Abstract
The metastable level lifetime of rhodamine 6G in ethanol solution was measured by a dye laser with and without a cyclooctatetraene additive. In contrast to the existing ideas it was shown that the presence of cyclooctatetraene not only fails to decrease but on the contrary increases the lifetime τ T of this dye. The improvement observed in the oscillation properties is expected to be connected with the decrease of the interconversion rate in a rhodamine 6G molecule when it is surrounded by a shell of the cyclooctatetraene molecules.
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