Lu Xiaoming, Zhang Hui, Li Jinfeng, Leng Yuxin
Opt Lett. 2021 Nov 1;46(21):5320-5323. doi: 10.1364/OL.435145.
We demonstrate the temporal pedestal suppression in a Ti:sapphire chirped-pulse amplification laser system. The far-field spectral phase noise can be avoided by using a stretcher based on two concave mirrors in the system, reducing the intensity and the time range of the amplified pulse's pedestal. At the amplified energy of 1.7 J, the contrast measurement showed that the pedestal intensity was at a level of about 10 within a 10 ps time window near the main pulse. In the proton acceleration experiment, a 10 nm thickness CH target was irradiated by the high-contrast pulse with the focused intensity of ∼1.4×10/, which generated a proton beam with a cutoff energy of 16 MeV.
我们展示了钛宝石啁啾脉冲放大激光系统中的时间基座抑制。通过在系统中使用基于两个凹面镜的展宽器，可以避免远场光谱相位噪声，从而降低放大脉冲基座的强度和时间范围。在放大能量为1.7 J时，对比度测量表明，在主脉冲附近10 ps的时间窗口内，基座强度处于约10的水平。在质子加速实验中，用聚焦强度约为1.4×10/的高对比度脉冲辐照了一个10 nm厚的CH靶，产生了截止能量为16 MeV的质子束。
