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Author: search.filters.author.Plaipichit, S.Subject: search.filters.subject.photorefractive effect

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    The generation of optical phase conjugation from cerium doped barium titanate at wavelength of 632.8 nm
    (2013-09-18)
    Sidakum, K.
    ;
    Buranasiri, P.
    ;
    Plaipichit, S.
    ;
    Ruttanapun, C.
    ;
    Jindajithawat, P.
    In this paper, optical phase conjugate beam with the using of different resonator configurations has been investigate. Two types of SPPC resonators were selected to use, the first one is linear resonators formed by crystal surface and the other one is linear resonators formed by single mirror and a photorefractive crystal. In our experiment, cerium doped barium titanate crystal (BaTiO3: Ce) and He-Ne laser with wavelength of 632.8 nm have been used. From the results of both cases, the angle of the incident beams is optimum at 37.95° respect to the normal line of the surface that parallel to the c-axis of the crystal. The generating time of OPC beam are 150 seconds and 330 seconds for the first and second type resonators, respectively. The reflection ratios are equal to 8.75% and 5% for the first and second type resonators, respectively (the first type resonators could provide better reflection ratio). © 2013 SPIE.
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    Multi high-order anisotropic self-diffraction in Cerium doped BaTiO 3 crystal
    (2012-03-23)
    Plaipichit, S.
    ;
    Buranasiri, P.
    ;
    Nuansri, R.
    ;
    Neeyakorn, W.
    Higher-order anisotropic self-diffraction up to third orders have been observed in Cerium doped barium titanate by using red beam at 633 nm from He-Ne laser. In our experiment, the third orders and second orders have been observed simultaneously for the first time from our knowledge. From our observation, the phase conjugate beam has not been generated before and after the appearance of higher orders as observing when the green beam from the Argon-ion laser at 514.5 nm has been used. The diffraction efficiency and the decay rate of the grating have been measured as well in the red light case. © 2012 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).