Abstract
The optical-absorption saturation of intersubband transition within the conduction band of GaAs/As multiple quantum wells (MQW’s) has been investigated. The MQW sample grown by molecular-beam epitaxy consists of 50 periods of 70-Å-wide GaAs wells and 178-Å-wide As barriers with x=0.25. The absorption is peaked at 9.49 μm. The infrared radiation from a tunable transversely excited atmosphere laser was to induce the transition between the lower subbands. The saturation intensity obtained is =0.67 MW/. Using our theoretical expression for saturation intensity, we have calculated =0.52 MW/.
- Received 13 July 1992
DOI:https://doi.org/10.1103/PhysRevB.47.6755
©1993 American Physical Society