%0 Journal Article %J Semiconductor Science and Technology %D 1994 %T FAR-INFRARED SATURATION SPECTROSCOPY OF A SINGLE SQUARE-WELL %A Craig, K. %A Felix, C. L. %A Heyman, J. N. %A Markelz, A. G. %A Sherwin, M. S. %A Campman, K. L. %A Hopkins, P. F. %A Gossard, A. C. %X

We have performed saturation spectroscopy measurements of the lowest intersubband transition in a single 400 angstrom GaAs/Al0.3Ga0.7As modulation-doped square quantum well. We couple intense tunable far-infrared radiation from the Santa Barbara free electron laser into our sample using an edge-coupling technique and measure absorption as a function of frequency and intensity. Saturation and frequency shifts in the absorption line are clearly observed. We attribute the frequency shifts to reductions in the many-body depolarization shift. From our preliminary measurements, we estimate the intersubband relaxation time to be 600 ps to within a factor of three.

%B Semiconductor Science and Technology %V 9 %P 627-629 %8 May %@ 0268-1242 %G eng %M WOS:A1994NM75300061 %! Semicond. Sci. Technol. %R 10.1088/0268-1242/9/5S/061