Abstract
A novel preparation method of polymer DFB gratings has developed based on photo-polymerization for organic solid-state lasers. A photopolymer formulation sensitive to ultraviolet light is proposed for fabrication of polymer DFB gratings by spin-coating process. A very low surface relief depth ranging from 12.5 to about 1.0 nm has been demonstrated with a refractive index modulation of about 0.012. The experiment results indicate that the polymer DFB gratings are believed to have promising potentials in the fabrication of low-order DFB organic solid-state lasers.
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