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Phase-Resolved Subnanosecond Spectroscopy Using the Beat Frequencies from Mode-Locked Lasers

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Abstract:

It is shown that the beat frequencies inherent to a mode-locked dye laser can be used in phase fluorometry. The fluorescence lifetime of cresyl violet, quenched by KI, is determined with the use of the first two harmonics of a synchronously pumped dye laser. The results from the two frequency components are in excellent agreement. The fluorescence life-time is determined by time-resolved spectroscopy, with the use of the same sample and photomultiplier. The data show that narrower confidence intervals are obtained in the phase-resolved measurement, and this result is attributed to the high phase stability of a cw mode-locked laser.

Keywords: Fluorescence; Mode-locked lasers; Phase fluorometry; Time-resolved spectroscopy

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702884428031

Affiliations: Department of Chemistry, University of Delaware, Newark, Delaware 19716

Publication date: March 1, 1988

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