We report a study of a new class of organic semiconductor as an optical gain medium. We demonstrate amplification of violet light by use of stimulated emission in a solution of a first-generation bis-fluorene-cored semiconducting dendrimer. Amplification is also observed in the solid state by means of amplified spontaneous emission in an optically pumped dendrimer planar waveguide. Gains of 36 dB cm<sup>-1</sup> at 420 nm and 26 dB cm<sup>-1</sup> at 390 nm in solution and 350 dB cm<sup>-1</sup> in the solid state are obtained. These results show that semiconducting dendrimers have potential as visible laser and amplifier materials.
© 2004 Optical Society of America
(060.2280) Fiber optics and optical communications : Fiber design and fabrication
(060.2300) Fiber optics and optical communications : Fiber measurements
(060.2310) Fiber optics and optical communications : Fiber optics
(230.4000) Optical devices : Microstructure fabrication
Justin R. Lawrence, Graham A. Turnbull, Ifor D. W. Samuel, Gary J. Richards, and Paul L. Burn, "Optical amplification in a first-generation dendritic organic semiconductor," Opt. Lett. 29, 869-871 (2004)