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Proceedings Paper

Dye Lasers, The Relation Between Triplet State, Chemical Stability And Hydrogen Bonding
Author(s): Earnest H. Halpern
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Paper Abstract

The triplet state is an energy trap for dye lasers. It is related to the intermediate state in degradation of the dye molecule. Scavengers of the triplet state remove the energy traps but aid in the degradation of the dye since the new singlet state formed by combination of scavenger and triplet state dye molecule is a degraded dye molecule. The return from the triplet state to the singlet state by phosphorescence will not degrade the dye molecule though it is still a trap that decreases the efficiency of the lasing action. The formation of the triplet state with the splitting of the ring structure of the dye molecule (ring containing the carboxyl group) will create new side chains, that can absorb energy due to the rotation vibration modes of the side chains. Hydrogen bonding of the solvent molecules and the dye molecules can restrict this rotation. The hydrogen bonding represents a dipole bond that is an order of magnitude lower in energy than a covalent bond. The solvents used in dye lasers are hydrogen bond forming liquids: water, ethanol, ethylene glycol, glycerol. The chemical stability of the dye laser will depend on the choice of dye molecule and its ability to resist triplet state formation. This is really the chemical stability of the molecule. Those molecules that are most stable will have the least tendency to form the triplet state. The use of triplet scavengers is questionable in terms of degradation of the dye molecule while increasing efficiency of lasing action. An explanation will be given of dimer formation of the dye molecule and carbon dioxide formation as one of the degradation products of the dye.

Paper Details

Date Published: 30 December 1976
PDF: 5 pages
Proc. SPIE 0082, Unconventional Spectroscopy, (30 December 1976); doi: 10.1117/12.954868
Show Author Affiliations
Earnest H. Halpern, David W. Taylor Naval Ship Research and Development Center (United States)


Published in SPIE Proceedings Vol. 0082:
Unconventional Spectroscopy
J. Morris Weinberg, Editor(s)

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