Local thermal fixing of a photorefractive LiNbO3 hologram by a CO2 laser

Bo Liu; Liren Liu; Liangying Xu; Jian Ma; Sing H. Lee

doi:10.1117/12.279189

22 September 1997 Local thermal fixing of a photorefractive LiNbO₃ hologram by a CO₂ laser

Bo Liu, Liren Liu, Liangying Xu, Jian Ma, Sing H. Lee

Proceedings Volume 3137, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications III; (1997) https://doi.org/10.1117/12.279189
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

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.

Citation Download Citation

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); https://doi.org/10.1117/12.279189

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