Abstract
The nanosecond pulses of a dye laser oscillator based on the excited-state intramolecular proton-transfer reaction (IPT) of salicylamide and 2′-hydroxylphenyl benzimidazole dyes have been studied as a function of several experimental parameters. To explain the operation of this laser a numerical four-level kinetic model was developed until the lasing properties of these dyes, in the presence of a variable oxygen concentration and pumped with a double pulse technique, could be reproduced. This was possible only by assuming that the efficiency of the laser is controlled by the absorption cross-section of a transient state with a lifetime in the nanosecond-picosecond range, which was tentatively identified as a ground state tautomeric species.
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Costela, A., Muñoz, J.M., Douhal, A. et al. Experimental test of a four-level kinetic model for excited-state intramolecular proton transfer dye lasers. Appl. Phys. B 49, 545–552 (1989). https://doi.org/10.1007/BF00324955
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DOI: https://doi.org/10.1007/BF00324955