Abstract
The two beam coupling (TBC) gains in porphyrin:Zn-doped nematic liquid crystals (NLCs) are greatly enhanced by adopting the grating translation technique with applying dc electric field. 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 . Based on the material and torque balance equations for NLCs taking into account the grating translation, we present the theoretical expressions for TBC gain enhancements, showing excellent agreement with the experimental results.
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