Quantum path contribution to high-order harmonic spectra

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Ultrashort pulses of uv and soft x-ray radiation with durations ranging from femtoseconds to attoseconds can be produced as high-order harmonics of the fundamental frequency of a laser beam focused into gas. Applications to fields such as spectroscopy and attosecond metrology require the control and characterization of spectral and spatial properties of the emitted radiation. These are determined by both single atom and macroscopic response of the interaction medium to the laser field. Here we present evidence that microscopic effects have a larger influence than previously thought, and can induce a splitting and a frequency shift of the harmonic lines. These results not only offer a direct diagnostic for high-order harmonic generation, but also enable us to better tune the parameters of the produced radiation, while giving a deeper insight into the fundamental physics underlying this nonlinear optical process. © 2008 The American Physical Society
Original languageEnglish
Pages (from-to)023422-1-023422-6
JournalPhysical Review A
Volume77
Issue number2
DOIs
Publication statusPublished - Feb 2008

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harmonics
radiation
metrology
frequency shift
harmonic generations
laser beams
physics
pulses
gases
spectroscopy
lasers
atoms
x rays
interactions

Keywords

  • quantum path contribution
  • high-order harmonic spectra
  • uv and soft x-ray radiation

Cite this

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abstract = "Ultrashort pulses of uv and soft x-ray radiation with durations ranging from femtoseconds to attoseconds can be produced as high-order harmonics of the fundamental frequency of a laser beam focused into gas. Applications to fields such as spectroscopy and attosecond metrology require the control and characterization of spectral and spatial properties of the emitted radiation. These are determined by both single atom and macroscopic response of the interaction medium to the laser field. Here we present evidence that microscopic effects have a larger influence than previously thought, and can induce a splitting and a frequency shift of the harmonic lines. These results not only offer a direct diagnostic for high-order harmonic generation, but also enable us to better tune the parameters of the produced radiation, while giving a deeper insight into the fundamental physics underlying this nonlinear optical process. {\circledC} 2008 The American Physical Society",
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Quantum path contribution to high-order harmonic spectra. / Brunetti, E.; Issac, R.; Jaroszynski, D.A.

In: Physical Review A, Vol. 77, No. 2, 02.2008, p. 023422-1-023422-6.

Research output: Contribution to journalArticle

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