Low-threshold amplified spontaneous emission and laser emission in a polyfluorene derivative

Liu, X.; Py, C.; Tao, Y.; Li, Y.; Ding, J.; Day, M.
April 2004
Applied Physics Letters;4/12/2004, Vol. 84 Issue 15, p2727
Academic Journal
The amplified spontaneous emission (ASE) and lasing properties of a fluorene copolymer PF3Cz film waveguide were investigated under optical pumping. Low ASE and lasing threshold were observed at 59 W/cm2/pulse and 1.7 KW/cm2/pulse, respectively. The stimulated emission cross section of the PF3Cz film was estimated to be approximately 1.6×10-16 cm2 at the ASE peak of 448 nm. The absorption cross section was estimated to be 2.8×10-16 cm2 at the absorption peak λ=370 nm. Gain and loss measurements at the ASE peak showed that the net gain coefficient reaches 26±1.7 cm-1 when pumped at 1.4 KW/cm2, and the loss coefficient of the waveguide was about 13±1.1 cm-1.


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