
April 24, 2014 16:39 PSP Book - 9in x 6in 01-Rashid-A.-Ganeev-c01
Early Stage of Plasma Harmonic Studies 11
Figure 1.4 High-order harmonic spectra obtained from various laser-
produced plasmas at the early stages of research (1992–1997) [22]. 1-Al,
2-Li, 3-C, 4-C, 5-Na, and 6-LiF.
target turned out to be much less successful. Above-presented data
obtained with the use of highly excited plasmas containing multiply
charged ions revealed several limiting factors, which did not permit
generating harmonics of reasonable efficiency and sufficiently high
orders. Those investigations have stopped at the demonstration