Nonadiabatic blueshift of high-order harmonics from Ar and Ne atoms in an intense femtosecond laser field

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A strong blueshift of high-order harmonics was observed when intense femtosecond Ti:sapphire laser pulses were applied to Ar and Ne. The blueshift was systematically investigated for various experimental parameters, such as laser intensity, laser-pulse duration, and gas density. We observed the harmonic blueshifts of two times the laser frequency in the 39th harmonic from Ar and four times the laser frequency in the 85th harmonic from Ne. A semiclassical calculation predicted the inverse proportionality of the blueshift to the laser-pulse duration, which was confirmed in the experiment done with 30 fs and YB fs pulses. The density dependence of blueshift showed that the self-phase modulation in an ionizing medium was not a major factor of the observed blueshift. The experimental results along with theoretical calculations confirmed that the observed blueshift resulted mainly from the nonadiabatic effect due to the rapid increase in the femtosecond laser electric field.
Publisher
AMERICAN PHYSICAL SOC
Issue Date
2001-05
Language
English
Article Type
Article
Keywords

TI-SAPPHIRE LASER; RARE-GASES; GENERATION; EMISSION; PULSES; PHASE

Citation

PHYSICAL REVIEW A, v.63, no.5, pp.053407 - 053407

ISSN
1050-2947
URI
http://hdl.handle.net/10203/13374
Appears in Collection
PH-Journal Papers(저널논문)
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