Abstract
Femtosecond mid-infrared laser pulses that are continuously tunable in the wavelength range from 9 to are demonstrated. These nearly bandwidth-limited pulses are generated by phase-matched difference-frequency mixing within the broad spectrum of 20-fs pulses from a mode-locked Ti:sapphire laser in GaSe. A direct determination of the pulse duration at gives a value of 140 fs. The average mid-infrared power of is times greater than that for infrared generation by non-phase-matched optical rectification.
© 1998 Optical Society of America
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