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Updated: Apr 14, 2026

Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown
Published on: February 14, 2014
Beyond the single-atom response in absorption line shapes: probing a dense, laser-dressed helium gas with attosecond
Chen-Ting Liao1, Arvinder Sandhu1, Seth Camp2
1College of Optical Sciences and Department of Physics, University of Arizona, Tucson, Arizona 85721, USA.
Abstract:
We investigate the absorption line shapes of laser-dressed atoms beyond the single-atom response, by using extreme ultraviolet (XUV) attosecond pulse trains to probe an optically thick helium target under the influence of a strong infrared (IR) field. We study the interplay between the IR-induced phase shift of the microscopic time-dependent dipole moment and the resonant-propagation-induced reshaping of the macroscopic XUV pulse. Our experimental and theoretical results show that as the optical depth increases, this interplay leads initially to a broadening of the IR-modified line shape, and subsequently, to the appearance of new, narrow features in the absorption line.
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