Abstract
In the presence of a population inversion, fluorescent lifetimes are reduced as a result of stimulated emission. Effective fluorescent lifetimes have been calculated using a Monte Carlo method for ruby rods with Brewster-angle ends and roughened sides. The calculations take into account the dependence of gain and reflectivity on polarization and the dependence of gain on frequency. The reflection characteristics of the roughened surface are assumed to be those of an ideal diffuse reflector. Results show that effective fluorescent lifetimes are quite insensitive to rod length but strongly dependent on rod diameter. They also indicate the possibility of oscillation in a random mode for rods of sufficiently large diameter.

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