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

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 empl...

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Bibliographic Details
Published in:High power laser science and engineering 2023-01, Vol.11, Article e5
Main Authors: Li, Yanyan, Shao, Beijie, Peng, Yujie, Qian, Junyu, Li, Wenkai, Wang, Xinliang, Liu, Xingyan, Lu, Xiaoming, Xu, Yi, Leng, Yuxin, Li, Ruxin
Format: Article
Language:English
Subjects:
Argon
Bandwidths
Broadband
Crystals
Efficiency
Energy
Fused silica
Infrared lasers
Lasers
Power
Second harmonic generation
Spectrum allocation
Stability
Ultrafast lasers
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Summary: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 >1012 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.
ISSN:2095-4719
2052-3289
DOI:10.1017/hpl.2022.44