Abstract

Large two-beam coupling gain with a low driving voltage and a small grating spacing was observed by use of a novel device structure in a photorefractive polymer with a low glass-transition temperature $(T_g).$ A net gain $(\mathrm{\Gamma }-\alpha )L$ close to 1 was observed for an external electric field of ∼40 V/µm and a grating spacing of 0.42 µm. The enhanced coupling strength was the result of optimized parameters and improved, effective electro-optical coefficient, phase shift, space-charge field, and effective interaction length compared with those of a conventional device structure. Moreover, mechanism for this enhancement of coupling strength was found to be applicable to typical efficient low-$T_g$ polymeric materials.

© 2004 Optical Society of America

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