19 October 2000 Temperature-dependent locality of photorefractive hologram fixed by CO2 laser heating
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Abstract
A CO2 laser beam has been suggested to heat the Fe:LiNbO3 to thermally fix a recorded hologram. This optical/thermal method permits to spatially locally and selectively fix, erase or update photorefractive holograms in-situ and in real time. The thermal field distribution in LiNbO3 induced by the heating of a CO2 laser beam is in fact nonuniform, which has an effect on the fixing efficiency for the recorded hologram. In this paper, we developed the relation between the fixed space charge field amplitude Esc and the fixing temperature Tf. Then to evaluate the performance of the recorded and fixed local but nonuniform photorefractive holograms, two parameters of the localization coefficient (Psi) and the average space charge field amplitude Escave are defined, respectively. The relations among local hologram amplitude and locality and the nonuniform temperature field are discussed. An optimum temperature field caused by the CO2 laser heating is achieved. The developed method is suitable for the other boundary conditions and laser beam profiles.
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Jianlang Li, Liren Liu, Huaisheng Wang, Changhe Zhou, "Temperature-dependent locality of photorefractive hologram fixed by CO2 laser heating", Proc. SPIE 4110, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications VI, (19 October 2000); doi: 10.1117/12.404794; https://doi.org/10.1117/12.404794
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