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Near-circularly polarized isolated attosecond pulse generation from coherent superposition state by a circularly polarized laser field

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Abstract

We theoretically investigate high-order harmonic generation (HHG) from a coherent superposition state of hydrogen atom in a circularly polarized (CP) laser field. The results show that, driven by the CP field, HHG from the coherent superposition state is enhanced by 4 to 5 orders of magnitude compared to that from the ground state. The enhanced intensity is comparable to that of the ground state in a linearly polarized laser field. Based on the classical and quantum analyses, we demonstrate that HHG in the CP laser field mainly arises from the recombination of electrons ionized at non-zero initial positions. The enhancement of HHG from the coherent superposition state is due to the higher ionization rate and also the larger probability density of electrons located far from the nucleus of the involved excited state. The obtained harmonic spectra support the generation of intense isolated attosecond pulses (IAPs) with the ellipticity as high as 0.93. Moreover, we show that the generation of IAPs with large ellipticity is robust against the variation of the carrier envelope phase (CEP) of the laser field. Our results provide a new route toward generating near-CP IAPs, which will be beneficial for ultrafast detection of chiral-sensitive light-matter interactions.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China under Grants No. 11627809, No. 11874165, No. 11704137 and No. 11774109; Fundamental Research Funds for the Central Universities (2017KFXKJC002); Program for HUST Academic Frontier Youth Team. Numerical simulations presented in this paper were carried out using the High Performance Computing experimental testbed in SCTS/CGCL.

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Yuan, H., Wang, F., Zhang, Y. et al. Near-circularly polarized isolated attosecond pulse generation from coherent superposition state by a circularly polarized laser field. Opt Quant Electron 51, 177 (2019). https://doi.org/10.1007/s11082-019-1888-7

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