Two-dimensional distributed feedback lasers using a broadband, red polyfluorene gain medium

G. Heliotis, R. Xia, D. D.C. Bradley, G. A. Turnbull, I. D.W. Samuel, P. Andrew, W. L. Barnes

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Abstract

We report the fabrication of widely tuneable (627-702 nm) optically pumped two-dimensional distributed feedback polymer lasers that utilize a red-emission fluorene copolymer as the active gain medium. The lasers exhibit efficient, low threshold operation and emit highly directional output beams as a result of the enhanced two-dimensional photonic confinement provided by the employed resonator. Their emission and operating characteristics are described in detail. We demonstrate that the very wide spectral range (Δλ ≥ 75 nm) over which these lasers can be systematically tuned is in very good agreement with theoretical predictions based on a simple waveguide model. In addition, we show that the lasers have long operating lifetimes τ1/2 ≥ 2 × 107 pulses and we discuss the impact that degradation has on the laser output characteristics. © 2004 American Institute of Physics.
Original languageEnglish (US)
JournalJournal of Applied Physics
Volume96
Issue number12
DOIs
StatePublished - Dec 15 2004
Externally publishedYes

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