Nonlinear Dynamics of a Passively Q-Switched Nd:YAG/Cr:YAG Laser Under Triangular Wave Pump Modulation

In this work, we theoretically investigate the nonlinear dynamics of a passively Q-switched Nd:YAG/Cr:YAG laser under the triangular wave pump modulation. The influence of the key parameters of the modulation frequency, modulation amplitude, and unmodulated pump rate on the nonlinear dynamics are analyzed. Meanwhile, the nonlinear dynamic evolution routes of the pulse peak and pulse frequency are also determined. The results show that the passively Q-switched Nd:YAG/Cr:YAG laser can exhibit rich nonlinear dynamics, such as period-one (P1), period-two (P2), multi-period (MP), and chaotic pulsation (CP) under some suitable parameters. Furthermore, the nonlinear dynamic evolution routes of pulse peak and pulse frequency exhibit similar trends, but their intensity changes follow opposite directions.