title: Modeling of beam width in passively Q-switched end-pumped lasers.
abstract: An iterative model based on the LambertW function was developed for estimating the fundamental mode parameters of resonators with saturable gain guiding. The process of pulse buildup in passively Qswitched, end-pumped lasers was analyzed. The effective ABCD cavity matrix for consecutive round-trips was calculated, taking into account spatially variable saturated gain in an active medium and absorption bleaching in a saturable absorber. The twofold decrease in beam width, as compared with the fundamental mode of the bare cavity, was demonstrated. The application of such a model for resonators with other nonlinear elements is feasible.
authors.forename: Jan
authors.initials: J
authors.lastname: Jabczyński
authors.forename: Jacek
authors.initials: J
authors.lastname: Kwiatkowski
authors.forename: Waldemar
authors.initials: W
authors.lastname: Zendzian