Abstract
Recently, much attention has been focused on the generation of high-order harmonics using high-power laser pulses. Optical harmonics of extremely high orders were detected in experiments using high-power ultrashort laser pulses focused into rare-gas jets [1 - 4]. For the most part, experiments on harmonic generation both in rare gases [1 - 4] and in a laser-produced plasma [5 - 12] use pulsed high-power systems. First experiments on third-harmonic generation at a high repetition rate, which used 1-kHz laser pulses with a duration of 200 fs, demonstrated that the efficiency of third-harmonic generation (THG) in a plasma of self-induced optical breakdown can be as high as 7*10-4 [13].
© 1996 Optical Society of America
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