Upconversion luminescence and decay kinetics in a diode-pumped nanocrystalline Nd3+:YVO4 random laser.
Random lasing in nanocrystalline Nd(3+):YVO(4) powder is demonstrated. A method that analyzes the decay kinetics after long-pulse excitation is used to determine the laser characteristics. This method permits to measure the fractional contribution of spontaneous and stimulated emission as well as upconversion as a function of the pump intensity. We observed that maximum linewidth narrowing is achieved when the stimulated emission reaches 50% of fractional contribution in the backscattering cone.
Centro de Lasers e Aplicações, Instituto de Pesquisas Energéticas e Nucleares IPEN-CNEN/SP, Av Lineu Prestes 2242, 005508-000 São Paulo, Brazil.
Renato Juliani Ribamar
RJ
Vieira
Laércio
L
Gomes
José Roberto
JR
Martinelli
Niklaus Ursus
NU
Wetter
D003460:Crystallization; D004867:Equipment Design; D019544:Equipment Failure Analysis; D053844:Lasers, Solid-State; D049329:Nanostructures / Q000737:chemistry*