A microscope slide acting as a passive waveguide was coated by three separate poly(vinyl alcohol) films that were doped with Coumarin 460, Disodium Fluorescein, and Rhodamine 640 perchlorate. On collinear pumping by a nitrogen laser, these dyes furnished primary red–green–blue laser emissions that were collected and waveguided by the microscope slide but exited from both ends. Frosting the waveguide exit introduced light scattering at the glass–air interface and spatially overlaid the red–green–blue laser emissions that emerged as a uniform white-light beam.
© 2002 Optical Society of America
Seong-Shan Yap, Wee-Ong Siew, Teck-Yong Tou, and Seik-Weng Ng, "Red-Green-Blue Laser Emissions from Dye-Doped Poly(Vinyl Alcohol) Films," Appl. Opt. 41, 1725-1728 (2002)