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Femtosecond infrared pulses tunable from 9 to 18 µm at an 88-MHz repetition rate

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Abstract

Femtosecond mid-infrared laser pulses that are continuously tunable in the wavelength range from 9 to 18 µm 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 11.5 µm gives a value of 140 fs. The average mid-infrared power of 1 µW is 100 times greater than that for infrared generation by non-phase-matched optical rectification.

© 1998 Optical Society of America

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