1 March 2008 Blue polymer optical fiber amplifiers based on conjugated fluorene oligomers
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We fabricated polymer optical fiber (POF) amplifiers operating between 440 and 480 nm, using POFs doped with a series of fluorene oligomers, including tri-, penta-(9,9-dioctylfluorene) and hepta-(9,9-dihexylfluorene). The gain properties of pure oligofluorene films demonstrate gain coefficients on the order of 250 dB/cm and amplified spontaneous emission thresholds between 1 and 8 μJ cm-2, significantly lower than other fluorene gain media. The optical and morphological characteristics of PMMA thin films doped with the oligomers demonstrate that the oligomers are largely isolated within the PMMA. The optical and gain properties of POFs produced using an adapted preform-drawing technique and doped with the oligofluorenes provide gain values on the order of 0.07 dB for 2 mm of doped POF. The oligofluorenes are largely isolated within the POFs, paving the way for all optical gain-switching.
Jenny Clark, Jenny Clark, Luca Bazzana, Luca Bazzana, Donal D. C. Bradley, Donal D. C. Bradley, Juan Cabanillas-Gonzalez, Juan Cabanillas-Gonzalez, Guglielmo Lanzani, Guglielmo Lanzani, David George Lidzey, David George Lidzey, Jorge M. Morgado, Jorge M. Morgado, Alessandro Nocivelli, Alessandro Nocivelli, Wing Chung Tsoi, Wing Chung Tsoi, Tersilla Virgili, Tersilla Virgili, Ruidong Xia, Ruidong Xia, } "Blue polymer optical fiber amplifiers based on conjugated fluorene oligomers," Journal of Nanophotonics 2(1), 023504 (1 March 2008). https://doi.org/10.1117/1.2902341 . Submission:

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