Generating attosecond pulses with high ellipticity by use of He atoms. Issue 14 (16th August 2019)

• Record Type: Journal Article
• Authors: Zhu, Mu-Feng; Wang, Guo-Li; Zhao, Song-Feng; Li, Xiao-Yong; Zhou, Xiao-Xin
• Is Part Of: Journal of modern optics. Volume 66:Issue 14(2019)
• Page Start: 1467
• Page End: 1475
• Publication Date: 2019-08-16
• Subjects: High-order harmonics -- attosecond pulse trains -- polarization -- circular-elliptical laser field; Optics -- Periodicals; 535
• DOI: 10.1080/09500340.2019.1632949
• Languages: English
• ISSNs: 0950-0340

Abstract

ABSTRACT: To control the polarization of attosecond pulse trains (APTs), the most widely used way is to adjust the intensity ratio between the two components in a bicircular laser field. Here we demonstrate another effective means to obtain highly elliptically polarized APTs. For this purpose, we propose a circular-elliptical laser field, which consists of a circularly polarized field with its coplanar counter-rotating elliptical harmonic pulse, in order to generate high-order harmonics by He atom. We show that the polarization of APTs depends evidently on the ellipticity ξ of harmonic laser field. Most importantly, nearly circular APTs can be obtained with a proper ξ for ω − 3 ω driving laser field. Our results contribute to the generation of high elliptically polarized APTs with s -state atom.