Abstract
This paper reports theoretical treatment to drive the general equation for laser threshold power (), the efficiency (η) and the laser out power (Pout) 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.
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