In this paper, we report the recent progress on the $1~\text{PW}/0.1~\text{Hz}$ laser beamline of Shanghai Superintense Ultrafast Laser Facility (SULF). The SULF-1 PW laser beamline is based on the double chirped pulse amplification (CPA) scheme, which can generate laser pulses of 50.8 J at 0.1 Hz after the final amplifier; the shot-to-shot energy fluctuation of the amplified pulse is as low as 1.2% (std). After compression, the pulse duration of 29.6 fs is achieved, which can support a maximal peak power of 1 PW. The contrast ratio at $-80~\text{ps}$ before main pulse is measured to be $2.5\times 10^{-11}$ . The focused peak intensity is improved by optimizing the angular dispersion in the grating compressor. The maximal focused peak intensity can reach $2.7\times 10^{19}~\text{W}/\text{cm}^{2}$ even with an $f/26.5$ off-axis parabolic mirror. The horizontal and vertical angular pointing fluctuations in 1 h are measured to be 1.89 and $2.45~\unicode[STIX]{x03BC}\text{rad}$ , respectively. The moderate repetition rate and the good stability are desirable characteristics for laser–matter interactions. The SULF-1 PW laser beamline is now in the phase of commissioning, and preliminary experiments of particle acceleration and secondary radiation under 300–400 TW/0.1 Hz laser condition have been implemented. The progress on the experiments and the daily stable operation of the laser demonstrate the availability of the SULF-1 PW beamline.

中文翻译：

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SULF 设施中的激光束线

在本文中，我们报告了最近的进展 $1~\text{PW}/0.1~\text{Hz}$ 上海超强超快激光设备（SULF）的激光束线。SULF-1 PW激光束线基于双啁啾脉冲放大（CPA）方案，经过末级放大器后可产生0.1 Hz的50.8 J激光脉冲；放大脉冲的脉冲能量波动低至 1.2% (std)。压缩后的脉冲持续时间为 29.6 fs，可支持 1 PW 的最大峰值功率。对比度在 $-80~\文本{ps}$ 在主脉冲被测量为 $2.5\乘以 10^{-11}$ . 通过优化光栅压缩器中的角度色散来提高聚焦峰强度。最大聚焦峰强度可达 $2.7\times 10^{19}~\text{W}/\text{cm}^{2}$ 即使有 $f/26.5$ 离轴抛物面镜。1 小时内水平和垂直角度指向波动测量为 1.89 和 $2.45~\unicode[STIX]{x03BC}\text{rad}$ ， 分别。适度的重复率和良好的稳定性是激光与物质相互作用的理想特性。SULF-1 PW 激光束线目前处于调试阶段，已进行了 300-400 TW/0.1 Hz 激光条件下的粒子加速和二次辐射的初步实验。实验的进展和激光器的日常稳定运行证明了 SULF-1 PW 光束线的可用性。