Abstract

Based on the coupled-wave theory, we model the periodic structure and analyze the influence on composite surface-emitting organic distributed feedback (DFB) lasers. Second-order DFB gratings with duty cycles of 0.3, 0.5, and 0.7 patterned by electron-beam lithography were fabricated. The composite active layer consisted of 4-(dicyanomethylene)-2-tert-butyl-6-(1,1,7,7-tetramethyljulolidin-4-yl-vinyl)-4H-pyran (DCJTB) and poly(N-vinylcarbazole) (PVK) spin-cast on a textured surface. Excited with $532\mathrm{nm}$ laser pulses, different lasing characteristics and threshold pumping fluences are exhibited. These are explained by the discrepancy in the coupling coefficients and the threshold gains calculated from the proposed model.

© 2007 Optical Society of America

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