High photorefractive sensitivity in an n-type 45 degrees-cut BaTiO(3) crystal.

We report the beam-coupling properties of a cobalt-doped oxygen-reduced n-type barium titanate crystal in the 0° and 45° crystallographic orientations. Oxygen reduction improved the response time of the 0°-cut crystal by a factor of ~4.5 without diminishing the beam-coupling gain. The 45°-cut crystal has a peak gain of ~38.7 cm−1, a response time of ~21 ms, and a photorefractive sensitivity of 3.44 cm3/kJ. We infer from response time measurements an equivalent percentage change in the dc dielectric constant and the mobility with respect to crystallographic orientation.

[1]  A. Johnston,et al.  Determination of the low-frequency linear electro-optic effect in tetragonal batio sub 3. , 1965 .

[2]  David M. Pepper,et al.  Hybrid phase conjugator/modulators using self‐pumped 0°‐cut and 45°‐cut BaTiO3 crystals , 1986 .

[3]  C. N. Berglund,et al.  Electron Transport in Single-Domain, Ferroelectric Barium Titanate , 1967 .

[4]  R. C. Folweiler,et al.  Top-seeded solution growth of oxide crystals from non-stoichiometric melts , 1971 .

[5]  R. Neurgaonkar,et al.  Large photorefractive coupling coefficient in a thin cerium-doped strontium barium niobate crystal , 1991 .

[6]  Marvin B. Klein,et al.  Optimal Properties Of Photorefractive Materials For Optical Data Processing , 1983 .

[7]  Daniel Mahgerefteh,et al.  Theory of the photorefractive effect for Bi 12 SiO 20 and BaTiO 3 with shallow traps , 1991 .

[8]  Ratnakar R. Neurgaonkar,et al.  Electrooptic and piezoelectric measurements in photorefractive barium titanate and strontium barium niobate , 1987 .

[9]  Robert N. Schwartz,et al.  Photorefractive properties of BaTiO 3 :Co , 1990 .

[10]  S H Lee,et al.  Enhanced photorefractive performance from 45 degrees -cut BaTiO(3). , 1989, Applied optics.

[11]  B. A. Wechsler,et al.  High‐efficiency fast response in photorefractive BaTiO3 at 120 °C , 1988 .

[12]  P. Günter,et al.  High-sensitivity read-write volume holographic storage in reduced KNbO3 crystals , 1980 .

[13]  M. DiDomenico,et al.  Dielectric and optical properties of melt-grown BaTiO3 , 1968 .

[14]  Cardinal Warde,et al.  A method for poling barium titanate, BaTiO3 , 1991 .

[15]  P Yeh,et al.  Diffraction efficiency of strong volume holograms. , 1990, Optics letters.