Nonlinear dynamics of a passively Q-switched Nd:YAG/Cr:YAG laser subject to rectangular wave pump modulation

• Published in: Laser physics Vol. 35; no. 7; pp. 75401 - 75407
• Main Authors: Sun, Zhaoqi, Bian, Jiayi, Wang, Qiupin, Xia, Guangqiong, Deng, Tao, Lin, Xiaodong, Wu, Zhengmao, Chen, Jianjun, Fan, Li, Gao, Ziye
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.07.2025
• Subjects: Nd:YAG/Cr:YAG; nonlinear dynamics; passively Q-switched laser; rectangular wave pump modulation
• ISSN: 1054-660X; 1555-6611
• DOI: 10.1088/1555-6611/adebf1

In this work, we theoretically investigate the dynamic behaviors of a passively Q-switched Nd:YAG/Cr:YAG laser under rectangular wave pump modulation. The results show that, fixing the parameter of pump modulation, such as modulation amplitude ( A m ), modulation frequency ( f m ), unmodulated pump rate ( P 0 ) and duty ratio ( DR m ), the passively Q-switched Nd:YAG/Cr:YAG laser can exhibit a variety of nonlinear dynamical behaviors such as period-one (P1), period-two (P2), multi-period and chaotic pulsation. Bifurcation diagrams show that both pulse intensity and pulse frequency display nonlinear dynamics, illustrating an evolution path of quasi-periodic bifurcation. Additionally, mappings uncover the transitions between different dynamic states in the parameter space of the DR m between and other parameters.