Numerical Analysis of a Lasing Output for the Quasi _ Three _ Level Thin Disk Lasers

This paper reports theoretical treatment to drive the general equation for laser threshold power ($P_{pump}^{th}$), the efficiency (η) and the laser out power (P_out) in thin disk laser with a quasi-three–level pump plan by using the analytical solution of the rate equation for this laser system. In order to find a numerical solution, MATLAB program has been used. When a diode pumped high power, continuous wave to the Nd³⁺: YAG thin disc laser operated in a quasi-three-level. The pumping wavelength was (808 nm) and the laser wavelength was (946 nm) at Nd³⁺ doping concentration of 0.6 at %. While at (M² = 1.005), this laser is operated in a single mode, all the laser output power and efficiency have increased with increasing the pumping power. (paper)