期刊
APPLIED PHYSICS LETTERS
卷 90, 期 13, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.2717518
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资金
- Engineering and Physical Sciences Research Council [GR/S96791/01] Funding Source: researchfish
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 (approximate to 36 nJ/cm(2)) was realized with this resonator concept. (c) 2007 American Institute of Physics.
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