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Proceedings Paper

Quasi-Resonant Optical Nonlinearities And Exciton Dephasing In CdS
Author(s): Mario Dagenais
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Paper Abstract

Detailed measurements of the free exciton dephasing time were performed in high quality CdS platelets at different detunings. A large asymmetry in the detuning dependance of the exciton damping is measured and is explained in terms of the intrinsic properties of exciton-polaritons. Below the transverse A exciton frequency, and at temperatures between 2 and 80 K, the damping is extrinsic in nature and is due to impurities. Above the transverse A exciton frequency, and for temperatures below 80 K, the damping is due to acoustical phonons. Above 80 K, LO-phonon scattering sets in. Nonlinear optical transmission measurements at low intensity (~5kW/cm2) below the A exciton resonance demonstrate the importance of self-broadening of exciton-polaritons.

Paper Details

Date Published: 4 January 1990
PDF: 12 pages
Proc. SPIE 1148, Nonlinear Optical Properties of Materials, (4 January 1990); doi: 10.1117/12.962149
Show Author Affiliations
Mario Dagenais, University of Maryland (United States)

Published in SPIE Proceedings Vol. 1148:
Nonlinear Optical Properties of Materials
Howard R. Schlossberg; Raymond V. Wick, Editor(s)

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