14 December 1989 Influence Of Protons On The Photorefractive Properties Of LiNbO3
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Proceedings Volume 1126, Electro-Optic and Magneto-Optic Materials and Applications; (1989) https://doi.org/10.1117/12.961375
Event: 1989 International Congress on Optical Science and Engineering, 1989, Paris, France
Abstract
The photorefractive properties of LiNb03:Fe bulk crystals with different proton concentrations and of proton-exchanged planar waveguides fabricated with LiNb03:Fe substrates are investigated. The saturation values of refractive index change, the photoconductivity, the photorefractive sensitivity and the photovoltaic current density of bulk LiNb03:Fe crystals are only determined by the Fe impurities and do not depend on proton concentration. But the dark conductivity is increased by protons. In Li1-xHxNb03 waveguides we find after fabrication a strong decrease of the saturation value of light-induced refractive index change due to an increase of dark conductivity and a decrease of the electrooptic coefficients. Absorption measurements indicate that mainly Fe3+ ions are present in the waveguide region. After annealing photorefractive index changes increase and the dark conductivity decreases again.
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Ralph Sommerfeldt, Eckhard Kratzig, "Influence Of Protons On The Photorefractive Properties Of LiNbO3", Proc. SPIE 1126, Electro-Optic and Magneto-Optic Materials and Applications, (14 December 1989); doi: 10.1117/12.961375; https://doi.org/10.1117/12.961375
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