Enhanced phase-matching for generation of soft X-ray harmonics andattosecond pulses in atomic gases

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DOIResolve DOI: http://doi.org/10.1364/OE.15.015351
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TypeArticle
Journal titleOpt. Express
Optics Express
Volume15
Issue23
Pages1535115364; # of pages: 14
SubjectStrong-field processes; Ultrafast nonlinear optics
AbstractFocus Serial: Frontiers of Nonlinear Optics We theoretically investigate the generation of high harmonics and attosecond pulses by mid-infrared (IR) driving fields. Conditions for coherent build-up of high harmonics are revisited. We show that the coherence length dictated by ionization-induced dephasing does not constitute an ultimate limitation to the coherent growth of soft X-ray (> 100 eV) harmonics driven by few-cycle mid-IR driving pulses: perfect phase-matching, similar to non-adiabatic self-phase- matching, can be achieved even without non-linear deformation of the driving pulse. Our trajectory-based analysis of phase-matching reveals several important advantages of using longer laser wavelengths: conversion efficiency can be improved by orders of magnitude, phase-matched build-up of harmonics can be achieved in a jet with a high gas pressure, and isolated attosecond pulses can be extracted from plateau harmonics. © 2007 Optical Society of America
Publication date
AffiliationNational Research Council Canada; NRC Steacie Institute for Molecular Sciences
Peer reviewedNo
NPARC number12337881
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Record identifier10faa2ef-04f2-4159-82e5-85d67f6e517f
Record created2009-09-10
Record modified2016-05-09
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