Generalized Model of Passive Q-Switching: Influence of Nonlinear Absorption Anisotropy in Crystalline Switch on Laser Output Parameters

摘要

A model is proposed of passive Q switching in a laser by a crystalline switch with phototropic centres. Expressions for the output energy and duration of a giant pulse are derived taking account of the geometric factor representing the distribution of the orientations of these centres relative to the crystal lattice of the passive switch. The calcualted results are in agreemnet with those obtained in an experimental investigation of passive Q-switching in a neodymium laser with a switch based on a doped LiF:F_2~-orCr~4+:YAG crystal.