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Gain coefficient method for amplified spontaneous emission in thin waveguided film of a conjugated polymer
10.M. D. McGehee, M. A. Díaz-García, F. Hide, R. Gupta, E. K. Miller, D. Moses, and A. J. Heeger, Appl. Phys. Lett. 72, 1536 (1998).
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A method based on the unidimensional gain equation has been developed in order to fit the experimental data due to amplification of spontaneous emission in a thin film of conjugated polymer waveguide. The results have confirmed not only a dependence of the gain coefficient on the laser intensity but also on the length of the excitation laser stripe. The results are presented as a function of the average intensity in , which is a manner to express the threshold intensity for a direct comparison between different materials, independent of the setup used.
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