27 August 2003 Light amplification and lasing in doped polymer optical fibers
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Abstract
We report on a large optical gain, over the wide spectral range, and lasing in a glass-clad polymer optical fiber that uses a novel highly fluorescent stilbenoid compound, 1,4-bis(4-diphenylamino-styryl)-benzene. The compound has a high quantum yield of 0.85 in polystyrene and a large Stokes shift of about 80 nm. A fiber doped with 0.2-wt. % of the compound is photoexcited with a thin striped shape area at 355 nm with nanosecond optical pulses, and the emission from one end is monitored as a function of the excitation length to deduce the net gain coefficient. The gain spectroscopy has revealed a broad optical gain exceeding 25 cm-1 and up to 36 cm-1 at 494 nm that covers a spectral range of about 70 nm when the fiber is transversely photoexcited at 12 mJ/cm2. The large gain has been utilized to demonstrate blue laser emission at 489 nm from the fiber (which is only 1.4 cm in length) in a low finesse cavity defined by the Fresnel reflections at the fiber-air interfaces. The threshold for lasing is found to be 1.7 mJ/cm2.
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Takeyuki Kobayashi, Takeyuki Kobayashi, Werner J. Blau, Werner J. Blau, Hartwig Tillmann, Hartwig Tillmann, Hans-Heinrich Hoerhold, Hans-Heinrich Hoerhold, } "Light amplification and lasing in doped polymer optical fibers", Proc. SPIE 4876, Opto-Ireland 2002: Optics and Photonics Technologies and Applications, (27 August 2003); doi: 10.1117/12.463699; https://doi.org/10.1117/12.463699
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