Abstract

We investigate thermally induced changes in the index of refraction of BaTiO3 that are caused by optical absorption. We show that the absorption of a 900-mW optical beam will change the surface temperature of a BaTiO3 crystal by more than 40°C and cause the extraordinary index of refraction to change by more than 10−2. For a 900-mW beam incident upon a BaTiO3 crystal that is not mounted on a heat sink, the surface temperature and the extraordinary index of refraction are still changing after more than 10 min. We also demonstrate that the thermally induced time-dependent index change is partially responsible for the frequency-shifted return from a two-internal-reflection or Cat self-pumped phase-conjugate mirror that has not reached thermal equilibrium.

© 1991 Optical Society of America

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