Ultraviolet supercontinuum generation driven by ionic coherence in a strong laser field

• Published in: Nature communications Vol. 13; no. 1; pp. 4080 - 9
• Main Authors: Lei, Hongbin, Yao, Jinping, Zhao, Jing, Xie, Hongqiang, Zhang, Fangbo, Zhang, He, Zhang, Ning, Li, Guihua, Zhang, Qian, Wang, Xiaowei, Yang, Yan, Yuan, Luqi, Cheng, Ya, Zhao, Zengxiu
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 14.07.2022; Nature Publishing Group; Nature Portfolio
• Subjects: 119/118; 140/125; 639/766/36/1121; 639/766/36/2796; 639/766/400/1119; Absorption spectroscopy; Broadband; Coherence; Continuum radiation; Field ionization; Humanities and Social Sciences; Ionization; Ions; Lasers; Light sources; multidisciplinary; Nitrogen ions; Optics; Quantum optics; Radiation; Resonance; Science; Science (multidisciplinary)
• ISSN: 2041-1723; 2041-1723
• DOI: 10.1038/s41467-022-31824-0

Supercontinuum (SC) light sources hold versatile applications in many fields ranging from imaging microscopic structural dynamics to achieving frequency comb metrology. Although such broadband light sources are readily accessible in the visible and near infrared regime, the ultraviolet (UV) extension of SC spectrum is still challenging. Here, we demonstrate that the joint contribution of strong field ionization and quantum resonance leads to the unexpected UV continuum radiation spanning the 100 nm bandwidth in molecular nitrogen ions. Quantum coherences in a bunch of ionic levels are found to be created by dynamic Stark-assisted multiphoton resonances following tunneling ionization. We show that the dynamical evolution of the coherence-enhanced polarization wave gives rise to laser-assisted continuum emission inside the laser field and free-induction decay after the laser field, which jointly contribute to the SC generation together with fifth harmonics. As proof of principle, we also show the application of the SC radiation in the absorption spectroscopy. This work offers an alternative scheme for constructing exotic SC sources, and opens up the territory of ionic quantum optics in the strong-field regime. Supercontinuum generation can be utilized for light source development. Here the authors demonstrate ultraviolet supercontinuum generation from ions due to strong field ionization and multiphoton resonance effect.