TITLE

Highly efficient mirrorless laser-like emission in an organic molecular salt

AUTHOR(S)
Bhowmik, Achintya K.; Dharmadhikari, Aditya; Thakur, Mrinal
PUB. DATE
August 2001
SOURCE
Applied Physics Letters;8/6/2001, Vol. 79 Issue 6
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Unusually high conversion efficiency in laser-like emission has been observed in solutions of an organic molecular salt, styrylpyridinium cyanine dye, at a low threshold input pulse energy. Pumped with frequency-doubled 55 ps pulses from a Nd:YAG laser, a conversion efficiency as high as 40% was achieved without incorporating external mirrors. The spectrally narrowed output beam was observed to be polarized and having a low divergence. The exceptionally low threshold (<1 μJ with excitation area ∼5 mm[sup 2]) and high conversion efficiency at a high molar concentration in spite of a very small photoluminescence quantum efficiency (<0.3%) can be attributed to the large dipole moments associated with the charge-transfer transitions of these molecules favoring strong cooperative emission. © 2001 American Institute of Physics.
ACCESSION #
4936939

 

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