Journal
OPTICS LETTERS
Volume 26, Issue 9, Pages 593-595Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.26.000593
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Optically pumped organic semiconductor lasers are fabricated by evaporation of a thin film of tris(8-hydroxyquinoline) aluminum (Alq(3)) 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 ah-solid-state pump laser (approximate to 10 cm long). This concept opens up a way to obtain inexpensive lasers that are tunable over the whole visible range. (C) 2001 Optical Society of America.
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