We report positive optical gain under pulsed excitation in oxidized porous silicon planar waveguides impregnated with Nile Blue (LC 6900). Guided photoluminescence measurements show a dramatic line narrowing and a strong superlinear behaviour of the red emission when the pump power is increased. Variable stripe length (VSL) measurements show a clear transition from losses to gain, with a threshold of ∼3 mJ/cm2 at 700 nm. A maximum gain coefficient of 8.7 cm-1 is reported. © 2007 WILEY-VCH Verlag GmbH & Co. KGaA.
|Titolo:||Optical gain in oxidized porous silicon waveguides impregnated with a laser dye|
|Data di pubblicazione:||2007|
|Appare nelle tipologie:||4.1 Contributo Atti Congressi/Articoli in extenso|