Abstract
By studying the detailed dynamics of ultrashort pulses at semiconductor–vacuum interfaces, we have shown that the interaction of these pulses with nonstationary semiconductor plasmas can, under appropriate conditions, lead to a variety of interesting phenomena: controlled upshifting of the laser frequency, possible cascading of upshifting, a trapped pulse bouncing back and forth in the sample, and a so-called machine gun of increasingly blueshifted pulses.
© 2001 Optical Society of America
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