College of Science _ University of Kerbala has discussed the M.A thesis which is entitled “Finding out some Rate Equations Parameters for Passively Q_ Switched Lasers Using Optimizing Technology”
Being submitted by Duaa Sabbar Salman, the study aims at finding out optimal values of some rate equation coefficients for a Cr:LiSAF laser system using Cr:YSO4 as a saturable absorber. The rate equations were first solved numerically using Range–Kata method, and then optimization technique was used to determine the optimal values for this system.
The thesis demonstrates that dissolution rate of saturable absorber and the upper laser level decrease with increasing number of particles, leading to increase pulse energy and short pulse duration.

It is recommended that ground-level absorption cross-sectional area of saturable absorber be large, and that the absorber’s dissolution rate be low, to achieve high-energy, short-duration pulses when operating laser systems with a passive switch.