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Please use this identifier to cite or link to this item: http://dyuthi.cusat.ac.in/purl/2420

Title: Light amplification in dye doped polymer films
Authors: Ritty J, Nedumpara
Geetha, K
Dann, V J
Vallabhan, C P G
Nampoori, V P N
Radhakrishnan, P
Technology
Keywords: dye doped polymer films
spectral narrowing
resonant modes
Issue Date: 2007
Publisher: IOP Publishing
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/2420
Appears in Collections:Dr.C P Girijavallabhan

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