Abstract
We measure the efficiency of converting high-power 15-fs pulses to the mid infrared in GaAs and GaSe as well as the pulse duration and the spectrum of the infrared radiation that is produced. Free-carrier production limits the conversion efficiency in GaAs to approximately , allowing us to produce 2.5-pJ, 30-fs pulses spanning the spectral range from 6 to . In GaSe we obtain, in a moderately saturated regime, a conversion efficiency of , limited by two-photon absorption, allowing us to produce pulses of 100-fs duration containing 10 nJ of energy.
© 2001 Optical Society of America
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