22 September 1997 Role of ionic grating in self-enhanced readout from a thermally fixed grating in a photorefractive barium titanate crystal
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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.
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Yasuo Tomita, Yasuo Tomita, Shun-suke Matsushima, Shun-suke Matsushima, Osamu Miyazaki, Osamu Miyazaki, } "Role of ionic grating in self-enhanced readout from a thermally fixed grating in a photorefractive barium titanate crystal", Proc. SPIE 3137, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications III, (22 September 1997); doi: 10.1117/12.279185; https://doi.org/10.1117/12.279185
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