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Published August 30, 1993 | public
Journal Article Open

Terahertz four-wave mixing spectroscopy for study of ultrafast dynamics in a semiconductor optical amplifier


Ultrafast dynamics in a 1.5-µm tensile-strained quantum-well optical amplifier has been studied by highly nondegenerate four-wave mixing at detuning frequencies up to 1.7 THz. Frequency response data indicate the presence of two ultrafast physical processes with characteristic relaxation lifetimes of 650 fs and <100 fs. The longer time constant is believed to be associated with the dynamic carrier heating effect. This is in agreement with previous time-domain pump-probe measurements using ultrashort optical pulses.

Additional Information

©1993 American Institute of Physics. (Received 2 April 1993; accepted 18 June 1993) This work was supported in part by the Office of Naval Research under Contract No. N000l4-91-1524, and by Northrop Corporation. The authors would also like to thank Dr. Doug Hall of Corning Inc. for critical assistance in the construction of the Er-doped fiber amplifiers used in this experiment.


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