
April 24, 2014 17:34 PSP Book - 9in x 6in 04-Rashid-A.-Ganeev-c04
High-Order Harmonic Generation of Picosecond Laser Radiation 125
presence of plasma emission from high-charged particles in the
studied spectral range (50–250 nm), which confirms that these
experiments were carried out at a soft ablation regime of carbon-
containing targets.
The observed difference between the HHG from the plasmas
produced on boron carbide and all other carbon-containing targets
can be attributed to different influence of the neutral and ionic
transitions of B
4
C in the vicinity of 152 nm on the harmonic response
compared with other species. The tuning of the frequencies of ...