Transient absorption and reshaping of ultrafast XUV light by laser-dressed helium

Details Transient absorption and reshaping of ultrafast XUV light by laser-dressed helium Transient absorption and reshaping of ultrafast XUV light by laser-dressed helium

2010-10-21

arxiv.org/abs/1010.4558v2

Phys. Rev. A 83, 013419 (2011) [12 pages]

Physics

Atomic Physics

13 pages, 8 figures, 1 table, RevTeX4, revised

Scientific paper

10.1103/PhysRevA.83.013419

We present a theoretical study of transient absorption and reshaping of extreme ultraviolet (XUV) pulses by helium atoms dressed with a moderately strong infrared (IR) laser field. We formulate the atomic response using both the frequency-dependent absorption cross section and a time-frequency approach based on the time-dependent dipole induced by the light fields. The latter approach can be used in cases when an ultrafast dressing pulse induces transient effects, and/or when the atom exchanges energy with multiple frequency components of the XUV field. We first characterize the dressed atom response by calculating the frequency-dependent absorption cross section for XUV energies between 20 and 24 eV for several dressing wavelengths between 400 and 2000 nm and intensities up to 10^12 W/cm^2. We find that for dressing wavelengths near 1600 nm, there is an Autler-Townes splitting of the 1s ---> 2p transition that can potentially lead to transparency for absorption of XUV light tuned to this transition. We study the effect of this XUV transparency in a macroscopic helium gas by incorporating the time-frequency approach into a solution of the coupled Maxwell-Schr\"odinger equations. We find rich temporal reshaping dynamics when a 61 fs XUV pulse resonant with the 1s ---> 2p transition propagates through a helium gas dressed by an 11 fs, 1600 nm laser pulse.

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