Piezo-optical coefficients of znse and znte above the fundamental gap

The piezo-optical coefficients (Formula presented) and (Formula presented) have been measured for ZnSe and ZnTe above the fundamental gap (in the energy ranges (Formula presented) and (Formula presented) respectively) by using reflectance difference spectroscopy. The measured spectra of (Formula presented) and (Formula presented) show good Kramers-Kronig consistency between their real and imaginary parts. Values for the deformation potentials (Formula presented) (Formula presented) and (Formula presented) for the (Formula presented) and (Formula presented) transitions were estimated by fitting the spectral dependence of (Formula presented) and (Formula presented) to analytical line shapes based on a one-electron approximation. © 1999 The American Physical Society.

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