Abstract

Coherent amplification was observed in an optical structure with multilayer C60 doped nematic films, in which photorefractive gratings working in the Raman–Nath regime were created, leading to an asymmetric energy transfer in two-beam coupling. This multilayer optical structure exhibited exponential dependence of the signal gain on the number of nematic layers when higher-order diffractions were negligibly small. A gain of the 0.1μW signal as high as 4000 was achieved in the six-layer sample at a low dc voltage of 1.2V and a low pump beam power of 8mW. The gain of this ultrahigh sensitive six-layer sample depended strongly on the pump to signal beam power ratio as well as the power of the signal.

© 2009 Optical Society of America

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