Abstract

Optically pumped organic semiconductor lasers are fabricated by evaporation of a thin film of tris(8-hydroxyquinoline) aluminum Alq3 molecularly doped with a laser dye on top of a polyester substrate with an embossed grating structure. We achieve low-threshold, longitudinally monomode distributed-feedback laser operation. By varying the film thickness of the organic semiconductor film, we can tune the wavelength of the surface-emitting laser over 44  nm. The low laser threshold allows the use of a very compact all-solid-state pump laser (10 cm long). This concept opens up a way to obtain inexpensive lasers that are tunable over the whole visible range.

© 2001 Optical Society of America

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