Light amplification in dye doped polymer films

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Light amplification in dye doped polymer films

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Title: Light amplification in dye doped polymer films
Author: Radhakrishnan, P; V P N Nampoori; Girijavallabhan, C P; Ritty J, Nedumpara; Geetha, K; Dann, V J
Abstract: We report unusual spectral narrowing and laser emission from polymer thin films doped with Coumarin 540 dye. The laser emission from the polymer films is found to be highly dependent upon the excitation length of the medium. Even a short length of 1.75 mm of the dye doped film gave rise to laser emission with FWHM of 0.3 nm for a pump intensity of 825 kW cm−2. The partial reflections from the broad lateral surfaces of the free standing films provided the optical feedback for the laser emission. Occurrence of well-resolved equally spaced resonant modes confirmed the effect of a Fabry–Perot-like optical cavity between the film surfaces
URI: http://dyuthi.cusat.ac.in/purl/1789
Date: 2007-01-09


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