In situ calibration of an extreme ultraviolet spectrometer for attosecond transient absorption experiments

Wang, Xiaowei; Chini, Michael; Yan, Chao; Wu, Yi; Chang, Zenghu

doi:10.1364/ao.52.000323

Cited by 23 publications

(16 citation statements)

References 21 publications

(29 reference statements)

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“…Absorption near the 1s n p excited state energy levels became comparable to the above-threshold absorption with the addition of the laser field. The transmitted spectra were measured using a home-built XUV spectrometer21 based on a flat-field grazing incidence reflection grating (Hitachi 001-0640) as a function of the time delay, with delay steps of 140 as . The spectrometer resolution was approximately 50 meV within the energy range of interest.…”

Section: Methodsmentioning

confidence: 99%

Sub-cycle Oscillations in Virtual States Brought to Light

Chini

Wang

Yan

et al. 2013

Sci Rep

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Understanding and controlling the dynamic evolution of electrons in matter is among the most fundamental goals of attosecond science. While the most exotic behaviors can be found in complex systems, fast electron dynamics can be studied at the fundamental level in atomic systems, using moderately intense (≲103 W/cm2) lasers to control the electronic structure in proof-of-principle experiments. Here, we probe the transient changes in the absorption of an isolated attosecond extreme ultraviolet (XUV) pulse by helium atoms in the presence of a delayed, few-cycle near infrared (NIR) laser pulse, which uncovers absorption structures corresponding to laser-induced “virtual” intermediate states in the two-color two-photon (XUV+NIR) and three-photon (XUV+NIR+NIR) absorption process. These previously unobserved absorption structures are modulated on half-cycle (~1.3 fs) and quarter-cycle (~0.6 fs) timescales, resulting from quantum optical interference in the laser-driven atom.

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Section: Methodsmentioning

confidence: 99%

Sub-cycle Oscillations in Virtual States Brought to Light

Chini

Wang

Yan

et al. 2013

Sci Rep

Self Cite

166

186

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“…A hole-drilled mirror was placed between the toroidal mirror and the second gas cell to combine a time-delayed replica of the driving NIR pulse with the SIAP. After the absorption cell, the transmitted portion of the SIAP was sent to a home-built XUV spectrometer [19], in which the SIAPs were dispersed by a flat-field grating and detected by a microchannel plate (MCP)-phosphor detector which was imaged onto a thermoelectrically cooled CCD. The XUV spectrometer resolution was better than 50 meV in the energy range of interest, as determined by measuring the bound-state absorption lines near the ionization thresholds of neon, argon, and helium.…”

Section: Methodsmentioning

confidence: 99%

Subcycle laser control and quantum interferences in attosecond photoabsorption of neon

et al. 2013

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The dynamics of an atom in a strong infrared laser field (10 13 W/cm 2 ) result in substantial changes to the field-free electronic energy levels, which can be probed on time scales shorter than the laser cycle using isolated attosecond pulses. Here, we measure the transient absorption of an isolated attosecond pulse by laser-dressed bound states of neon near the first ionization threshold. The observed subcycle changes in the absorption spectrum result from both laser-induced ac Stark shifts and from quantum interferences between different multiphoton excitation pathways. We further demonstrate the ability to experimentally turn off the quantum interference mechanism by eliminating one of the interfering pathways.

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“…The delay was scanned using a mirror mounted on a piezoelectric stage and was actively stabilized to an error of ∼25 asec RMS during the experiments. Details of the experimental setup can be found in previous publications [4,29] and references therein.…”

Section: A Experimental Setupmentioning

confidence: 99%

Reconstruction of an excited-state molecular wave packet with attosecond transient absorption spectroscopy

et al. 2016

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Attosecond science promises to allow new forms of quantum control in which a broadband isolated attosecond pulse excites a molecular wave packet consisting of a coherent superposition of multiple excited electronic states. This electronic excitation triggers nuclear motion on the molecular manifold of potential energy surfaces and can result in permanent rearrangement of the constituent atoms. Here, we demonstrate attosecond transient absorption spectroscopy (ATAS) as a viable probe of the electronic and nuclear dynamics initiated in excited states of a neutral molecule by a broadband vacuum ultraviolet pulse. Owing to the high spectral and temporal resolution of ATAS, we are able to reconstruct the time evolution of a vibrational wave packet within the excited B 1 u + electronic state of H 2 via the laser-perturbed transient absorption spectrum.

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In situ calibration of an extreme ultraviolet spectrometer for attosecond transient absorption experiments

Cited by 23 publications

References 21 publications

Sub-cycle Oscillations in Virtual States Brought to Light

Sub-cycle Oscillations in Virtual States Brought to Light

Subcycle laser control and quantum interferences in attosecond photoabsorption of neon

Reconstruction of an excited-state molecular wave packet with attosecond transient absorption spectroscopy

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