Numerical Modelling of QCW-Pumped Passively Q-Switched Nd:YAG Lasers with Cr⁴⁺:YAG as Saturable Absorber

Passively Q-switched quasi-continuous-wave (QCW) diode-pumped Nd:YAG laser with Cr⁴⁺:YAG as saturable absorber is numerically investigated by solving the coupled rate equations. The threshold pump rate for passively Q-switched QCW-pumped laser is derived. The effects of the pump rate and pump-pulse duration on the laser operation characteristics are studied theoretically. The pump power range can be estimated according to the number of output pulses. The numerical simulation results are in good agreement with the experimental results.