16 April 2008 Blue-light-emitting polymer lasers with non-periodic circular Bragg resonators
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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.
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Thomas Wellinger, Thomas Wellinger, Christof Pflumm, Christof Pflumm, Jing Becker, Jing Becker, Thomas Weimann, Thomas Weimann, Mariano Campoy-Quiles, Mariano Campoy-Quiles, Paul N. Stavrinou, Paul N. Stavrinou, Ulrich Scherf, Ulrich Scherf, Donal D. C. Bradley, Donal D. C. Bradley, "Blue-light-emitting polymer lasers with non-periodic circular Bragg resonators", Proc. SPIE 6999, Organic Optoelectronics and Photonics III, 699907 (16 April 2008); doi: 10.1117/12.781033; https://doi.org/10.1117/12.781033

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