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

C. Karnutsch, C. Pflumm, G. Heliotis, J. C. DeMello, D. D.C. Bradley, J. Wang, T. Weimann, V. Haug, C. Gärtner, U. Lemmer

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80 Scopus citations

Abstract

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/cm2) was realized with this resonator concept. © 2007 American Institute of Physics.
Original languageEnglish (US)
JournalApplied Physics Letters
Volume90
Issue number13
DOIs
StatePublished - Apr 8 2007
Externally publishedYes

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