Plasma-induced frequency chirp of intense femtosecond lasers and its role in shaping high-order harmonic spectral lines

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We investigate the self-phase modulation of intense femtosecond laser pulses propagating in an ionizing gas and its effects on collective properties of high-order harmonics generated in the medium. Plasmas produced in the medium are shown to induce a positive frequency chirp on the leading edge of the propagating laser pulse, which subsequently drives high harmonics to become positively chirped. In certain parameter regimes, the plasma-induced positive chirp can help to generate sharply peaked high harmonics, by compensating for the dynamically induced negative chirp that is caused by the steep intensity profile of intense short laser pulses.
Publisher
AMERICAN PHYSICAL SOC
Issue Date
2002-03
Language
English
Article Type
Article
Keywords

QUANTUM-PATH; NONADIABATIC BLUESHIFT; X-RAYS; GENERATION; PULSES; PHASE; GASES; RESOLUTION; RADIATION; FIELD

Citation

PHYSICAL REVIEW A, v.65, no.3

ISSN
1050-2947
URI
http://hdl.handle.net/10203/13372
Appears in Collection
PH-Journal Papers(저널논문)
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