Abstract
Molecules undergoing excited-state intramolecular proton transfer often show transient absorption after pulsed optical excitation, due to the tautomeric form in the singlet ground state. This absorption may be used to suppress, after a short time, the laser action of dyes emitting in the transient absorption band. The method is designed for high photochemical stability. Lasing from PBBO, pumped 10 times above threshold by an excimer pumped PTP dye laser, was suppressed after 3.3ns by the addition of 2-(2′-hydroxyphenyl)-benzoxazole, which absorbed 30% of the pump energy. At higher concentrations, intense and stable 80ps PBBO laser pulses were obtained. The pulse evolution is simulated by model calculations. A hypothetical super-dye, consisting of chemically linked laser- and absorber-moities, is also discussed. Here Förster energy transfer should result in particularly efficient laser pulse shortening.
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Ernsting, N.P., Nikolaus, B. Dye-laser pulse shortening by transient absorption following excited-state intramolecular proton transfer. Appl. Phys. B 39, 155–164 (1986). https://doi.org/10.1007/BF00697413
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DOI: https://doi.org/10.1007/BF00697413