Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5376660 | Chemical Physics | 2007 | 8 Pages |
Abstract
A linear and nonlinear optical spectroscopic characterization is carried out on three azo dyes (Reactive orange 1, Reactive violet 8, and Acidproof purplish red), and on N-(p-hydroxybenzylidene)-diamino-maleonitrile. Fluorescence quantum distributions, fluorescence quantum yields, and fluorescence lifetimes are measured. The saturable absorption is studied by nonlinear transmission measurements with intense picosecond laser pulses. The ground-state absorption recovery is studied by picosecond time-resolved pump and probe measurements. Absolute ground-state absorption cross-sections, excited-state absorption cross-sections, and dye concentrations are extracted from saturable absorption studies. The azo dyes have fluorescence lifetimes and ground-state absorption recovery times of around 2Â ps and their excited-state absorption cross-sections are small (measured at 527Â nm) making them good mode-locking dyes for picosecond and femtosecond lasers. The investigated diamino-maleonitrile dye exhibits sub-picosecond fluorescence lifetime and slow ground-state absorption recovery (>1Â ns).
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Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
T. Susdorf, A.K. Bansal, A. Penzkofer, Sheng-Li Guo, Jing-Min Shi,