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Photonics of laser-excited symmetric cationic polymethine dyes

Svetlichnyi, Valerii A and Kopylova, T N and Maier, G V and Lapin, I N and Derevyanko, Nadezhda A and Ishchenko, Aleksandr A (2007) Photonics of laser-excited symmetric cationic polymethine dyes. Quantum Electronics, 37 (2). pp. 118-123.

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Efficient lasing is obtained in the visible and near-IR spectral regions in solutions of symmetric polymethine dyes of the indolenine series (indocyanines) pumped by the second harmonic of a Nd3+:YAG laser at 532 nm and an exciplex XeCl* laser at 308 nm into the first (long-wavelength) and higher-lying electronic absorption bands. The quantum lasing efficiency upon UV excitation achieves 37%. It is shown that these dyes can also limit the radiation power of these lasers. Polymethine dyes limit especially efficiently the second-harmonic power, their attenuation factor for the radiation power density of 100 MW cm-2 achieving 14. The nanosecond flash-photolysis study of transient absorption spectra showed that the radiation power is limited by the mechanism of reverse saturated singlet-singlet absorption. It is established that the limiting ability of polymethines strongly depends on their structure.

Item Type:Article
ID Code:5353
Deposited By:Prof. Alexey Ivanov
Deposited On:06 Feb 2010 11:10
Last Modified:06 Feb 2010 11:53

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