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Proceedings Paper

Light amplification and lasing in doped polymer optical fibers
Author(s): Takeyuki Kobayashi; Werner J. Blau; Hartwig Tillmann; Hans-Heinrich Hoerhold
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Paper 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.

Paper Details

Date Published: 27 August 2003
PDF: 8 pages
Proc. SPIE 4876, Opto-Ireland 2002: Optics and Photonics Technologies and Applications, (27 August 2003); doi: 10.1117/12.463699
Show Author Affiliations
Takeyuki Kobayashi, Trinity College Dublin (Ireland)
Werner J. Blau, Trinity College Dublin (Ireland)
Hartwig Tillmann, Friedrich-Schiller-Univ. Jena (Germany)
Hans-Heinrich Hoerhold, Friedrich-Schiller-Univ. Jena (Germany)

Published in SPIE Proceedings Vol. 4876:
Opto-Ireland 2002: Optics and Photonics Technologies and Applications
Vincent Toal; Norman Douglas McMillan; Gerard M. O'Connor; Eon O'Mongain; Austin F. Duke; John F. Donegan; James A. McLaughlin; Brian D. MacCraith; Werner J. Blau, Editor(s)

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