Laser Emissions from Disodium Fluorescein-Doped Poly(Vinyl Alcohol) Films
Document Type
Article
Publication Date
1-1-2000
Abstract
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.
Keywords
Disodium fluorescein, Laser emission, Lasing effect, Nitrogen laser, Photostability
Divisions
CHEMISTRY
Publication Title
Japanese Journal of Applied Physics
Volume
39
Issue
Part 1
Publisher
IOP Publishing