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Open AccessFeature PaperArticle

Fluorescence and Time-Delayed Lasing during Single Laser Pulse Excitation of a Pendant mm-Sized Dye Droplet

1
National Institute for Laser, Plasma and Radiation Physics, 077125 Magurele, Ilfov, Romania
2
Faculty of Physics, University of Bucharest, 077125 Magurele, Ilfov, Romania
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editors: Cristina Achim, Mioara Bercu and Ana Bratu
Molecules 2019, 24(24), 4464; https://doi.org/10.3390/molecules24244464
Received: 20 November 2019 / Revised: 2 December 2019 / Accepted: 3 December 2019 / Published: 5 December 2019
(This article belongs to the Special Issue Applications of Photoacoustic Spectroscopy)
Fluorescence and lasing emission that are produced separately in time during excitation laser pulse for an mm-sized Rhodamine 6G dye-water droplet are reported. The droplet acts as a quasi-spherical closed optical resonator and due to multiple internal reflections, the resonant amplified emission is delayed with respect to fluorescence emission. Measurements of the temporal evolution of the droplet’s emission were performed by varying the signal acquisition gate width and gate delay with respect to the pumping pulse. The droplet emission spectra are structured in two bands which appear one after the other in time: first, the fluorescence emission band which follows pumping laser pulse time shape and then a second band, the lasing band, placed at shorter wavelengths and formed in time after the peak of the pumping laser pulse intensity, on the pulse tail. The lasing threshold pumping intensity is much lower than those for typical dye lasers. View Full-Text
Keywords: laser-induced fluorescence; lasing; laser dye; mm-sized droplets; optical signal sampling laser-induced fluorescence; lasing; laser dye; mm-sized droplets; optical signal sampling
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MDPI and ACS Style

Boni, M.; Andrei, I.R.; Pascu, M.L.; Staicu, A. Fluorescence and Time-Delayed Lasing during Single Laser Pulse Excitation of a Pendant mm-Sized Dye Droplet. Molecules 2019, 24, 4464.

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