Sang Jo Lee

TL;DR: In this article, an approximate analytic expression of two wave mixing for absorption and phase gratings in photorefractive materials taking into account self-diffraction effect of two writing beams was developed.

TL;DR: In this paper, the authors observed an orientational photorefractive effect in porphyrin: Zn-doped nematic liquid crystals by measuring two beam coupling gain and diffraction efficiency under the influence of applied electric field.

TL;DR: In this paper, a novel approach to explain the transient behaviors of the photoinduced anisotropy is presented by employing an empirical stretched exponential time response in the course of the trans-cis-trans photoisomerization of azo molecules and is compared with the experimental data, showing excellent agreement.

TL;DR: In this article, the two beam coupling gains in porphyrin are greatly enhanced by adopting the grating translation technique with applying dc electric field, where the maximum gain coefficient of Γ = 624 cm - 1, whose value is at least three times larger than that of no GRating translation, was obtained under the applied dc field of E 0 = 1.2 V / μ m and the GRATING translation speed of v q = 33.4 μ m / s.

TL;DR: In this article, the authors measured two beam coupling gain in porphyrin: Zn-doped nematic liquid crystals with an applied dc field by using the moving grating technique and theoretically derived an expression of the gain coefficient, showing good agreement with the experimental results.