Publication # 017

D. A. B. Miller, "Saturation of Band-Tail Optical Absorption in InSb," Proc. R. Soc. Lond. A379, 91-101 (1982).

The optical absorption in InSb at 5K, in the region just below the bandgap energy, is investigated as a function of the incident intensity by using a continuous wave CO laser. The linear spectrum agrees with previous measurements but saturation is seen at intensities more than about 1 W/cm/sup 2/. In the region where the linear absorption has been ascribed to acceptor-to-conduction-band transitions, the detailed variation of absorption with intensity agrees well with a saturation model developed in this paper. Nearer to the band-gap the absorption shows some saturation at much lower intensities, and a non-saturating absorption tail is also resolved; the implications for possible absorption mechanisms are discussed

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