Table of Contents
Laser Chemistry
Volume 10, Issue 4, Pages 247-258

Anionic and Zwitterionic Photophysical Effects in Some Pyridinium Oxazole Laser Dyes

1Chemistry Division, Research Department Naval Weapons Center, China Lake 93555, CA, USA
2Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale 62901, IL, USA

Received 24 July 1989; Accepted 2 January 1990

Copyright © 1990 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Kauffman and Bentley [Laser Chem. 8, 49-59 (1988)] have reported increased laser output by changing the anion of certain pyridinium oxazole dyes from the tosylate to the mesylate salt. Likewise, zwitterion variants of these dyes are also reported to have a significantly improved laser output. We find anion changes to be modest and, with one exception, all zwitterions tested were no better or not as good as the tosylate salt with respect to lasing output. However, both the mesylate salt and the zwitterion variants have greatly improved lifetimes if there is no fluorine auxochrome in the basic dye. These authors also report observation of bifurcated lasing output curves. We see no such phenomena.