
April 24, 2014 16:39 PSP Book - 9in x 6in 01-Rashid-A.-Ganeev-c01
6 Why Plasma Harmonics?
Figure 1.1 (a) Schematic diagram of the experimental setup. (b) Relative
intensities of harmonics in the rare gases and alkali-metal ions. Reproduced
from Ref. 16 with permission from American Physical Society. Copyright
1992.
the focusing conditions. They assumed that the limited extents of
a plateau may be a consequence of ionization-induced defocusing
of the high-power laser beam, reducing the peak intensity obtained
in the medium. This defocusing is expected to be reduced by using
short-wavelength laser for harmonic generation or by using a laser
in the UV for ...