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Заглавие документа: Optical properties of new indotricarbocyanine dye as a limiter of laser radiation power
Авторы: Svetlichnyi, V. A.
Samtsov, M. P.
Bazyl’, O. K.
Smirnov, O. V.
Mel’nikov, D. G.
Lugovskii, A. P.
Дата публикации: 2007
Издатель: Journal of Applied Spectroscopy. - 2007. - № 4. - С. 524-532.
Аннотация: We present results of experimental and theoretical studies of the optical characteristics of a new indotricarbocyanine dye that is capable of effectively limiting the power of laser radiation in the visible spectral range. The spectral-luminescent and energy characteristics of the dye molecules and their absorption spectra from the excited state with nanosecond resolution are investigated experimentally. Quantum-chemical methods are used to calculate electronic absorption spectra from the ground (S0 → Sn) and excited (S1 → Sn) states and to determine the nature of electronic states of the molecule and the rate constants of intramolecular photo-physical processes. The results of the theoretical research agree with experimental data. It is shown that the investigated dye has singlet-singlet absorption at 400–600 nm. Nonlinear absorption of the dye upon excitation by radiation of the second harmonic of a Nd:YAG laser is studied by z-scanning with an open diaphragm. The ratio of dye absorption cross sections from the excited and ground states at 532 nm is determined in the framework of a three-level model. The results are compared with those for previously studied compounds.
URI документа: http://elib.bsu.by/handle/123456789/20954
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