量子电子学报, 2016, 33 (5): 545, 网络出版: 2016-10-21
全光纤电光主动调Q激光器
All fiber electro-optic actively Q-switched laser
激光技术 主动调Q Mach-Zehnder电光调制器 多峰现象 laser techniques actively Q-switching Mach-Zehnder electro-optical modulator multi-peak phenomenon
摘要
利用Mach-Zehnder (M-Z)结构的尾纤型铌酸锂(LiNbO3)电光强度调制器作为主动调Q开关元件,采用974nm半导体激光器作为泵浦源,峰值吸收系数为110 dB/m的掺杂铒光纤作为增益介质,实现了1550 nm波长的全光 纤主动调Q激光器。通过电光强度调制器对腔内损耗进行了周期性调制,实现Q开关作用, 获得了稳定的调Q脉冲输出。通过改变泵浦功率和调制频率研究了脉冲宽度和峰值功率的变化 规律,调制频率在50 Hz～88 kHz内调整时可以得到稳定输出脉冲。调制频率为1 kHz时 获得最窄脉冲宽度246 ns, 峰值功率近5 W。
Abstract
The fiber-pigtailed LiNbO3 electro-optical modulator with Mach-Zehnder(M-Z) structure is used as the active Q switching element. The all fiber active Q-switched laser at 1550 nm is realized with 974 nm diode laser as pump source and Yb-doped fiber with 110 dB/m peak absorption coefficient as gain medium. The periodic modulation of cavity loss is carried out with electro-optic intensity modulator. Q-switching action is realized and the stable Q-switched pulse output is obtained. The change laws of pulse width and peak power are investigated by changing pump power and modulation frequency. The stable output pulse can be obtained when the modulation frequency is adjusted from 50 Hz to 88 kHz. The most narrow pulse width of 246 ns and peak power about 5 W are obtained when the modulation frequency is 1 kHz.
周哲, 陈国梁, 许立新, 顾春, 赵威. 全光纤电光主动调Q激光器[J]. 量子电子学报, 2016, 33(5): 545. ZHOU Zhe, CHEN Guoliang, XU Lixin, GU Chun, ZHAO Wei. All fiber electro-optic actively Q-switched laser[J]. Chinese Journal of Quantum Electronics, 2016, 33(5): 545.
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