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Temperature and spectral dependences of light-induced absorption in photorefractive Bi12TiO20:Ca crystal

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Abstract

We experimentally investigated the temperature dependences of initial (before illumination) value of absorption coefficient of Bi12TiO20:Ca crystal for incoherent radiation of light-emitting diodes. It is established that the initial absorption coefficient at the wavelengths of 570, 505, and 470 nm increases with temperature in the range from 25 to 100°C. The influence of the temperature on the light-induced absorption at 660, 570, 505, and 470 nm in this crystal is investigated using two experimental methods. The first method studies the time dependence of light-induced absorption at constant temperatures. In the second method, the light-induced absorption at a temperature of 25°C is first studied, and then the temperature increases to 100°C. It has been found that stationary values of the absorption coefficient are independent of the experimental method. To explain the temperature and spectral dependences of the initial absorption coefficient, we use improved two-center model considering thermally induced transitions between centers with different light-excitation cross sections.

© 2005 Optical Society of America

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