Journal
LASER PHYSICS LETTERS
Volume 9, Issue 6, Pages 426-433Publisher
IOP PUBLISHING LTD
DOI: 10.7452/lapl.201210019
Keywords
Hemicyanines; spectral anomalies; laser emission
Categories
Funding
- Ministerio de Economia y Competitividad (MINECO) [MAT2010-20646-C04-01, MAT2010-20646-C04-04, TRACE 2009-0144]
- Gobierno Vasco projects [IT339-10]
- MINECO
- Fondo Social Europeo
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In this paper we identify the origin of a novel and singular laser behavior of the hemicyanine dye LDS 722 transversally pumped at 532 nm. With lasing efficiencies as high as 43%, in spite of the fluorescence quantum yields being as low as 0.075, the laser spectra exhibit a finely structured spectral profile, with a periodic modulation with peak separation 0.4 nm, not related to mode selection due to spatial or spectral hole burning. The correlation of the LDS 722 lasing behavior as a function of both environmental properties (polarity, viscosity, protic character of the solvent) and pumping conditions (cavity configuration, pump geometry and energy) with its photophysical properties provides inklings to understand the physics responsible for the peculiar laser behavior in these rather complex dyes. (C) 2012 by Astro, Ltd.
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