Disappearance of relaxation oscillation frequencies in a multimode solid-state laser

We study analytically the Tang, Statz and deMars rate equations describing a solid-state Fabry-Perot laser. When the modes have equal gains, there is a critical number of lasing modes, above which the low-frequency relaxation oscillations responsible for antiphase dynamics disappear. These results are generalized to include unequal modal gains resulting from a Lorentzian gain profile.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Intensity coherence of a multimode Nd-doped yttrium aluminum garnet laser

We measure the power spectral densities, at relaxation oscillation frequencies, of the individual longitudinal modes and the total intensity of a Nd-doped yttrium aluminum garnet laser at low pumping rate. We then test relationships between these quantities that are derived from the modal rate equations theory. The theoretical relations for the two mode case are confirmed by the experiment. However, in the three-mode regime, theory and experiments do not agree well. 5555 2002 The American Physical Society.SCOPUS: ar.jinfo:eu-repo/semantics/publishe