Abstract
The lasing outputs and lifetime constants are reported for the fluorinated azacoumarin dyes, AC2F, AC3F, and AC4F, in a variety of solvents. Most of the tests were made under both air and argon. The best results were obtained using solvents such as ethanol mixed with water or ethylene glycol under air. The dyes AC2F or AC4F gave results that were comparable or superior to those of AC3F. These dyes represent the longest lived of the presently known coumarin laser dyes when used with a solvent capable of hydrogen bonding.
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