Efficient soft x-ray high-order harmonic generation via dual-pulse driving lasers in the overdriven regime. (20th April 2021)

• Record Type: Journal Article
• Authors: Shao, Renzhi; Zhai, Chunyang; Zhang, Yinfu; He, Lixin; Zhu, Xiaosong; Lan, Pengfei; Lu, Peixiang
• Is Part Of: Journal of physics. Volume 54:Number 6(2021)
• Publication Date: 2021-04-20
• Subjects: high-order harmonic generation -- soft x-ray -- overdriven regime -- plasma effect; Atoms -- Periodicals; Molecules -- Periodicals; Optics -- Periodicals; Nuclear physics -- Periodicals; 539.6
• DOI: 10.1088/1361-6455/abf297
• Languages: English
• ISSNs: 0953-4075

Abstract

Abstract: We theoretically investigate the high-order harmonic generation (HHG) driven by dual-pulse lasers. The first pulse of 800 nm can create plasma in the high-density gas target. Then, the second pulse of 1800 nm is spatiotemporally reshaped by the plasma and generates soft x-ray high-order harmonics in the overdriven regime. The simulation results show that adding the first pulse can promote the phase matching of HHG in the cutoff region. As a result, a cutoff-extended HHG is achieved, which is one order of magnitude more intense than that in one pulse scheme reported previously. In dual-pulse driving lasers, the harmonic yield and the cutoff photon energy can be optimized effectively by increasing the gas pressure inside the water window region.