Title: Spontaneous and stimulated emission by Eu-chelate in a planar microcavity
Abstract: Characteristics of spontaneous and stimulated emission by Eu(BFA)4− chelate in a planar microcavity of 2.5λ length are studied experimentally. The spontaneous emission enhancement factor is close to unity. The observed spectral width and the angular divergence of spontaneous emission are consistent with theory. A distinct threshold for the transition from spontaneous to stimulated emission was observed with an associated decrease in the decay time of the emission. The spectral width decreased with increasing pumping power.