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It is shown that the interaction of ultrashort laser pulses with nonsta- tionary semiconductor plasmas can, under appropriate conditions, lead to a variety of interesting phenomena including controlled upshifting of the laser frequency leading to the possibility of tunable lasers in a wide range of fre- quencies, and trapping (nonpropagation) of a substantial part of the incident pulse.

Frequency up-conversion and trapping of ultrashort laser pulses in semiconductor plasmas