
April 24, 2014 17:34 PSP Book - 9in x 6in 04-Rashid-A.-Ganeev-c04
Resonance Enhancement of Harmonic Generation of 1064 nm Picosecond Radiation 135
We compared the influence of gases in the harmonic spectra
from the plasma media showing the enhancement of specific orders.
Recently, the studies of the plasma harmonics from graphite ablation
showed a strong seventh harmonic of Nd:YAG laser radiation
(152 nm) compared with the fifth harmonic ([11], also see previous
section). The enhancement of this harmonic was attributed to
the closeness with ionic transition of carbon and improvement
of phase matching conditions for this particular case. Here, in
Fig. 4.15c, ...