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45 results about "Attosecond pulse" patented technology
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Laser wake field accelerator and method for generating high-light attosecond light pulses
InactiveCN103841744AInjection implementationImprove qualityDirect voltage acceleratorsWave fieldOptoelectronics
The invention provides a laser wake field accelerator and a method for generating high-light attosecond light pulses. The laser wake field accelerator comprises a laser source used for generating driving laser and a vacuum chamber with a gas generating device and a focusing system. The gas generating device is provided with a gas target with an uprising density front edge in the driving laser broadcasting direction. The focusing system is used for focusing the driving laser. After being focused by the focusing system, the driving laser generated by the laser source comes into the gas target so as to enable gas molecules in the gas target to be ionized by laser beams, attosecond pulse width electronic sheets are generated, injected and accelerated at the same time, so that the attosecond light pulses are obtained. The laser wake field accelerator and the method can be used for generating the attosecond light pulses with the intensity of the theory of relativity, break through the output radiation capacity based on an existing large traditional accelerator, and provide compact and high-quality attosecond radiation laser sources for wide basic science and industrial application.
Owner:SHANGHAI JIAO TONG UNIV
Extreme ultraviolet attosecond pulse width measurement method and device
The invention relates to an extreme ultraviolet attosecond pulse width measurement method and device. The method comprises the following steps: 1, adjusting double arms of a Mach-Zehnder interferometer so as to realize collinear transmission of superstrong femtosecond pulses locked by extreme ultraviolet attosecond pulses to be detected and carrier envelope phases; 2, focusing two optical fields on the same spacial point of a target; 3, adjusting relative time delay of pumping light and probe light to obtain a two-dimensional photoelectron energy spectra; 4, reestablishing a time-domain outline of the extreme ultraviolet attosecond pulses to be detected by using a frequently-used iteration algorithm in FROG (Frequency-Resolved Optical Gating) to obtain pulse width. The method and device provided by the invention can be used for detecting the attosecond pulses, and also can be used in the application research of the attosecond pulses and the extreme ultraviolet attosecond pulse width.
Owner:XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
Method for measuring attosecond pulse width
The invention relates to a method for measuring the pulse width of attosecond pulse, including the following steps: 1) beam combining light composed of laser and the attosecond pulse is focused on a noble gas, and formed into a photoelectronic signal containing attosecond pulse information by single photon ionization; 2) the photoelectronic signals are collected to obtain a photoelectron spectrum; 3) the photoelectron spectrum is analyzed by utilizing the relational formula of the photoelectron spectrum and the attosecond pulse so as to obtain the pulse width of the attosecond pulse. The method of the invention establishes the direct relation between the photoelectron spectrum and the attosecond pulse, and obtains the pulse width of the attosecond pulse by measuring the photoelectron spectral width; the proposal simplifies the measuring method and avoids massive fitting computation, and the measuring result is precise.
Owner:HUAZHONG UNIV OF SCI & TECH
Method for broadening ultraviolet supercontinuum spectrum by additionally adding TeraHertz wave field
ActiveCN103972769ARegulate the movement pathGuaranteed Linear ChirpSolid masersUltravioletWave field
The invention relates to a method for broadening an ultraviolet supercontinuum spectrum by additionally adding a TeraHertz wave field. A fundamental wave, a bi-color field and a three-color light field serve as an initial driving electric field, one synchronous weak TeraHertz wave electric field is added to the initial driving electric field, a silicon wafer is used for carrying out space beam combining on all light and TeraHertz waves, the beam combined light enters a vacuum cavity, nonlinear action is produced between the beam combined light and the gas medium jetted by a gas target to radiate higher harmonics, a metal filtering film is used for filtering other light out of the higher harmonics, and the needed higher harmonics are obtained. The symmetry of the adjacent half period of an original fundamental wave electric field can be changed more thoroughly through the TeraHertz waves, the motion path and the final recombination of electrons can be adjusted to a greater extent, the ultraviolet supercontinuum is efficiently broadened, the TeraHertz waves are suitable for all femtosecond light sources which can radiate higher harmonics, the linear chirp of an ultraviolet precision light spectrum can be guaranteed, later compression is convenient to carry out to obtain an ultrashort attosecond pulse, and even the zeptosecond time range can be achieved.
Owner:UNIV OF SHANGHAI FOR SCI & TECH +1
Method and device for measuring laser pulse width and relative phase by simultaneous phase-shifting interferometry
The invention discloses a method and a device for measuring a laser pulse width and a relative phase by a simultaneous phase-shifting interferometry, which can measure a femtosecond pulse and an attosecond pulse of which the pulse width is very narrow. In the technology, a component prism is used for splitting light beams, and simultaneously, a plurality of simultaneous phase-shifting interference fringe patterns are obtained once in a spatial domain through a polarization interference method. By computational analysis on interference fields of a plurality of paths, the pulse width and the phase of an ultra-short pulse can be directly measured. The method provided by the invention is simple, clear in principles and excellent in shock resistance of the measuring result, and can implement on-site dynamic measurement and monitoring on the pulse width and the relative phase of the ultra-short pulse in an ultra-fast process. The measuring process is simple and convenient.
Owner:BEIJING UNIV OF TECH
Wide spectral bandwidth ultrashort laser pulse seed source with stable carrier-envelope phase
The invention relates to a wide spectral bandwidth ultrashort laser pulse seed source with a stable carrier-envelope phase (CEP). The seed source comprises a pumping source, a parametric amplification system, a spectrum widening system and a dispersion compensation system. Two difference frequency processes in parametric amplification are utilized to generate light beams with stable CEPs; a dichroic mirror is used to carry out beam combination; the combined light beam is coupled by a lens and then enters a hollow fiber to carry out spectrum widening and pulse compression; and then, a femtosecond ultrashort laser pulse output that has a stable CEP and a continuous super-wide spectral bandwidth is obtained. According to the invention, the seed source is simple and is easy to operate; a gap problem during combination of light beams with different wave bands can be solved; continuous super-wide spectral bandwidths can be obtained; and a femtosecond ultrashort laser pulse output of a monocyclic order or even a sub-cyclic order can be obtained by compression, wherein the output has a stable CEP; therefore, the seed source can be widely applied to many fields like attosecond pulse generation, pumping detection and THz generation and the like.
Owner:SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
Spectrum widening device based on large-mode field anti-resonance hollow-core photonic crystal fiber
ActiveCN106768859ASimple structureFlexible operationTesting fibre optics/optical waveguide devicesBottleVacuum pump
The invention provides a spectrum widening device based on a large-mode field anti-resonance hollow-core photonic crystal fiber. The spectrum widening device comprises a fiber chirped Yb amplifier, a telescope, a plano-convex lens, a first vacuum cavity window sheet, a first vacuum cavity, an anti-resonance hollow-core photonic crystal fiber, a second vacuum cavity, a second vacuum cavity window sheet, a first vacuum barometer, a second vacuum barometer, a first gas path valve, a vacuum pump, a second gas path valve, a third gas path valve, a fourth gas path valve, a vacuum gas tube, a pressure detection valve, a high pressure gas bottle, inert gas and a spectrometer. The invention also provides a use method of the spectrum widening device. The is advantaged by simple structure, flexible operation and highly-efficient transmission, and has a quite wide application prospect in the field of the generation of super continuous spectrums, the pulse shaping technology, the generation of attosecond pulse and the fiber communication.
Owner:INST OF PHYSICS - CHINESE ACAD OF SCI +1
Method for measuring attosecond X-ray pulses and application of method
The invention discloses a method for measuring attosecond X-ray pulses and application of the method. According to the method disclosed by the invention, each measured related phase of a photoelectron is determined by using a parameterized computing formula, and the shape of a pulse and a concrete time structure are rebuilt through one step by using an analytical photoelectron spectrum unscrambling technology; and the time domain characteristics of the attosecond X-ray pulses can be rebuilt from each measured photoelectron spectrum without a large amount of time resolution measurements of a photoelectron spectrum and without a redundant iterative computation and an experimental data fitting process. The time uncertainty of a pulse measurement result is computed from energy bandwidth values of the pulses by using the parameterized formula. Because a direct relation among attosecond pulse time characteristics, important laser parameters (such as peak strength, electric field envelope shape, phase, carrier-envelope phase and the like), atomic or molecular ionization power and the photoelectron spectrum is established by a transformation equation, the method can be used for computing unknown parameters from each known parameter value.
Owner:PEKING UNIV
High-repetition-frequency attosecond pulse photoelectron and ion energy spectrum measuring system and method thereof
The invention relates to a high-repetition-frequency attosecond pulse photoelectron and ion energy spectrum measuring system and a method thereof. The working principle is characterized in that aftera photoelectron or an ion pulse enters a time flight tube and before overlapping of time and space broadening of the photoelectron or ion pulse, a photoelectron or ion pulse strobing gate which is triggered and controlled by a photon or ion pulse synchronizing signal is placed; the strobing gate only selects certain frequency-divided pulse of the repetition frequency of the original photoelectronor ion pulse for passing, and finally photoelectron or ion energy spectrum measurement is performed through the time flight tube. According to the method of the invention, the method of reducing the repetition frequency of the photoelectron or the ion pulse is utilized so that the time interval between adjacent photoelectrons or ion pulses is increased, and overlapping of two adjacent pulses at atime flight spectrum instruction detector is prevented.
Owner:XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
Method for generating higher harmonic wave in cavity
The invention relates to the direction of ultrafast laser technique, concretely relating to an intracavity higher harmonics generating method, directly placing nonlinear medium in a laser oscillator to obtain higher harmonics, and able to obtain few-cycle laser pulses because in the laser oscillator, the dispersion caused by cavity mirror and medium can be perfectly compensated, thus more beneficial to generation of higher harmonics, where the few-cycle laser pulses can obtain UV comb on the condition of locking carrier wave phase and can obtain single attosecond pulses.
Owner:EAST CHINA NORMAL UNIV
Carrier envelope stable phase dual wavelength output optical parameter amplifying laser system
InactiveCN101320191ALimit choiceEasy to operateNon-linear opticsOptical elementsCarrier signalLength wave
The present invention relates to a double wavelength output optical parameter magnifying laser system with a stable carrier wave envelope phase, which has the characteristics that double wavelength with magnified parameters is used for producing and magnifying energy furthermore; therefore, double-wavelength ultrashort infrared pulses are output; the inherent CEP stable quality of idle light is used for obtaining the output of the CEP stable double-wavelength ultra-short infrared pulses. The double wavelength output optical parameter magnifying laser system with a stable carrier wave envelope phase has the advantages of simple operation, easy regulation, stable CEP, wide tune range and double-wavelength output. The double wavelength output optical parameter magnifying laser system with a stable carrier wave envelope phase provides wide light sources for the physics experiments such as the attosecond pulse production, etc.
Owner:SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
Measuring method for ellipsometry of attosecond pulse
InactiveCN109186769AEasy to measureLight polarisation measurementNear infrared laserAttosecond pulse
The invention discloses a measuring method for ellipsometry of an attosecond pulse using a photoelectron spectrum. The method comprises the steps of: first, focusing a combined beam of a near-infraredlaser pulse and an attosecond pulse on a gaseous medium, forming a photoelectron signal containing attosecond pulse information by ionization, and collecting the photoelectron signal to obtain a photoelectron spectrum; then, calculating the relationship between the photoelectron spectrum and the attosecond pulse using the time-dependent Schr dinger equation, and obtaining the ellipsometry of theattosecond pulse by analyzing the photoelectron spectrum. The invention provides a method for obtaining the ellipsometry of the attosecond pulse by detecting the photoelectron spectrum, which is a simple and effective method with a wide range of applicability.
Owner:HUAZHONG UNIV OF SCI & TECH
Method of pulse compression for cascaded optical parametric amplification system
InactiveCN101752782AHigh beam qualityAdd nonlinearityLaser arrangementsFiberOptical parametric amplifier
The invention discloses a method of pulse compression for a cascaded optical parametric amplification system, which is characterized in that: a hollow-fiber compression device is added to the light path of first-class pump light, and the pulse width of the first-class pump light output by the hollow-fiber compression device is compressed to a cycle magnitude, first-class pump light and signal light of the cycle magnitude pass through a first-class optical parametric amplifier, and generates the first-class signal light and first-class idling light, meanwhile, the first-class signal light or the first-class idling light are selected as the signal light of a second-class optical parametric amplifier. The invention avoids the immature infrared compression technology and utilizes the mature compression technology near 800 nm to reach the same expected effect, and the energy loss is greatly reduced, meanwhile, the light-source output performance of OPA system is better, and the invention is beneficial for generating higher harmonic wave, even is beneficial for the application of the single attosecond pulse experiment.
Owner:SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
High subharmonic generation method of non-collineation
InactiveCN1913260AHigh laser peak powerAchieve higher harmonic acquisitionLaser detailsNon-linear opticsHigher order harmonicsAttosecond pulse
This invention relates to a method for generating high-order harmonic waves utilizing the non-collinear non-linear conversion property of medium, which utilizes the mixing property of non-linear beams to lead out high order harmonic waves from the cavity without additional operations in the emitted non-linear medium. The advantage is that it is easier to pick up pure high-order harmonic wave composition to obtain the harmonic waves under the multi-color action and provide even higher laser peak power.
Owner:EAST CHINA NORMAL UNIV
Multidimensional nanotomography with high harmonics and attosecond pulses
ActiveUS20190242819A1High resolutionPromote reconstructionScattering properties measurementsAnalysis by material excitationRefractive indexTomography
Owner:B G NEGEV TECH & APPL LTD
Method for generating extreme ultraviolet coherent light source with approximate circular deflection
InactiveCN104701730AImprove response efficiencyShort pulse widthWave amplification devicesHarmonic spectrumHarmonic
Owner:HUAZHONG UNIV OF SCI & TECH
Attosecond pulse measuring method and device thereof
The invention discloses an attosecond pulse measuring method and a device thereof. The method comprises the following steps: enabling a beam of weak femtosecond pulse to act on the generation processof attosecond pulse to be measured, so as to change the accumulated phase of ionized free electrons in a free state in the generation process of the attosecond pulse to be measured and to carry out the perturbation of the attosecond pulse frequency spectrum to be measured, wherein the weak femtosecond pulse is a femtosecond pulse with the intensity being within a preset intensity range; adjustingthe relative time delay between the weak femtosecond pulse and a driving field used for generating the attosecond pulse to be measured to obtain a two-dimensional trace graph of the attosecond pulse frequency spectrum to be measured changing along with the relative time delay; and extracting complete time domain structure information of the attosecond pulse to be measured from the two-dimensionaltrace graph through a reconstruction algorithm. According to the method, a beam of extra weak femtosecond pulse is introduced to carry out perturbation on the generation process of a single attosecondpulse, a two-dimensional diagram of single attosecond frequency spectrum changing along with time delay is obtained by changing relative time delay between the two beams of pulse, and finally the time structure information of the single attosecond pulse is extracted from the two-dimensional diagram through a PCGPA algorithm.
Owner:HUAZHONG UNIV OF SCI & TECH
Device and method for generating attosecond pulse by using multi-color field and nano-tip action
InactiveCN109521623AShort pulse widthIncreased pulse strengthNon-linear opticsOptoelectronicsOptical polarization
The invention discloses a device and method for generating an attosecond pulse by using a multi-color field and a nano-tip action. Laser devices, a reflector, a buncher, an electrostatic generation field, a nano tip and an aluminum foil are arranged. The light paths of polarized laser generated by the laser devices are adjusted by a reflector; the buncher adjusts the two beams of linear polarizedlight to be in a same propagation direction and polarization direction. The nano tip is arranged under two strong short laser pulses and an electrostatic field. Strong linearly polarized light generated by the laser devices acts with the metal nano tip to generate higher harmonics; and then the aluminum foil is used for screening effective frequency components to form a single attosecond pulse. According to the invention, two linearly polarized electrical fields with the parallel polarization directions in a parallel two-color state and one electrostatic field with the proper intensity are employed; and the nano tip is arranged in the fields to obtain higher harmonics including one super-continuous spectrum, so that a pure isolated attosecond pulse is obtained with the pulse width of 120 attoseconds.
Owner:SHANTOU UNIV
Device for generating arbitrary frequency multiplication signals of optical frequency combs on basis of coupled type optoelectronic oscillator
ActiveCN109932851AStable outputReduce phase noiseCoupling light guidesLight demodulationPhase noiseTime delays
The invention discloses a device for generating arbitrary frequency multiplication signals of optical frequency combs on basis of a coupled type optoelectronic oscillator. According to the device, a phase locked loop is utilized to lock the phase of the oscillation signals of the coupled optoelectronic oscillator to a highly-stable reference source, so that low-phase-noise and high-stability radiofrequency signals can be generated; the synchronous matching of lock frequencies and optical fiber laser modes is realized, and therefore, stable optical frequency comb output is realized; and sincethe optical frequency combs undergo the loops of optical fiber delay lines of different lengths, an optical coupler couples the optical frequency combs undergoing different time delay, and then optical frequency combs of any multiplied frequencies can be generated. The device of the present invention can be suitable for providing stable optical signal sources for systems such as planetary detection, fiber optic communication, and attosecond pulse systems.
Owner:ZHEJIANG UNIV
X-ray coherent measuring device and measuring method
ActiveCN108663702AImprove reflection efficiencyImprove transmission efficiencyX/gamma/cosmic radiation measurmentHard X-raysMeasurement device
The invention provides an X-ray coherent measuring device which comprises an x-ray beam splitting unit; an x-ray beam combining unit and an x-ray time-delay scanning unit which is arranged between thex-ray beam splitting unit and the x-ray beam combining unit and comprises a first pair of transmission reflecting mirrors and a second pair of transmission reflecting mirrors, wherein the first pairof transmission reflecting mirrors are symmetrically arranged relative to the central axis, the second pair of transmission reflecting mirrors are symmetrically arranged relative to the central axis;and the first pair of transmission reflecting mirrors are respectively fixed on the two sliding rails. The sliding rail directions of the two sliding rails are approximately perpendicular to the central axis. The second pair of transmission reflecting reflectors are fixed on a one-dimensional translation table together; and the translation direction of the one-dimensional translation table is parallel to the central axis. The invention further provides two measuring methods of the X-ray coherent measuring device. The X-ray coherent measuring device is applicable to an extreme ultraviolet XUV,a soft X-ray and a hard X-ray, and the time coherence length of attosecond pulses induced by soft X-ray free electron laser hard X-ray free electron laser and high-field laser can be directly measuredin a time domain.
Owner:SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
A method and device for generating ellipsometric attosecond pulses
InactiveCN110994347BRealize ellipticity controlLaser detailsLaser output parameters controlRelative phaseHarmonic
The invention discloses a method and a device for generating elliptically polarized attosecond pulses. A double-color laser field obtained by superposing the linearly polarized laser and the circularly polarized laser interacts with polar gas molecules, and an electric field parameter of the double-color laser field is calculated and adjusted by utilizing a three-dimensional time-containing schrodinger equation, so that the interaction generates higher harmonics; by adjusting the intensity ratio of the double-color laser field, the generated higher harmonics have the ellipsometry rate larger than the preset ellipsometry rate value in the cut-off region; and the higher harmonics with the ellipsometry rate larger than the preset ellipsometry rate value are synthesized into the attosecond pulse, and the ellipsometry rate of the attosecond pulse is regulated and controlled by adjusting the relative phase of the double-color laser field. According to the invention, high enough harmonic efficiency is ensured, and then elliptically polarized harmonic waves in a cut-off region are synthesized into high-efficiency elliptically polarized isolated attosecond pulses. Besides, the method can realize regulation and control of the rotatability and ellipsometry rate of the isolated attosecond pulse by adjusting the relative phase of the double-color field, and is a practical method for generating and adjusting the ellipsometry isolated attosecond pulse.
Owner:HUAZHONG UNIV OF SCI & TECH
High subharmonic generation method of non-collineation
InactiveCN100399653CHigh laser peak powerAchieve higher harmonic acquisitionLaser detailsNon-linear opticsHigher order harmonicsAttosecond pulse
This invention relates to a method for generating high-order harmonic waves utilizing the non-collinear non-linear conversion property of medium, which utilizes the mixing property of non-linear beams to lead out high order harmonic waves from the cavity without additional operations in the emitted non-linear medium. The advantage is that it is easier to pick up pure high-order harmonic wave composition to obtain the harmonic waves under the multi-color action and provide even higher laser peak power.
Owner:EAST CHINA NORMAL UNIV
Method and device for generating elliptically polarized attosecond pulses
InactiveCN110994347ARealize ellipticity controlLaser detailsLaser output parameters controlRelative phaseHarmonic
The invention discloses a method and a device for generating elliptically polarized attosecond pulses. A double-color laser field obtained by superposing the linearly polarized laser and the circularly polarized laser interacts with polar gas molecules, and an electric field parameter of the double-color laser field is calculated and adjusted by utilizing a three-dimensional time-containing schrodinger equation, so that the interaction generates higher harmonics; by adjusting the intensity ratio of the double-color laser field, the generated higher harmonics have the ellipsometry rate larger than the preset ellipsometry rate value in the cut-off region; and the higher harmonics with the ellipsometry rate larger than the preset ellipsometry rate value are synthesized into the attosecond pulse, and the ellipsometry rate of the attosecond pulse is regulated and controlled by adjusting the relative phase of the double-color laser field. According to the invention, high enough harmonic efficiency is ensured, and then elliptically polarized harmonic waves in a cut-off region are synthesized into high-efficiency elliptically polarized isolated attosecond pulses. Besides, the method can realize regulation and control of the rotatability and ellipsometry rate of the isolated attosecond pulse by adjusting the relative phase of the double-color field, and is a practical method for generating and adjusting the ellipsometry isolated attosecond pulse.
Owner:HUAZHONG UNIV OF SCI & TECH
Ultra-short femtosecond pulse in-situ measurement method based on interference fringes
PendingCN114199389APrevent dispersionImprove data collection efficiencyOptical measurementsReconstruction algorithmAttosecond pulse
The invention belongs to the field of ultrafast laser, and particularly relates to an ultrashort femtosecond pulse in-situ measurement method based on interference fringes, which comprises the following steps: dividing an original ultrashort femtosecond pulse into two beams, one beam is used as a pulse to be measured, and the other beam is used for generating higher harmonics to obtain an extreme ultraviolet attosecond pulse or a pulse string thereof; controlling relative time delay between the extreme ultraviolet attosecond pulses or pulse strings thereof and the to-be-detected pulses, and then combining and focusing on the rare gas to interact with the rare gas; optical interference between attosecond extreme ultraviolet pulses and photons radiated by rare gas atoms in a virtual state results in interference fringes above a single ionization threshold of the rare gas atoms in a transmission spectrum. The perturbation theory shows that the fringes record the self-convolution of the ultra-short femtosecond pulse in the frequency domain, and can be used for directly representing the ultra-short femtosecond pulse without a reconstruction algorithm. The all-optical in-situ measurement method is simple and convenient and is used for directly measuring femtosecond pulses, and any few-period laser pulses can be measured.
Owner:HUAZHONG UNIV OF SCI & TECH
Method for measuring attosecond X-ray pulses and application of method
The invention discloses a method for measuring attosecond X-ray pulses and application of the method. According to the method disclosed by the invention, each measured related phase of a photoelectron is determined by using a parameterized computing formula, and the shape of a pulse and a concrete time structure are rebuilt through one step by using an analytical photoelectron spectrum unscrambling technology; and the time domain characteristics of the attosecond X-ray pulses can be rebuilt from each measured photoelectron spectrum without a large amount of time resolution measurements of a photoelectron spectrum and without a redundant iterative computation and an experimental data fitting process. The time uncertainty of a pulse measurement result is computed from energy bandwidth values of the pulses by using the parameterized formula. Because a direct relation among attosecond pulse time characteristics, important laser parameters (such as peak strength, electric field envelope shape, phase, carrier-envelope phase and the like), atomic or molecular ionization power and the photoelectron spectrum is established by a transformation equation, the method can be used for computing unknown parameters from each known parameter value.
Owner:PEKING UNIV
Method and device for dynamic compensation and pulse compression of higher harmonics intrinsic chirp
InactiveCN101615754BAchieve compensationImprove production efficiencyLaser detailsNon-linear opticsHarmonicIntrinsics
A method and a device for dynamic compensation and pulse compression of higher harmonics intrinsic chirp are disclosed; in the method, the reshaping function of two colour laser fields on an electric field is used, when a weak frequency multiplication filed is overlapped on fundamental frequency light, the frequency multiplication filed introduces an additional phase item of a sin function form in the generating process of harmonic wave, the additional phase item can change from negative periodicity to positive periodicity along with the relatively delayed alteration between two colour fields, thus causing the chirp compensation of attosecond pulse to continuously change from negative to positive and obtaining the attosecond pulse of change limit. The invention not only can realize the compensation on attosecond pulse chirp but also can improve the generation efficiency of harmonics, and the invention is also suitable for single attosecond pulse below hundred attosecond.
Owner:SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
Carrier envelope stable phase dual wavelength output optical parameter amplifying laser system
InactiveCN100570464CLimit choiceEasy to operateNon-linear opticsOptical elementsCarrier signalLength wave
The present invention relates to a double wavelength output optical parameter magnifying laser system with a stable carrier wave envelope phase, which has the characteristics that double wavelength with magnified parameters is used for producing and magnifying energy furthermore; therefore, double-wavelength ultrashort infrared pulses are output; the inherent CEP stable quality of idle light is used for obtaining the output of the CEP stable double-wavelength ultra-short infrared pulses. The double wavelength output optical parameter magnifying laser system with a stable carrier wave envelope phase has the advantages of simple operation, easy regulation, stable CEP, wide tune range and double-wavelength output. The double wavelength output optical parameter magnifying laser system with a stable carrier wave envelope phase provides wide light sources for the physics experiments such as the attosecond pulse production, etc.
Owner:SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
A Method for Reconstructing the Electric Field Envelope Using the Single Photon Single Ionization Mechanism
The invention discloses a method for reconstructing an electric field envelope by using a single photon single ionization mechanism. The method comprises the following steps: S1, a measured single attosecond pulse interacts with a working gas to obtain an electron momentum spectrum, and the electric field envelope distribution Eatto of the attosecond pulse is reconstructed by the least squares method for the electron momentum spectrum; S2, the intensity ratio of the sideband signal and the single photon ionization signal generated different attosecond-infrared electric fields under relative time delay; and S3, according to the attosecond pulse electric field envelope distribution Eatto obtained by the step S1 and the intensity ratio of the sideband signal and the single photon ionization signal obtained in the step S2, the envelope EL0 of the infrared electric field is established by the least squares method. The invention can not only reflect the kinetics process of electrons in the attosecond pump detection experiment, but also reconstruct the envelope distribution of the attosecond pulse electric field and the envelope of the infrared electric field, and does not depend on the carrier-envelop phase with the attosecond pulse and the infrared electric field.
Owner:WUHAN INSTITUTE OF TECHNOLOGY
Method, system and medium for measuring electron orbital radius based on attosecond fringe spectroscopy
ActiveCN110095805BSimple theorySimple calculationRadiation particle trackingElectron orbitalSpectroscopy
The invention relates to a method, a system and a medium for measuring electron orbit radius based on attosecond fringe spectrum. The method includes acquiring the attosecond fringe spectrum generated by a plurality of infrared electric fields and a single attosecond pulse laser acting on a working gas respectively, and obtaining Under multiple electron initial positions, multiple classical fringe trajectories are generated by multiple infrared electric fields and a single attosecond pulsed laser acting on the working gas respectively; the photoionization time delay of the working gas is obtained according to the attosecond streak spectrum, and according to the multiple The multiple classical photoionization time delays corresponding to the working gas are obtained from each classical fringe trajectory; the electron orbital radii corresponding to the working gas are obtained according to the photoionization time delay and the multiple classical photoionization time delays. Based on the attosecond fringe spectrum, the invention can realize the direct measurement of the electron orbital radius. The method is simple in theory, low in calculation difficulty, small in calculation amount and high in precision.
Owner:WUHAN INSTITUTE OF TECHNOLOGY
Multidimensional nanotomography with high harmonics and attosecond pulses
ActiveUS10724952B2High resolutionPromote reconstructionSpectrum investigationScattering properties measurementsRefractive indexTomography
A system and method for performing four dimensional multicolor nanotomography with high harmonics and attosecond pulses to attain spectrally resolved absorption data about the three-dimensional volumetric structure of a sample are disclosed. Also disclosed are embodiments of the system and method that have been adapted to perform four dimensional multicolor nanotomography absorption and index of refraction data about the three-dimensional volumetric structure of a sample, to perform five dimensional multicolor nanotomography with high harmonics and attosecond pulses to obtain spectrally resolved absorption data about the three-dimensional volumetric structure and temporal dynamics of the sample, to perform five dimensional multicolor nanotomography to obtain spectrally resolved absorption and index of refraction data about the three-dimensional volumetric structure and temporal dynamics of the sample, and to perform Fourier-domain Optical Coherence Tomography.
Owner:B G NEGEV TECH & APPL LTD
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