Photonics of laser-excited symmetric cationic polymethine dyes

Journal Article · Wed Feb 28 04:00:00 EST 2007 · Quantum Electronics (Woodbury, N.Y.)

DOI:https://doi.org/10.1070/QE2007V037N02ABEH013314· OSTI ID:21466614

Svetlichnyi, Valerii A; Maier, G V; Lapin, I N ^[1]; Kopylova, T N ^[2]; Derevyanko, Nadezhda A; Ishchenko, Aleksandr A ^[3]

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1. Tomsk State University, Tomsk (Russian Federation)
2. V.D. Kuznetsov Siberian Physical-Technical Institute, Tomsk (Russian Federation)
3. Institute of Organic Chemistry, National Academy of Sciences of Ukraine, Kiev (Ukraine)

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 Nd{sup 3+}: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{sup -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. (active media)

• OSTI ID: 21466614
• Journal Information: Quantum Electronics (Woodbury, N.Y.), Journal Name: Quantum Electronics (Woodbury, N.Y.) Journal Issue: 2 Vol. 37; ISSN 1063-7818
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION
ABSORPTION SPECTRA
ATTENUATION
BOSONS
CHARGED PARTICLES
CHEMICAL REACTIONS
DECOMPOSITION
DISPERSIONS
DYES
EFFICIENCY
ELECTRONS
ELEMENTARY PARTICLES
ENERGY-LEVEL TRANSITIONS
EXCITATION
FERMIONS
HOMOGENEOUS MIXTURES
IONS
LASERS
LEPTONS
MASSLESS PARTICLES
MIXTURES
NEODYMIUM IONS
NEODYMIUM LASERS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
PHOTONS
POWER DENSITY
SOLID STATE LASERS
SOLUTIONS
SORPTION
SPECTRA
WAVELENGTHS