Elastooptic Properties of InP

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Abstract
All of the elastooptic coefficients p 11, p 12 and p 44 in InP have been measured in the wavelength region from 1.06 µm to 1.50 µm at room temperature. The measurement has been carried out by the Dixon-Cohen method, but correction of acoustic wave diffraction, which causes large error in a measurement especially under the Raman-Nath diffraction condition, is made using a simple approximation. InP has a large acoustooptic figure of merit comparable to that of GaAs. Using the obtained elastooptic coefficients, dispersion of strain-optic coefficients has been derived. The deformation potentials estimated from this analysis are a≃-(11±3) eV, b≃-(1.5±1.5) eV and d≃-(2.8±1.2) eV.