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17 September 2002 Two-color photorefractive holography in Mn-doped near-stoichiometric lithium niobate crystals
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Holograms are recorded in near-stoichiometric LiNbO3 doped with 8 ppm of Mn by use of two-color holographic recording method, where an IR laser of 778 nm is used for writing and an UV laser of 350 nm is used for gating. Dependences of two-color sensitivity and M/# on gating and writing intensities are presented. Significant improvements of sensitivity, M/# and dark decay are obtained compared with reduced near-stoichiometric LiNbO3. To our knowledge, the measured two-color sensitivity of 0.21 cm/J with a gating intensity of 1.5 W/cm2 is the highest among the values reported so far, which is attributed to large light-induced absorption of small polarons. 50 plane-wave holograms are recorded by the conventional angle-multiplexing method.
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Youwen Liu, Kenji Kitamura, Shunji Takekawa, Masaru Nakamura, Ganesan Ravi, Hideki Hatano, and Takashi Yamaji "Two-color photorefractive holography in Mn-doped near-stoichiometric lithium niobate crystals", Proc. SPIE 4930, Advanced Optical Storage Technology, (17 September 2002);

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