title: Design of intense 1.5-cycle pulses generation at 3.6 µm through a pressure gradient hollow-core fiber.
abstract: We theoretically study the nonlinear compression of the 10-mJ, 62-fs, 3.6-µm laser pulses in an argon gas-filled hollow-core fiber with large diameter of 1000 µm. Using a pressure gradient to restrict undesirable nonlinear effect such as ionization, especially at the entrance, we obtain the intense 18.3-fs (~1.5 cycle) pulses at 3.6 µm only through compression with CaF2crystal, which can be used as an ultrafast source for strong field driven experiments. In addition, we calculate and discuss the relation between optimal fiber length and coupling efficiency for a given bandwidth. These results are useful for the design of using hollow-core fiber to compress the high-energy pulses with long wavelength.
authors.forename: Zhiyuan
authors.initials: Z
authors.lastname: Huang
authors.forename: Ding
authors.initials: D
authors.lastname: Wang
authors.forename: Ye
authors.initials: Y
authors.lastname: Dai
authors.forename: Yanyan
authors.initials: Y
authors.lastname: Li
authors.forename: Xiaoyang
authors.initials: X
authors.lastname: Guo
authors.forename: Wenkai
authors.initials: W
authors.lastname: Li
authors.forename: Yun
authors.initials: Y
authors.lastname: Chen
authors.forename: Jun
authors.initials: J
authors.lastname: Lu
authors.forename: Zhengzheng
authors.initials: Z
authors.lastname: Liu
authors.forename: Ruirui
authors.initials: R
authors.lastname: Zhao
authors.forename: Yuxin
authors.initials: Y
authors.lastname: Leng