Wei Ming-Dar, Hsu Chih-Chang, Huang Han-Hui, Wu Hsiao-Hua
Department of Electro-Optical Engineering, National Cheng Kung University, Tainan City, Taiwan, China.
Opt Express. 2010 Sep 13;18(19):19977-82. doi: 10.1364/OE.18.019977.
This work demonstrates the suppression of chaos in a Nd:YVO(4) laser by biharmonical pump modulation (the first for chaos-inducing and the second for chaos-suppressing). The laser exhibits chaotic behavior when only the first signal is applied for pump modulation and its frequency is adjusted close to the relaxation-oscillation frequency. Adding the second signal with subhamonic and a specific phase difference to the first modulation signal will reshape the modulated waveform of the pump beam to suppress the aforementioned chaotic behavior. The initial phase of the second harmonic perturbation plays an important role in the suppression of chaos. This result is confirmed by numerical simulation.
这项工作展示了通过双谐波泵浦调制（第一个用于诱导混沌，第二个用于抑制混沌）来抑制Nd:YVO(4)激光器中的混沌。当仅将第一个信号用于泵浦调制且其频率调整到接近弛豫振荡频率时，激光器呈现出混沌行为。向第一个调制信号添加具有次谐波和特定相位差的第二个信号，将重塑泵浦光束的调制波形，以抑制上述混沌行为。二次谐波扰动的初始相位在混沌抑制中起着重要作用。数值模拟证实了这一结果。
