Abstract
Room-temperature Cr 4+:forsterite lasers experience deterioration in continuous-wave power performance due to thermal loading caused by the temperature-dependent fluorescence lifetime and the low heat conductivity of the host. The study presented in this paper uses a numerical model to analyze the experimental threshold and efficiency data of Cr 4+:forsterite lasers by accounting for pump-induced thermal gradients, the temperature dependence of the fluorescence lifetime, absorption saturation at the pump wavelength, and excited-state absorption at the lasing wavelength. Very good agreement was obtained between theoretically predicted trends and the experimental data. The best-fit values of the stimulated emission cross-section and the excited-state absorption cross-section were determined to be 1.16×10 −19 cm 2 and 0.18×10 −19 cm 2, respectively. Optimization studies further predict that at an incident pump power of 8 W, a 2-cm-long Cr 4+:forsterite crystal with a differential absorption coefficient of 0.31 cm −1 should produce the highest continuous-wave output around room temperature.
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