Reverse saturable absorption and anti-Stokes fluorescence in mesoionic compounds pumped at 532 nm

Reverse saturable absorption and fluorescence in liquid solutions of mesoionic compounds are reported. Intensity-dependent transmittance and anti-Stokes fluorescence were observed when the samples were excited with radiation at 532 nm. The results are attributed to excited-state absorption, and the...

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Bibliographic Details
Published in:Applied optics (2004) 2001-03, Vol.40 (9), p.1389-1395
Main Authors: Rakov, N, de Araújo, C B, Rocha, G B, Simas, A M, Athayde-Filho, P A, Miller, J
Format: Article
Language:English
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Summary:Reverse saturable absorption and fluorescence in liquid solutions of mesoionic compounds are reported. Intensity-dependent transmittance and anti-Stokes fluorescence were observed when the samples were excited with radiation at 532 nm. The results are attributed to excited-state absorption, and the process is understood based on quantum-chemistry calculations that allow the energy levels that correspond to the relevant transitions to be located. A phenomenological description of the nonlinear beam propagation inside the samples is presented, and the nonlinear absorption coefficient as well as the saturation intensity is determined.
ISSN:1559-128X
DOI:10.1364/ao.40.001389