In this paper, interband photorefraction was demonstrated in near-stoichiometric LiTaO/sub 3/ at the deep ultraviolet wavelength /spl lambda//sub UV/= 257 nm. The photoconductivity of near-stoichiometric LiTaO/sub 3/ at this wavelength was determined, and Bragg diffraction was investigated. The formation of two distinct grating components, which are most likely associated with free carriers on the one hand and deep traps on the other hand, was observed in depth-resolved measurements. We demonstrate that by controlling the stoichiometry the response time and dynamic range of the interband photorefractive effect can be very much improved. Measured time constants were in the order of a few tens of milliseconds for UV light intensities of about 100 mW/cm/sup 2/, three orders of magnitude faster than time constants reported previously for conventional photorefraction in near-stoichiometric LiTaO/sub 3/ at 364 nm.
Near-stoichiometric and Mg-doped LiTaO/sub 3/ for fast interband photorefraction
2005-01-01
198468 byte
Conference paper
Electronic Resource
English
Interband Photorefraction in Pure and Mg-Doped Near Stoichiometric LiTaO3
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