Journal
APPLIED PHYSICS LETTERS
Volume 84, Issue 22, Pages 4454-4456Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1759384
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We report on the observation of amplified spontaneous emission and random lasing in self-organized crystalline para-sexiphenyl nanofibers. Using subpicosecond excitation, a lasing threshold is observed on the 0-1 emission band near 425 nm at excitation fluences as low as 0.5 muJ/cm(2) (6x10(16) cm(-3) equivalent density), near the onset of density-dependent recombination processes. The dependence of the nonlinear emission spectrum on both the pump intensity and position of the excitation area are attributed to the interplay between random lasing and amplified spontaneous emission occurring along the nanofibers. (C) 2004 American Institute of Physics.
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