Wang Na Na, Li Feng, Wang Xiang Lin, Hu Xiao Hong, Wang Yi Shan, Zhao Wei
Appl Opt. 2020 Sep 20;59(27):8106-8110. doi: 10.1364/AO.399680.
We demonstrate a high-power, high-energy chirped-pulse amplification (CPA) system based on three Yb:YAG amplifiers and a chirped-volume Bragg grating (CVBG). With an all-fiber laser as the seed light, a Yb:YAG rod amplifier and two Yb:YAG single-crystal fiber (SCF) amplifiers as the amplification stages, a laser power of 96 W at 200 kHz repetition rate corresponding to a pulse energy of 0.48 mJ has been generated. The stability of different output power has been measured and compared. To the best of our knowledge, this is the first report on a stable 100 W-level laser with sub-mJ pulse energy based on SCF. The beam quality of different output lasers has also been measured, which is below 1.55 when the output power is 92 W. The amplified laser is seeded into the CVBG to be compressed, and a compression efficiency of 0.724 has been obtained with an output power of 67.8 W and pulse duration of 2.5 ps. The ultrafast CPA system delivering high pulse energy (sub-mJ) with hundreds of kHz repetition rate is expected to be used as the driving source of high-flux high-harmonic generation after further compression.
我们展示了一种基于三个镱铝石榴石（Yb:YAG）放大器和一个啁啾体布拉格光栅（CVBG）的高功率、高能量啁啾脉冲放大（CPA）系统。以全光纤激光器作为种子光，采用一个Yb:YAG棒状放大器和两个Yb:YAG单晶光纤（SCF）放大器作为放大级，在200 kHz重复频率下产生了96 W的激光功率，对应脉冲能量为0.48 mJ。测量并比较了不同输出功率的稳定性。据我们所知，这是关于基于SCF的具有亚毫焦脉冲能量的稳定100 W级激光器的首次报道。还测量了不同输出激光的光束质量，当输出功率为92 W时，光束质量低于1.55。将放大后的激光注入CVBG进行压缩，在输出功率为67.8 W、脉冲持续时间为2.5 ps时获得了0.724的压缩效率。预计这种能以数百kHz重复频率提供高脉冲能量（亚毫焦）的超快CPA系统在进一步压缩后可作为高通量高次谐波产生的驱动源。
