Abstract

A holographic photopolymer based on SU-8 epoxy resin as the binder and trimethylolpropane ethoxylate triacrylate as the monomer with an iodonium salt photoinitiator was studied. A diffraction efficiency of 93% and a refractive index modulation (Δn) of 1.3×102 were obtained from a 16μm thick sample with write beam intensities of 50mWcm2 at a wavelength of 514.5nm, an exposure time of 60s, and a postbaking at 65°C for 1h. The material exhibits good heat resistance in the range from 40°C to 160°C and long projected life.

© 2007 Optical Society of America

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