Vol. 30, Issue 2-3, pp. 383-399
Abstract
The paper presents optimization of energy and peak power of the pulse of laser with a slow passive Q-switch. The excited states absorption (ESA) in absorber is included in an optimization process. Using the laser model described it is possible to determine optimal values of unsaturated absorber transmission and reflectivity of the output mirror as a function of the normalized initial gain coefficient z and parameter alpha, characterizing the ratio of the absorption cross-section of nonlinear absorber to the emission cross-section of the laser medium. To optimize the passively Q-switched laser the charts and simple analytical formulas, presented in the paper, can be applied. As an example, optimization of energy and peak power of the pulse of Nd:YAG laser, with Cr4+:YAG crystal as passive Q-switch, pumped by 100 W matrix of laser diodes is presented. It has been shown that for laser energy optimization, ESA slightly changes the value of optimal unsaturated absorber transmission and optimal reflectivity of the output mirror of the laser.