Abstract

A stilbene-containing fluorinated polyimide with high optical and thermal stability was prepared. The photoinduced anisotropy in this polyimide was investigated by measuring its dichroism and photoinduced birefringence. A large photoinduced birefringence $(\Delta n\sim {10}^{-2})$ was achieved in the polymer. Stable and pure polarization phase gratings without surface-relief structure were written in the polymer film by using two orthogonally linearly or circularly polarized $532\mathrm{nm}$ beams. The polarization gratings were studied with a $650\mathrm{nm}$ probe beam by measuring the diffraction efficiency of the probe beam and surveying the conversion of the polarization state of the probe beam.

© 2009 Optical Society of America

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