In:
Laser and Particle Beams, Hindawi Limited, Vol. 18, No. 3 ( 2000-07), p. 477-482
Abstract:
We have investigated the effect of free electrons on
the spectral properties of high-order harmonics generated in a neon gas jet by a 30 fs Titanium:Sapphire pumping
laser with intensities in the range 5–10 × 10 14 W/cm 2 . The main feature of our
observations concerns the possibility of continuously tuning the harmonic wavelength in the spectral region 20–7
nm, by taking advantage of the blue shift of harmonic wavelengths induced by the presence of free electrons to cover the
entire spectral region between two consecutive harmonics of the unshifted spectrum. Different amounts of blue shift,
which can be as large as 0.3–0.4 nm, are imparted to the given harmonic by simply changing the gas-jet-laser-beam-waist
relative position. We have also interpreted our experimental results with a simple model for the generation process
based on the “barrier suppression” ionization of an atom exposed to an ultraintense laser field.
Type of Medium:
Online Resource
ISSN:
0263-0346
,
1469-803X
DOI:
10.1017/S026303460018317X
Language:
English
Publisher:
Hindawi Limited
Publication Date:
2000
detail.hit.zdb_id:
2021816-3
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