1. State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China
Abstract We numerically study the self-compression of the optical pulses centered at 1.8-μm in a hollow-core fiber (HCF) filled with argon. It is found that the pulse can be self-compressed to 2 optical cycles when the input pulse energy is 0.2-mJ and the gas pressure is 500-mbar (1 bar=105 Pa). Inducing a proper positive chirp into the input pulse can lead to a shorter temporal duration after self-compression. These results will benefit the generation of energetic few-cycle mid-infrared pulses.
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61475169, 61521093, and 11127901), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB16), and the International Science and Technology Cooperation Program of China (Grant No. 2016YFE0119300).
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