utility model patent（The patent No.：ZL
2017 2 1273418.7）It individually discloses and obtains the side of impulse waveform by measuring three rank intensity coherent signals of double delays
Method, but since frequency multiplication light beam transmission range is longer, the space interference effect of frequency multiplication light beam will produce intensity modulated, increase pulse
The complexity of recovery algorithms.
Invention content
In order to overcome existing measuring technique complexity of pulse recovery algorithms in ultrashort pulse waveform measurement
Deficiency, the present invention provide a kind of double delay third-order relevant instruments.
The technical solution adopted by the present invention to solve the technical problems is：
The double delay third-order relevant instruments of one kind of the present invention, its main feature is that, it is equal in the space of horizontal polarization in the measuring device
Spectroscope I is set in even rectangular femto-second laser pulse incident direction；Basic frequency laser pulse by spectroscope I be divided into transmitted light and
Reflected light.Spectroscope II is set on the transmitted light path；The transmitted light of spectroscope I is divided into transmission again through spectroscope II
Light and reflected light.Speculum I, delay modulator I, speculum II, non-thread is disposed on the transmitted light path of spectroscope II
Property crystal assembly, is provided with speculum III on the reflected light path of spectroscope II；The transmitted light of spectroscope II is reflected through speculum I
Speculum II is projected after carrying out optical path delay on to delay modulator I；The light beam reflected from spectroscope II is anti-through speculum III
It penetrates to project simultaneously with the light beam reflected from speculum II afterwards and carries out frequency-doubled conversion in nonlinear crystal component, generate frequency doubled light
Beam.Delay modulator II, guide-lighting microscope group are disposed on the reflected light path of spectroscope I；The light beam that spectroscope I reflects is through prolonging
Slow adjuster II projects guide-lighting microscope group after carrying out optical path delay, and the light beam being emitted from guide-lighting microscope group projects non-linear obliquely
On crystal assembly, frequency tripling conversion is carried out with the frequency multiplication light beam, frequency tripling light beam is exported after nonlinear crystal component.?
Setting lens, filter plate, CCD on the frequency tripling beam direction of nonlinear crystal component output；The nonlinear crystal component
The frequency tripling light beam of rear surface is imaged onto after lens focus, filtered filter out fundamental frequency and frequency multiplication light beam on CCD.CCD is external
Computer, the signal from CCD finally enter computer and carry out data processing.
The nonlinear crystal component is made of two pieces of crystal；Frequency-doubling crystal and frequency crystal are set gradually in order；Times
After the optical axis of frequency crystal is vertically tightly attached to frequency-doubling crystal with frequency crystal in the horizontal direction with the optical axis of frequency crystal；From anti-
The light beam penetrated the light beam of the reflection of mirror II and reflected from speculum III is incident on frequency multiplication with the symmetry angle of non-colinear position along the horizontal plane
On crystal, two light beams intersect at frequency-doubling crystal center, and the overlapping region of two light beams is realized in frequency-doubling crystal
The frequency doubled light of frequency-doubled conversion, generation is exported along with the direction of frequency-doubling crystal perpendicular；The frequency doubled light being emitted from frequency-doubling crystal
With from guide-lighting microscope group come fundamental frequency light along vertical plane with vector non-colinear position angle project simultaneously on frequency crystal II, it is described
Two light beams intersect with II center of frequency crystal, realize frequency tripling conversion in two light beam overlapping regions, generate frequency tripling pair delay three
Rank coherent signal, the third-order correlation signal light edge and the output of II rear surface of frequency crystal.
The guide-lighting microscope group is made of two pieces of orthogonally located up and down guide-lighting mirrors；In basic frequency laser pulse transmission direction
It is disposed with guide-lighting mirror I, guide-lighting mirror II；Guide-lighting mirror I projects incoming Level beam vertically upward, and guide-lighting mirror II will be described
Projecting beam projects obliquely vertically upward；The projecting beam obliquely is vertical with incoming Level beam.
The frequency-doubling crystal I and frequency crystal II uses 90oNon-colinear ooe matchings, according to different laser wavelength of incidence
Select different crystalline materials such as BBO, KDP etc..
The beneficial effects of the invention are as follows：
1. double delay third-order relevant instruments of the present invention are at low cost, simple in structure, easy to adjust, it is close to after frequency-doubling crystal and frequency is brilliant
Body eliminates the space interference effect of frequency multiplication light beam, reduces the complexity of pulse-recovery algorithm.
2. changing the polarization state of light beam in the present invention using two pieces of orthogonal up and down guide-lighting mirrors, three ranks of double delays are improved
The compactedness of correlator.
Description of the drawings
Fig. 1 is a kind of light path schematic diagram of double delay third-order relevant instruments of the present invention；
Fig. 2 is the light path schematic diagram of the nonlinear crystal component in the present invention；
Fig. 3 is the light path schematic diagram of the guide-lighting microscope group in the present invention；
In figure, 1. spectroscope, I 2. spectroscope, II 3. speculum, I 4. delay modulator, I 5. speculums II 6. are non-thread
Property 11. filter plate 12. of the guide-lighting microscope group of 7. speculum of crystal assembly III 8. delay modulator II 9. 10. lens
I 9-2. leaded lights mirror II of CCD 6-1. frequency-doubling crystals 6-2. and frequency crystal 9-1. leaded lights mirror.
Specific implementation mode
Present invention will be further explained below with reference to the attached drawings and examples, but the protection model of the present invention should not be limited with this
It encloses.
Embodiment 1
Fig. 1 is the double delay third-order relevant instrument schematic diagrames of one kind of the present invention；Fig. 2 is the nonlinear crystal component light path in the present invention
Schematic diagram is the A of the nonlinear crystal component in Fig. 1 to side view；Fig. 3 is the guide-lighting microscope group light path schematic diagram in the present invention,
For the guide-lighting microscope group in Fig. 1 B to side view.In Fig. 1 ~ Fig. 3, the double delay third-order relevant instruments of one kind of the invention, in level
Spectroscope I 1 is set in the rectangular femto-second laser pulse incident direction of the space uniform of polarization；Basic frequency laser pulse passes through spectroscope
I 1 are divided into transmitted light and reflected light；Spectroscope II 2 is set on the transmitted light path；The transmitted light of spectroscope I 1 is through spectroscope
II 2 are divided into transmitted light and reflected light again；Speculum I 3 is disposed on the transmitted light path of spectroscope II 2, delay is adjusted
Device I 4, speculum II 5, nonlinear crystal component 6 are saved, speculum III 7 is provided on the reflected light path of spectroscope II 2；Light splitting
The transmitted light of mirror II 2 is reflected on delay modulator I 4 after progress optical path delay through speculum I 3 and projects speculum II 5；From point
The light beam that light microscopic II 2 reflects projects nonlinear crystal simultaneously after the reflection of speculum III 7 with the light beam reflected from speculum II 5
Frequency-doubled conversion is carried out on component 6, generates frequency multiplication light beam；Delay modulator II is disposed on the reflected light path of spectroscope I 1
8, guide-lighting microscope group 9；The delayed adjuster II 8 of light beam that spectroscope I 1 reflects projects guide-lighting microscope group 9 after carrying out optical path delay, from
The light beam that guide-lighting microscope group 9 is emitted is projected obliquely in nonlinear crystal component 6, and carrying out frequency tripling with the frequency multiplication light beam turns
It changes, frequency tripling light beam is exported after nonlinear crystal component 6；On the frequency tripling beam direction that nonlinear crystal component 6 exports
Lens 10, filter plate 11, CCD12 are set；The frequency tripling light beam of 6 rear surface of nonlinear crystal component is poly- through lens 10
It is imaged onto on CCD12 after filtering out fundamental frequency and frequency multiplication light beam for burnt, filtered 11；The external computers of CCD12, the letter from CCD12
It number finally enters computer and carries out data processing.
The nonlinear crystal component 6 is made of two pieces of crystal；Frequency-doubling crystal 6-1 is set gradually in order and frequency is brilliant
Body 6-2；The optical axis of frequency-doubling crystal 6-1 is vertically close to frequency crystal 6-2 with the optical axis of frequency crystal 6-2 in the horizontal direction
After frequency-doubling crystal 6-1；The light beam reflected from speculum II 5 is with the light beam that is reflected from speculum III 7 along the horizontal plane with position phase
The symmetry angle matched is incident on frequency-doubling crystal 6-1, and two light beams intersect at the centers frequency-doubling crystal 6-1, in frequency-doubling crystal
Frequency-doubled conversion, frequency doubled light edge and the frequency-doubling crystal 6-1 perpendiculars of generation are realized in the overlapping region of two light beams in 6-1
Direction output；The frequency doubled light being emitted from frequency-doubling crystal 6-1 is with the fundamental frequency light from guide-lighting microscope group 9 along vertical plane with vector position phase
Matching angle is projected simultaneously on II 6-2 of frequency crystal, and two light beams intersect with II centers 6-2 of frequency crystal, in two light
Frequency tripling conversion is realized in beam overlapping region, generates the double delay third-order correlation signals of frequency tripling, the third-order correlation signal light edge
It is exported with II 6-2 rear surfaces of frequency crystal；As shown in Figure 2.
The guide-lighting microscope group 9 is made of two pieces of orthogonally located up and down guide-lighting mirrors；In basic frequency laser pulse transmission direction
On be disposed with I 9-1 of guide-lighting mirror, guide-lighting II 9-2 of mirror；I 9-1 of guide-lighting mirror projects incoming Level beam vertically upward, guide-lighting
II 9-2 of mirror projects the projecting beam vertically upward obliquely；The projecting beam obliquely and incoming Level beam
Vertically, as shown in Figure 3.
I 6-1 of frequency-doubling crystal and II 6-2 of frequency crystal uses 90oNon-colinear ooe is matched, and is selected in the present embodiment
KDP crystalline materials.
Basic frequency laser pulse is converted to vertical polarization by the guide-lighting microscope group 9 by horizontal polarization.
I 6-1 of frequency-doubling crystal converts horizontal polarization, space uniform basic frequency laser pulse period signal I (t)
For vertical polarization, the frequency-doubled signal G that modulates in the horizontal direction(2)(x1), described and II 6-2 of frequency crystal is by fundamental frequency pulsed light
It is carried out along vertical plane with frequency doubled light and frequently, is converted to double delay third-order correlation signal G(3)(x,y)。
The delay modulator I 4, delay modulator II 8 can not only determine double delay third-order correlation signal G(3)(x,
Y) zero can also extend G(3)The field range of (x, y).
The present invention double delay third-order relevant instruments be used for femto-second laser pulse waveform measurement basic principle be：Prolonged using double
Slow three ranks strength time correlation function G(3)(τ1, τ2) time waveform of pulse can be uniquely determined；And by frequency-doubling crystal and
Being obtained with the non-colinear frequency conversion of frequency crystal can be with three rank space correlation signal G of double delays measured directly(3)(x, y), then lead to
It crosses simple time-space coordinate transform and is converted to three rank strength time correlation function G of double delays(3)(τ1, τ2), then pass through
Simple recursive algorithm restores impulse waveform I (t).
In the present embodiment, incident laser pulse centre wavelength is 800nm, and pulse width is about 0.1ps, and energy is about
10mJ, beam size 1cm, horizontal polarization, frequency-doubling crystal 6-1 with and frequency crystal 6-2 be all made of KDP materials, be all made of non-total
Line ooe non-colinear positions.Two basic frequency beams come from speculum II 5 and the reflection of speculum III 7 are with about 30oAngle in the horizontal direction
It is symmetrically incident on frequency-doubling crystal 6-1, the frequency multiplication light beam of generation is exported along frequency-doubling crystal 6-1 normals to a surface direction, described
Frequency multiplication light beam is with the basic frequency beam from guide-lighting microscope group 9 with about 17oAngle vertically intersect and be incident on and frequency crystal 6-2
On, the incidence angle of basic frequency beam is about 11.80, the incidence angle of frequency doubled light is about 5.80, frequency tripling is generated in light beam overlapping region
Light, the frequency tripling light beam edge of generation and the output of frequency crystal 6-2 normals to a surface direction, the frequency tripling light that at this moment CCD12 is recorded are
For double delay third-order correlation signals；This
In α ≈ 14.73o, β ≈ 11.78o, ε ≈ 5.86o, fundamental frequency, frequency multiplication group velocity u1ν、u2νNumerical value by optics handbook obtain, finally
Data processing is carried out by computer, obtains laser pulse shape distribution I (t).
Claims (4)
1. a kind of double delay third-order relevant instruments, it is characterised in that：In the device, horizontal polarization space uniform it is rectangular
Spectroscope I is set in femto-second laser pulse incident direction（1）；Basic frequency laser pulse passes through spectroscope I（1）It is divided into transmitted light and anti-
Penetrate light；Spectroscope II is set on transmitted light path（2）；Spectroscope I（1）Transmitted light through spectroscope II（2）It is divided into again
Penetrate light and reflected light；In spectroscope II（2）Transmitted light path on be disposed with speculum I（3）, delay modulator I（4）, it is anti-
Penetrate mirror II（5）, nonlinear crystal component（6）, in spectroscope II（2）Reflected light path on be provided with speculum III（7）；Spectroscope
Ⅱ（2）Transmitted light through speculum I（3）It is reflected into delay modulator I（4）Speculum II is projected after upper carry out optical path delay
（5）；From spectroscope II（2）The light beam of reflection is through speculum III（7）After reflection with from speculum II（5）The light beam of reflection is thrown simultaneously
It is mapped to nonlinear crystal component（6）Upper carry out frequency-doubled conversion generates frequency multiplication light beam；In spectroscope I（1）Reflected light path on successively
It is provided with delay modulator II（8）, guide-lighting microscope group（9）；Spectroscope I（1）The delayed adjuster of the light beam of reflection II（8）Carry out light
Cheng Yan, which lags, projects guide-lighting microscope group（9）, from guide-lighting microscope group（9）The light beam of outgoing projects nonlinear crystal component obliquely
（6）On, frequency tripling conversion is carried out with the frequency multiplication light beam, in nonlinear crystal component（6）Frequency tripling light beam is exported afterwards；Non-
Linear crystal component（6）Lens are set on the frequency tripling beam direction of output（10）, filter plate（11）,CCD（12）；Described is non-
Linear crystal component（6）The frequency tripling light beam of rear surface is through lens（10）It focuses, filtered（11）Filter out fundamental frequency and frequency doubled light
CCD is imaged onto after beam（12）On；CCD（12）External computer comes from CCD（12）Signal finally enter computer carry out data
Processing.
2. double delay third-order relevant instruments according to claim 1, it is characterised in that：The nonlinear crystal component（6）
By frequency-doubling crystal（6-1）And frequency crystal（6-2）Two pieces of crystal are constituted；Frequency-doubling crystal is set gradually in order（6-1）And frequency is brilliant
Body（6-2）；Frequency-doubling crystal（6-1）Optical axis vertically with frequency crystal（6-2）Optical axis in the horizontal direction with frequency crystal
（6-2）It is tightly attached to frequency-doubling crystal（6-1）Afterwards；From speculum II（5）The light beam of reflection with from speculum III（7）The light beam edge of reflection
Horizontal plane is incident on frequency-doubling crystal with the symmetry angle of non-colinear position（6-1）On, two light beams are in frequency-doubling crystal (6-1）In
The heart intersects, in frequency-doubling crystal（6-1）Frequency-doubled conversion is realized in the overlapping region of interior two light beams, the frequency doubled light of generation along with again
Frequency crystal（6-1）The direction of perpendicular exports；From frequency-doubling crystal（6-1）The frequency doubled light of outgoing with from guide-lighting microscope group（9）Come
Fundamental frequency light along vertical plane with vector non-colinear position angle simultaneously project and frequency crystal II（6-2）On, two light beams exist
With frequency crystal II（6-2）Center is intersected, and is realized frequency tripling conversion in two light beam overlapping regions, is generated frequency tripling three rank phases of double delays
OFF signal, the third-order correlation signal light edge and frequency crystal II（6-2）Rear surface exports.
3. double delay third-order relevant instruments according to claim 1, it is characterised in that：The guide-lighting microscope group（9）By upper and lower
The guide-lighting mirror of orthogonally located two pieces is constituted；It is disposed with guide-lighting mirror I in basic frequency laser pulse transmission direction（9-1）, it is guide-lighting
Mirror II（9-2）；Guide-lighting mirror I（9-1）Incoming Level beam is projected vertically upward, guide-lighting mirror II（9-2）By it is described it is vertical to
Upper projecting beam projects obliquely；The projecting beam obliquely is vertical with incoming Level beam.
4. double delay third-order relevant instruments according to claim 1, it is characterised in that：The frequency-doubling crystal I（6-1）And
Frequency crystal II（6-2）Using 90oNon-colinear ooe matchings.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109506792A (en) * | 2019-01-16 | 2019-03-22 | 中国工程物理研究院激光聚变研究中心 | A kind of single-shot time autocorrelation function analyzer |
| CN109682484A (en) * | 2019-02-01 | 2019-04-26 | 中国工程物理研究院激光聚变研究中心 | A kind of single-shot time femto-second laser pulse waveform meter |
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