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Reduced space-charge fields in near-stoichiometric LiTaO3 for blue, violet, and near-ultraviolet light beams |
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| Authors: | M Jazbinšek M Zgonik S Takekawa M Nakamura K Kitamura H Hatano |
| Institution: | Institute of Quantum Electronics, Swiss Federal Institute of Technology, ETH H?nggerberg, HPF-E12, 8093 Zürich, Switzerland, CH Faculty of Mathematics and Physics, University of Ljubljana and ‘J. Stefan’ Institute, Jamova 39, Ljubljana 1000, Slovenia, SI National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, JP Corporate R&D Laboratories, Pioneer, 6-1-1 Fujimi, Tsurugashima 350-2288, Japan, JP |
| Abstract: | The wavelength dependence of the space-charge field as induced in near-stoichiometric LiTaO3 crystals is investigated by measuring the bulk photogalvanic effect and the photoconductivity. LiTaO3 crystals of composition nearer to stoichiometry exhibit a pronounced reduction of the saturated space-charge field, which results from a larger increase in the photoconductivity relative to the photogalvanic effect. Especially, at near-UV wavelengths, the saturated space-charge field of the order of 0.1 kV/cm reaches a minimum that is two orders of magnitude lower than typical values observed in undoped near-stoichiometric LiNbO3. Received: 11 July 2002 / Revised version: 2 September 2002 / Published online: 20 December 2002 RID="*" ID="*"Corresponding author. Fax: +41-1/633-1056, E-mail: mojca@fiz.uni-lj.si |
| Keywords: | PACS: 42 70 Nq 61 50 Nw 78 20 -e |
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