
April 25, 2014 11:1 PSP Book - 9in x 6in 06-Rashid-A.-Ganeev-c06
226 Characterization of Plasma Harmonics
nanoparticle formation is the most probable effect during ablation,
because carbon atoms due to their high reactivity tend to form
nanostructures while in plasma phase, and the higher is atom
concentration, the higher is nanoparticle formation rate. On the
contrary, short intense ablation by 8 ps pulses can result in chipping
of very large pieces of graphite, which absorb pump radiation much
more effectively than atoms and small nanoparticles, but only break
to atoms without HHG generation in the process. So, the 10 ns pulses
are preferable not by