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Proceedings Paper

Near-infrared laser emission from high-Q polymer cavities
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Paper Abstract

We study light amplification and laser emission in polymer gain media containing a near-infrared emitting dye, 2-(6-(4-dimethylaminophenyl)-2,4-neopentylene-1,3,5-hexatrienyl)-3-methyl-benzothiazolium perchlorat, with a view to the development of polymer amplifiers and lasers operating in the 800-nm region of the spectrum. Nanosecond gain spectroscopy is carried out by use of amplified spontaneous emission. Multimoded poly(1-vinyl-2-pyrrolidone)-base planar waveguides, 50 μm in thickness, doped with 0.5 wt% dye show a moderate net small-signal gain coefficient of 2.6±0.3 cm-1 (11.3±1.3 dB/cm) at 820 nm for the pump fluence of 115 μJ/cm2 (23.1 kW/cm2). Moreover, we have fabricated polymer microring cavities 200 μm in diameter with the same material composition. The moderate optical gain in the material allows laser emission to occur at around 840 nm under transverse nanosecond photoexcitation at 532 nm. The threshold for lasing is found to be 311 μJ/cm2 (62.2 kW/cm2).

Paper Details

Date Published: 29 September 2005
PDF: 7 pages
Proc. SPIE 5956, Integrated Optics: Theory and Applications, 59560A (29 September 2005); doi: 10.1117/12.623208
Show Author Affiliations
Takeyuki Kobayashi, Trinity College Dublin (Ireland)
Martin Djiango, Trinity College Dublin (Ireland)
Grace Jordan, Trinity College Dublin (Ireland)
Manuel Rüther, Trinity College Dublin (Ireland)
Werner J. Blau, Trinity College Dublin (Ireland)
Yasuhiro Suzuki, Tohoku Univ. (Japan)
Toshikuni Kaino, Tohoku Univ. (Japan)

Published in SPIE Proceedings Vol. 5956:
Integrated Optics: Theory and Applications
Tadeusz Pustelny; Paul V. Lambeck; Christophe Gorecki, Editor(s)

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