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29 September 2005 Near-infrared laser emission from high-Q polymer cavities
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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).
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Takeyuki Kobayashi, Martin Djiango, Grace Jordan, Manuel Rüther, Werner J. Blau, Yasuhiro Suzuki, and Toshikuni Kaino "Near-infrared laser emission from high-Q polymer cavities", Proc. SPIE 5956, Integrated Optics: Theory and Applications, 59560A (29 September 2005);

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