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Pankrath, R.
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article
Characterization of photorefractive BCT:Rh crystals at 1.06µm by two wave mixing
Abstract
We present an experimental investigation of the photorefractive properties of rhodium-doped barium calcium titanate (BCT) crystals of the congruent melting composition Ba0.77Ca0.23TiO3. Considering the results previously obtained on these crystals in the visible region and at 850 nm wavelength, it should be a good alternative to BaTiO3:Rh. Besides, the rhodium doping has the effect of making this material sensitive until the wavelength of 1.06 m, a very technologically significant wavelength, because of the existence of the laser of strong power. Therefore we present here a study of rhodium-doped BCT crystals at 1.06 m. These crystals are characterized by two wave mixing experiments. Two beam coupling gain factors up to 7.5 cm-1 with ordinary polarization and response time of the order of 1s, at incident power of 10 W.cm-2, have been obtained. All the properties are explained with a three-center charge transport model, with the existence of iron impurity, which masks the influence of a rhodium at low doping concentrations