Blue-light-emitting polymer lasers with non-periodic circular Bragg resonators

Thomas Wellinger, Christof Pflumm, Jing Becker, Thomas Weimann, Mariano Campoy-Quiles, Paul N. Stavrinou, Ulrich Scherf, Donal D.C. Bradley

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

We present single mode optically pumped lasing from a new resonator structure for polymer lasers employing nonperiodic circular Bragg gratings. Our devices, using a polyfluorene derivative (BN-PFO) as gain medium, are the first blue-emitting circular grating semiconductor lasers (either organic or inorganic). They exhibit feature sizes as small as 47 nm and emit azimuthally polarized beams with a spectral linewidth ≈0.2 nm. We find a minimum lasing threshold energy density of 1.2 μJ/cm2 (10 Hz, 8 ns, 355 nm Nd:YAG laser excitation). The quality factor of the resonator modal fields is found to be at least 2200 for these devices.
Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
DOIs
StatePublished - Jun 30 2008
Externally publishedYes

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