Improved organic semiconductor lasers based on a mixed-order distributed feedback resonator design

The authors present organic semiconductor distributed feedback lasers based on thin films of the conjugated polymer poly[9,9-dioctylfluorene-co-9,9-di(4-methoxy-phenyl)fluorene] and employing an improved resonator design. In order to combine the advantages of first- and second-order distributed feed...

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Bibliographic Details
Published in:Applied physics letters 2007-03, Vol.90 (13), p.131104-131104-3
Main Authors: Karnutsch, C., Pflumm, C., Heliotis, G., deMello, J. C., Bradley, D. D. C., Wang, J., Weimann, T., Haug, V., Gärtner, C., Lemmer, U.
Format: Article
Language:English
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Summary:The authors present organic semiconductor distributed feedback lasers based on thin films of the conjugated polymer poly[9,9-dioctylfluorene-co-9,9-di(4-methoxy-phenyl)fluorene] and employing an improved resonator design. In order to combine the advantages of first- and second-order distributed feedback resonators, the authors utilize a mixed-order grating design: A second-order Bragg scattering region that provides efficient vertical outcoupling of the laser radiation is surrounded by first-order scattering regions that give rise to strong feedback. By optimizing the film thickness to obtain laser oscillation at the polymer maximum gain wavelength, a very low laser threshold of 45 pJ ∕ pulse ( ≈ 36 nJ ∕ cm 2 ) was realized with this resonator concept.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2717518