Generation of circularly polarized XUV and soft-x-ray high-order harmonics by homonuclear and heteronuclear diatomic molecules subject to bichromatic counter-rotating circularly polarized intense laser fields

Heslar, John; Telnov, Dmitry A.; Chu, Shih-I

doi:10.1103/physreva.96.063404

Title: Generation of circularly polarized XUV and soft-x-ray high-order harmonics by homonuclear and heteronuclear diatomic molecules subject to bichromatic counter-rotating circularly polarized intense laser fields

Journal Article · Tue Dec 05 00:00:00 EST 2017 · Physical Review A

DOI:https://doi.org/10.1103/physreva.96.063404· OSTI ID:1540670

Heslar, John ^[1]; Telnov, Dmitry A. ^[2]; Chu, Shih-I ^[3]

National Taiwan Univ., Taipei (Taiwan). Center for Quantum Science and Engineering, Center for Advanced Study in Theoretical Sciences
St. Petersburg State Univ. (Russia)
National Taiwan Univ., Taipei (Taiwan). Center for Quantum Science and Engineering, Center for Advanced Study in Theoretical Sciences; Univ. of Kansas, Lawrence, KS (United States)

Recently, studies of bright circularly polarized high-harmonic beams from atoms in the soft-x-ray region as a source for x-ray magnetic circular dichroism measurement in a tabletop-scale setup have received considerable attention. In this paper, we address the problem with molecular targets and perform a detailed quantum study of H₂+, CO, and N₂ molecules in bichromatic counter-rotating circularly polarized laser fields where we adopt wavelengths (1300 and 790 nm) and intensities (2 × 10¹⁴ W/cm²) reported in a recent experiment [Proc. Natl. Acad. Sci. USA 112, 14206 (2015)]. Our treatment of multiphoton processes in homonuclear and heteronuclear diatomic molecules is nonperturbative and based on the time-dependent density-functional theory for multielectron systems. The calculated radiation spectrum contains doublets of left and right circularly polarized harmonics with high-energy photons in the XUV and soft-x-ray ranges. Overall, our results reveal intriguing and substantially different nonlinear optical responses for homonuclear and heteronuclear diatomic molecules subject to circularly polarized intense laser fields. We study in detail the below- and above-threshold harmonic regions and analyze the ellipticity and phase of the generated harmonic peaks.

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Research Organization:: Univ. of Kansas, Lawrence, KS (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; Ministry of Science and Technology of Taiwan; Russian Foundation for Basic Research; USDOE

Grant/Contract Number:: FG02-04ER15504; 106R104021; 106R8700-2; 16-02-00233

OSTI ID:: 1540670

Alternate ID(s):: OSTI ID: 1411277

Journal Information:: Physical Review A, Vol. 96, Issue 6; ISSN 2469-9926

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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Odd–even harmonic generation from oriented CO molecules in linearly polarized laser fields and the influence of the dynamic core-electron polarization Phan, Ngoc-Loan; Le, Cam-Tu; Hoang, Van-Hung Physical Chemistry Chemical Physics, Vol. 21, Issue 43 https://doi.org/10.1039/c9cp04064a	journal	January 2019
Quantum-orbit analysis of high-order harmonic generation by bicircular field Milošević, D. B. Journal of Modern Optics, Vol. 66, Issue 1 https://doi.org/10.1080/09500340.2018.1511862	journal	August 2018

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Title: Generation of circularly polarized XUV and soft-x-ray high-order harmonics by homonuclear and heteronuclear diatomic molecules subject to bichromatic counter-rotating circularly polarized intense laser fields

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