Photorefractive properties of nonstoichiometric Bi12GeO20 crystals

H. Vogt; K. Buse; H. Hesse; E. Krätzig; R. Ramos García

doi:10.1364/PEMD.2001.496

Photorefractive Effects, Materials, and Devices
OSA Trends in Optics and Photonics (Optica Publishing Group, 2001),
paper 496
•https://doi.org/10.1364/PEMD.2001.496

Photorefractive properties of nonstoichiometric Bi₁₂GeO₂₀ crystals

H. Vogt, K. Buse, H. Hesse, E. Krätzig, and R. Ramos García

Photorefractive Effects, Materials, and Devices 2001

Delavan, Wisconsin United States
ISBN: 1-55752-693-1

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Properties of Photorefractive Crystals (PPC)

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H. Vogt, K. Buse, H. Hesse, E. Krätzig, and R. R. García, "Photorefractive properties of nonstoichiometric Bi12GeO20 crystals," in Photorefractive Effects, Materials, and Devices, G. Salamo and A. Siahmakoun, eds., Vol. 62 of OSA Trends in Optics and Photonics (Optica Publishing Group, 2001), paper 496.

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Abstract

We have grown Bi₁₂GeO₂₀ single crystals from melts of different GeO₂ content. The absorption of the crystals increases with decreasing GeO₂ content in the melt. Furthermore, the samples show a significant variation of the photoconductivity and the effective trap density. Our results can be described by a one-center model with the intrinsic antisite defect Bi_Ge (Bi^3+/4+ on Ge site associated with a hole) as dominant photorefractive center.

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