Beyond the single-atom response in absorption line shapes: probing a dense, laser-dressed helium gas with attosecond pulse trains

Chen Ting Liao, Arvinder Singh Sandhu, Seth Camp, Kenneth J. Schafer, Mette B. Gaarde

Research output: Contribution to journalArticle

24 Citations (Scopus)

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.

Original languageEnglish (US)
Pages (from-to)143002
Number of pages1
JournalPhysical Review Letters
Volume114
Issue number14
StatePublished - Apr 10 2015

Fingerprint

Gas Lasers
line shape
Gases
helium
Helium
pulses
gases
optical thickness
lasers
atoms
dipole moments
Lasers
phase shift
propagation
probes

ASJC Scopus subject areas

  • Medicine(all)

Cite this

Beyond the single-atom response in absorption line shapes : probing a dense, laser-dressed helium gas with attosecond pulse trains. / Liao, Chen Ting; Sandhu, Arvinder Singh; Camp, Seth; Schafer, Kenneth J.; Gaarde, Mette B.

In: Physical Review Letters, Vol. 114, No. 14, 10.04.2015, p. 143002.

Research output: Contribution to journalArticle

@article{7737fb997c3b40d7982e3a8a0a9e467a,
title = "Beyond the single-atom response in absorption line shapes: probing a dense, laser-dressed helium gas with attosecond pulse trains",
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.",
author = "Liao, {Chen Ting} and Sandhu, {Arvinder Singh} and Seth Camp and Schafer, {Kenneth J.} and Gaarde, {Mette B.}",
year = "2015",
month = "4",
day = "10",
language = "English (US)",
volume = "114",
pages = "143002",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "14",

}

TY - JOUR

T1 - Beyond the single-atom response in absorption line shapes

T2 - probing a dense, laser-dressed helium gas with attosecond pulse trains

AU - Liao, Chen Ting

AU - Sandhu, Arvinder Singh

AU - Camp, Seth

AU - Schafer, Kenneth J.

AU - Gaarde, Mette B.

PY - 2015/4/10

Y1 - 2015/4/10

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84942155306&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84942155306&partnerID=8YFLogxK

M3 - Article

C2 - 25910116

AN - SCOPUS:84942155306

VL - 114

SP - 143002

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 14

ER -