Ultra-broadband pulse generation via hollow-core fiber compression and frequency doubling for ultra-intense lasers

作者：Yanyan Li, Beijie Shao, Yujie Peng, Junyu Qian, Wenkai Li, Xinliang Wang, Xingyan Liu, Xiaoming Lu, Yi Xu, Yuxin Leng, Ruxin Li · 发表于：High Power Laser Science and Engineering · 年份：2023 · DOI：10.1017/hpl.2022.44 · 被引用次数：10 · 研究领域：Laser-Matter Interactions and Applications、Advanced Fiber Laser Technologies、Photonic Crystal and Fiber Optics

Abstract We demonstrate an ultra-broadband high temporal contrast infrared laser source based on cascaded optical parametric amplification, hollow-core fiber (HCF) and second harmonic generation processes. In this setup, the spectrum of an approximately 1.8 μm laser pulse has near 1 μm full bandwidth by employing an argon gas-filled HCF. Subsequently, after frequency doubling with cascaded crystals and dispersion compensation by a fused silica wedge pair, 9.6 fs (~3 cycles) and 150 μJ pulses centered at 910 nm with full bandwidth of over 300 nm can be generated. The energy stability of the output laser pulse is excellent with 0.8% (root mean square) over 20 min, and the temporal contrast is >10 12 at –10 ps before the main pulse. The excellent temporal and spatial characteristics and stability make this laser able to be used as a good seed source for ultra-intense and ultrafast laser systems.