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Effects of time evolution of the laser beam parameters in Gaussian cavities

The evolution of the main parameters of the intracavity laser radiation oscillating in a Gaussian-cavity applied to a XeCl laser, has been experimentally investigated. It has been found that the temporal evolution of the main laser beam parameter was well approximated by the evolution of a Shell-Gaussian model beam propagating in a bare Gaussian cavity, even if the intensity profiles of the oscillating radiation were quite affected by XeCl laser gain characteristics.