Journal
JOURNAL OF LUMINESCENCE
Volume 112, Issue 1-4, Pages 325-328Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2004.09.101
Keywords
spectrally narrowed emissions; amplified spontaneous emission; superfluorescence
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Spectrally narrowed emission (SNE) in 2,5-bis(4-biphenylyl)thiophene (BPIT) crystals is investigated using fs laser pulse. Two different types of narrowing are observed at different vibronic emission bands with increasing pump intensities. Based on their pump intensity dependence and illumination area dependence, we assign the SNE at 20,200 cm(-1) (P-band) to amplified spontaneous emission (ASE) and the SNE at 21,600 cm(-1) (a-band) to superfluorescence rather than ASE. (c) 2004 Elsevier B.V. All rights reserved.
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