Journal
PHYSICAL REVIEW LETTERS
Volume 114, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.114.143002
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Funding
- National Science Foundation (NSF) [PHY-0955274]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-FG02-13ER16403]
- Direct For Mathematical & Physical Scien
- Division Of Physics [0955274] Funding Source: National Science Foundation
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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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