All-optical measurement of high-order fractional molecular echoes by high-order harmonic generation

Wang, Baoning; He, Lixin; He, Yanqing; Zhang, Yinfu; Shao, Renzhi; Lan, Pengfei; Lu, Peixiang

doi:10.1364/oe.27.030172

Cited by 36 publications

(9 citation statements)

References 81 publications

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“…Here we have neglected the effect of the ionization rate. Since the release times of the trajectories 5 and 1 are separated by one optical cycle, cos(∆S 51 ) corresponds to the intercycle interference of the released electron wave packet [33][34][35]. Because the trajectories 3 and 1 are released within the same optical cycle, cos(∆S 31 ) corresponds to the intracycle interference.…”

Section: Resultsmentioning

confidence: 99%

Semiclassical analysis of photoelectron interference in a synthesized two-color laser pulse

Feng

Luo

et al. 2019

Phys. Rev. A

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We measure the photoelectron energy spectra from strong-field ionization of Kr in a two-color laser pulse consisting of a strong 400-nm field and a weak 800-nm field. The intensities of the main above-threshold ionization (ATI) and sideband peaks in the photoelectron energy spectra oscillate roughly oppositely with respect to the relative phase between the two-color components. We study the photoelectron interferometry in strong-field ATI regime from the view of interference of different electron trajectories in order to extend RABBITT type analysis to the strong-field regime. Based on the strong-field approximation model, we obtain analytical expressions for the oscillations of both ATI and sideband peaks with the relative phase. A phase shift of π/4 with respect to the field maximum of the two-color laser pulse is revealed for the interference maximum in the main ATI peak without including the effect of the atomic potential.

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Section: Resultsmentioning

confidence: 99%

Semiclassical analysis of photoelectron interference in a synthesized two-color laser pulse

Feng

Luo

et al. 2019

Phys. Rev. A

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“…[ 25 ] Other applications of rotational echoes can be found, for instance, compensation of the centrifugal distortion of CH 3 I molecule, [ 14 ] calibration of the degree of laser‐induced molecular alignment, [ 26 ] unidirectional rotation of molecular rotors, [ 27 ] and high‐order harmonic generation. [ 28 ]…”

Section: Introductionmentioning

confidence: 99%

Feedback Optimization Strategy for Rotational Alignment Echo Spectroscopy

Bournazel,

Espaignol,

Béjot

et al. 2023

Advanced Photonics Research

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The recent discovery of rotational echoes has contributed to extend the applications of field‐free molecular alignment to short time scales, namely to a temporal region preceding the first alignment revival of the molecule. Most echo measurements require adjusting the position of the echo over time, which in the case of molecular alignment echo unavoidably leads to a change in its amplitude, unless the intensity of the pulse sequence triggering the echo is properly modified. Herein, it is proposed to avoid this drawback by using an optical pulse shaper steered by a learning algorithm. It is demonstrated that a temporal shaping, whose characteristics are optimized to maintain a constant echo amplitude regardless of its creation time, can be generated by controlling the spectral phase and amplitude of the laser pulse which are then used in an open‐loop control system. As a proof of principle, the optimization strategy is applied to the observation of short‐term dissipative dynamics of laser‐aligned molecules exposed to collisions and to the measurement of associated decoherence and population decay time constants.

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“…[ 1 ] During the recombination step, the returning electrons release its accumulated kinetic energy as bright coherent extreme ultraviolet (EUV) and soft X‐Ray radiations with attosecond duration. [ 2–6 ] The generation of attosecond pulses offers the opportunity to probe and control ultrafast electron dynamics inside atoms, [ 7–13 ] molecules, [ 14–18 ] nanostructures, and solids [ 19–26 ] with unprecedented spatial and temporal resolutions, which has been a topic of great interest in attosecond science.…”

Section: Introductionmentioning

confidence: 99%

Generation of Near‐Circularly Polarized Attosecond Pulse with Tunable Helicity by Unidirectionally Rotating Laser Field

Yuan

Njoroge

et al. 2020

Annalen der Physik

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A method to produce circularly polarized attosecond pulses with tunable helicity from CO molecule by using an unidirectionally rotating laser field is proposed. It is found that broadband harmonic supercontinuum with circular polarization can be generated from the oriented CO molecule. This enables the production sub-100 attosecond isolated pulse with the ellipticity as high as 0.9 at the macroscopic level. Moreover, the helicity of the generated high-order harmonics and the attosecond pulse can be tuned by adjusting the orientation of the CO molecule. This method will be beneficial for the studies on chiral-specific dynamics and magnetic circular dichroism on an attosecond time scale.

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All-optical measurement of high-order fractional molecular echoes by high-order harmonic generation

Cited by 36 publications

References 81 publications

Semiclassical analysis of photoelectron interference in a synthesized two-color laser pulse

Semiclassical analysis of photoelectron interference in a synthesized two-color laser pulse

Feedback Optimization Strategy for Rotational Alignment Echo Spectroscopy

Generation of Near‐Circularly Polarized Attosecond Pulse with Tunable Helicity by Unidirectionally Rotating Laser Field

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