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Proceedings Paper

Role of ionic grating in self-enhanced readout from a thermally fixed grating in a photorefractive barium titanate crystal
Author(s): Yasuo Tomita; Shun-suke Matsushima; Osamu Miyazaki
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Paper Abstract

We investigate role of temperature-dependent ionic and re- created photocarrier (hole) gratings in self-enhanced readout from thermally fixed holographic gratings in undoped barium titanate. It is shown that the temperature dependence of the diffraction efficiency below approximately 80 degrees Celsius is mainly determined by temperature-dependent behavior of the dielectric and electro-optic constants. On the other hand, the trend of the ionic grating predominantly determines the temperature dependence of the diffraction efficiency above approximately 80 degrees Celsius even though a magnitude of the hole grating monotonically increases and is more than ten times larger than that of the ionic grating. This finding explains origin of the previously reported behavior of the temperature-dependent diffraction efficiency in barium titanate [D. Zhang et al., Appl. Opt. 34, 5241(1995)]. An activation energy of the mobile ions is also determined to be 1.05 eV from which shelf life is estimated to be over 150 days at 25 degrees Celsius.

Paper Details

Date Published: 22 September 1997
PDF: 8 pages
Proc. SPIE 3137, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications III, (22 September 1997); doi: 10.1117/12.279185
Show Author Affiliations
Yasuo Tomita, Univ. of Electro-Communications (Japan)
Shun-suke Matsushima, Univ. of Electro-Communications (Japan)
Osamu Miyazaki, Univ. of Electro-Communications (Japan)


Published in SPIE Proceedings Vol. 3137:
Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications III
Francis T. S. Yu; Shizhuo Yin, Editor(s)

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