Laser Emissions from Disodium Fluorescein-Doped Poly(Vinyl Alcohol) Films


Yap, Seong-Shan and Tou, Teck-Yong and Ng, Seik-Weng (2000) Laser Emissions from Disodium Fluorescein-Doped Poly(Vinyl Alcohol) Films. Japanese Journal of Applied Physics, 39 (Part 1, No. 10). pp. 5855-5858. ISSN 0021-4922

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Superradiant-mode laser emissions were obtained from disodium fluorescein (DF)-doped poly(vinyl alcohol) (PVA) films which had been dip-coated on a microscope glass slide. When the film was transversely pumped using a nitrogen laser, superradiant emission was trapped and propagated in the supporting glass slide which acted as a waveguide. The trapped light underwent multiple internal reflections before it exited at both ends of the slide, producing a lasing effect. The laser beam profile varied with the edge condition of the glass slide; a circular beam was obtained with a frosted edge. An output conversion efficiency of 22% was obtained for a fresh sample while its lasing output energy at a localized excitation position, or operating lifetime, decreased at a rate of 0.015% per shot of nitrogen laser. Despite the decrease in output energy, the laser peak wavelength of DF was largely unchanged.

Item Type: Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Engineering (FOE)
Depositing User: Ms Rosnani Abd Wahab
Date Deposited: 09 Sep 2011 02:43
Last Modified: 11 Nov 2013 04:36


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