Charge transport properties of undoped congruent lithium niobate crystals |
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Authors: | M?K?sters C?Becher D?Haertle B?Sturman K?Buse |
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Institution: | 1.Institute of Physics,University of Bonn,Bonn,Germany;2.Institute of Automation and Electrometry,Novosibirsk,Russia |
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Abstract: | Time-resolved light-induced birefringence measurements based on a phase compensation technique are used to determine the charge
transport properties of congruent, nominally-undoped lithium niobate crystals (LiNbO3). Some of the crystals are conventionally oxidized. The steady-state space-charge field E
pv, the bulk photovoltaic coefficient β, and the photoconductivity σ
ph are determined in the intensity range (30–30 000) W/cm2. The photovoltaic coefficient β increases by one order of magnitude over this intensity range, the space-charge field E
pv even by two orders of magnitude. We discuss the results in the context of the known one- and two-center charge transport
models for LiNbO3. The experimental findings presented here are of relevance for the long-standing problem of optical damage in such crystals,
which inhibits their use in high-intensity applications like nonlinear optics. |
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