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Asymmetric Two Beam Coupling with High Optical Gain in External-Field-Free Photorefractive Polymeric Materials

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Abstract

Asymmetric two beam coupling, beam diffraction and holographic recording are investigated in polymeric composites without poling and applying external electric field. Polymer composites consisted of vinyl carbazole based polymers, sensitizer, nonlinear optical (NLO) dye and plasticizer. Gain coefficient and diffraction efficiency largely increased with increasing sensitizer and NLO dye concentration. Highest net gain coefficient of 101.9 cm−1 with optical gain of 224 cm−1 and absorption coefficient of 76.9 cm−1 was obtained and highest diffraction efficiency of 88 % was achieved. Holographic images stored in the polymer composites were clearly read out using a probe beam.

© 2003 Optical Society of America

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