中国激光, 2014, 41 (4): 0402006, 网络出版: 2014-02-28
混合放大100 MHz高重复频率窄脉宽单频激光器 下载: 775次
Single Frequency Laser with 100 MHz Repetition Rate and 1 ns Pulse Width Using Combined Amplification
摘要
利用高速光强度调制器对线宽为70 kHz的单频连续(CW)光纤激光器发出的激光进行调制,获得了100 MHz高重频、1 ns窄脉宽激光输出,调制后脉冲激光的线宽小于0.8 GHz。利用光纤激光放大器和Nd:YVO4固体激光放大器的混合放大装置进行放大,在一级固体激光放大后输出平均功率为13 W,在二级固体激光放大后获得了32.9 W的脉冲激光输出。实验中对调制后单频窄脉宽的小信号激光采用光纤激光放大器进行预放大,预放大输出激光功率达到2 W后采用固体激光放大器放大,从而避免了单频窄脉宽激光在光纤放大器中极易产生的受激散射和放大自发辐射(ASE)所导致的放大器损坏。放大后的激光仍保持了0.8 GHz线宽和1 ns脉宽、100 MHz重频。这样的输出激光在一些特殊要求中可以获得应用。
Abstract
Pulsed laser with 100 MHz repetition rate and 1 ns pulse width is obtained by intensity modulating a continous wave (CW) single frequency fiber laser with 70 kHz line width. The spectrum line width of the modulated pulsed laser is less than 0.8 GHz. A combined amplification setup with a fiber amplifier and two solid-state amplifiers is used to achieve power amplification of the pulsed laser. The output average powers are 13 W and 32.9 W after first and second solid-state laser amplifier, respectively. The small signal of the modulated pulsed laser is firstly amplified up to 2 W by a fiber pre-amplifier. The pre-amplified laser transmits the two solid-state main amplifiers for further power amplification. The combined amplification setup effectively weakens the stimulated scattering and amplified spontaneous emission (ASE) in the fiber amplifier. After amplification, the output laser preserves line width of 0.8 GHz with pulse width of 1 ns and repetition rate of 100 MHz. Such a laser output with single frequency, narrow pulse width and high repletion rate is required in many special applications.
刘崇, 张翔, 叶志斌, 王毅, 项震, 陈军. 混合放大100 MHz高重复频率窄脉宽单频激光器[J]. 中国激光, 2014, 41(4): 0402006. Liu Chong, Zhang Xiang, Ye Zhibin, Wang Yi, Xiang Zhen, Chen Jun. Single Frequency Laser with 100 MHz Repetition Rate and 1 ns Pulse Width Using Combined Amplification[J]. Chinese Journal of Lasers, 2014, 41(4): 0402006.