| Cite this article as: Zhang Jun,Liu Xiao-Yan,Liu Xue-Shen. Control of ellipticity in molecular high-order harmonic generation in a linearly polarized two-color laser field [J]. J. At. Mol. Phys.(原子与分子物理学报), 2023, 40: 015001 (in Chinese) |
| Control of ellipticity in molecular high-order harmonic generation in a linearly polarized two-color laser field |
| Hits 633 Download times 149 Received:December 20, 2021 Revised:January 07, 2022 |
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| Key Words
high-order harmonic generation time-dependent schrodinger equation polarization property attosecond pulse generation |
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| Abstract
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| The control of elliptically polarized harmonic provides an effective route t for probing and manipulating the ultrafast magnetic and chiral dynamics. We theoretically investigate the high-order harmonic generation (HHG) and attosecond pulse of H2+ and H32+ molecules driven by linearly polarized laser pulses. When the orientation degree is zero, the harmonic ellipticity of H2+ molecules is almost zero. While for H32+ molecules, the harmonic ellipticity is larger, which is determined by the symmetry of molecular orbitals. We find that the harmonic intensity and harmonic ellipticity can be controlled by changing the orientation degree, which provides a means to generate large elliptical XUV pulses. The harmonic order with higher ellipticity corresponds to the order with lower harmonic intensity. The analysis shows that the two-center interference effect of molecules has a great influence on the ellipticity. For H2+ and H32+ molecules, elliptically polarized attosecond pulses with ellipticity of 0.75 and 0.55 are synthesized, respectively. The generation of large elliptical XUV pulses provides important applications of high order harmonic spectrum in materials and biological sciences. |
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