title: Kinetics of two wave mixing gain for moving grating technique in photorefractive BaTiO3 crystal.
abstract: We present analytic expressions for time-dependent space charge field and two wave mixing gain under the external applied field accompanying the grating translation. The variations of complex space charge field are analyzed in a complex plane, and the explicit expressions for the resonance and optimum frequencies (or moving grating velocities), which maximize the magnitude and imaginary part of space charge field, respectively, are also obtained. In addition, two wave mixing experiment was conducted with a grating translation technique without the external applied field in a BaTiO(3) crystal and the transient behaviors of measured gain look like damped harmonic oscillations, showing excellent agreement with the theory for the entire time range.
authors.affiliation: Department of Physics, Yeungnam University, Kyongsan 712-749, Korea.
authors.forename: Sang Jo
authors.initials: SJ
authors.lastname: Lee
authors.forename: Hye Ri
authors.initials: HR
authors.lastname: Yang
authors.forename: Eun Ju
authors.initials: EJ
authors.lastname: Kim
authors.forename: Yeung Lak
authors.initials: YL
authors.lastname: Lee
authors.forename: Chong Hoon
authors.initials: CH
authors.lastname: Kwak