Laser instabilities in a Gaussian cavity mode with Gaussian pump profile

摘要

We analytically demonstrate that both single-mode and multimode instabilities may occur in a Gaussian-cavity-mode laser model with Gaussian pump profile. As a necessary condition, the ratio of the beam waist to tie pump waist must exceed a given limiting value, which depends on the population decay rate. For an infinitely concentrated pump the plane-wave model instability thresholds are recovered, and there exists an optimum value of the waists ratio for which the second laser threshold is minimum. (C) 1998 Optical Society of America [S0740-3224(98)01104-7]. [References: 28]