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22 September 1997 Local thermal fixing of a photorefractive LiNbO3 hologram by a CO2 laser
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In this paper, an in real time and in situ fixing method by heating with a carbon-dioxide laser beam is suggested to thermally fix a small local hologram in a bulk of Fe:LiNbO3 photorefractive crystal. To form a heating-up to 100 - 200 degree Celsius volume with the shape similar to the laser beam, heat-guiding technique is developed. Based on the heat transfer equations, different heating modes with or without metal absorbers for heat-guiding by using a continuous or pulsed laser beam are analyzed. The optimal mode may be the case of pulsed heating with absorbers. On this basis, experiments are designed and demonstrated. It is seen that the fixing process by carbon-dioxide laser beam is very short compared with the process by oven and the fixing efficiency is quite high.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Bo Liu, Liren Liu, Liangying Xu, Jian Ma, and Sing H. Lee "Local thermal fixing of a photorefractive LiNbO3 hologram by a CO2 laser", Proc. SPIE 3137, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications III, (22 September 1997);

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