Generating attosecond pulses with controllable polarization from cyclic H32+ molecules by bichromatic circular fields
Si-Qi Zhang(张思琪)1, Bing Zhang(张冰)1,†, Bo Yan(闫博)1, Xiang-Qian Jiang(姜向前)1,‡, and Xiu-Dong Sun(孙秀冬)1,2
1 School of Physics, Harbin Institute of Technology, Harbin 150001, China; 2 Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
Abstract We investigate the polarization properties of harmonics from the cyclic H32+ molecular ions in tailored bichromatic counter-rotating circularly polarized (BCCP) fields by solving the time-dependent Schrödinger equation. The allowed harmonics and their helicities are associated with the symmetry compatibility of the field-target systems, and large intensity difference between adjacent harmonics with opposite helicities appears in a wide spectral range when the BCCP field is at certain rotation angles. We try to explain the intensity difference by using a recombination model based on the quantum-orbit theory and by analyzing the ionization pathways. Moreover, to synthesize attosecond pulse trains with tunable polarization, the intensity difference is manipulated by introducing a seed XUV field, and by changing the relative amplitude ratio as well as the helicity of BCCP fields.
(Ultrafast processes; optical pulse generation and pulse compression)
Fund: This work was supported by the National Natural Science Foundation of China (Grant No. 91950117) and the Fundamental Research Funds for the Central Universities.
Si-Qi Zhang(张思琪), Bing Zhang(张冰), Bo Yan(闫博), Xiang-Qian Jiang(姜向前), and Xiu-Dong Sun(孙秀冬) Generating attosecond pulses with controllable polarization from cyclic H32+ molecules by bichromatic circular fields 2024 Chin. Phys. B 33 023301
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