Abstract
The extraction of the spectrum corresponding to a single
extreme-ultraviolet ultrashort pulse embedded in an extended spectrum
may alter the duration of the pulse itself. This is due to the
spectral filtering of optics and the differences in the optical path of
the rays caused by ordinary diffraction when a grating is used. The
basic mechanism that leads to the latter effect is the difference of
one wavelength of the path length of two rays diffracted at the first
order by nearby grating grooves. A study of these effects and some
possible solutions obtained from using a pair of diffraction gratings
is presented. The aim of this study is the selection without
dispersion of one or more high-order laser harmonics produced by a
pulse lasting a few femtoseconds and interacting with a gas
jet.
© 1999 Optical Society of America
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