Far-infrared saturation spectroscopy of a single square well
- 1 May 1994
- journal article
- Published by IOP Publishing in Semiconductor Science and Technology
- Vol. 9 (5S), 627-629
- https://doi.org/10.1088/0268-1242/9/5s/061
Abstract
We have performed saturation spectroscopy measurements of the lowest intersubband transition in a single 400 AA 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.Keywords
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