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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 21, Iss. 6 — Jun. 1, 2004
  • pp: 1255–1261

Enhanced photorefractive two-beam coupling in low-Tg polymeric materials with a new device structure

Takafumi Sassa, Tsuyoshi Muto, and Tatsuo Wada  »View Author Affiliations


JOSA B, Vol. 21, Issue 6, pp. 1255-1261 (2004)
http://dx.doi.org/10.1364/JOSAB.21.001255


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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 (Tg). A net gain (Γ-α)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-Tg polymeric materials.

© 2004 Optical Society of America

OCIS Codes
(190.4710) Nonlinear optics : Optical nonlinearities in organic materials
(190.7070) Nonlinear optics : Two-wave mixing

Citation
Takafumi Sassa, Tsuyoshi Muto, and Tatsuo Wada, "Enhanced photorefractive two-beam coupling in low-Tg polymeric materials with a new device structure," J. Opt. Soc. Am. B 21, 1255-1261 (2004)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-21-6-1255

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