Spatial characteristics of nonlinear Thomson scattering from tightly focused single-cycle laser pulse with varied initial phases

Yiqiu Wang; Jiawei Zhuang; Qinyan Zhou; Yunfeng Cai; Youwei Tian

doi:10.1117/12.2600757

31 August 2021 Spatial characteristics of nonlinear Thomson scattering from tightly focused single-cycle laser pulse with varied initial phases

Yiqiu Wang, Jiawei Zhuang, Qinyan Zhou, Yunfeng Cai, Youwei Tian

Author Affiliations +

Proceedings Volume 11907, Sixteenth National Conference on Laser Technology and Optoelectronics; 1190702 (2021) https://doi.org/10.1117/12.2600757
Event: Sixteenth National Conference on Laser Technology and Optoelectronics, 2021, Shanghai, China

Abstract

Nonlinear Thomson scattering in intense (𝑎₀ = 6) single-cycle (𝐿₀= 1𝜇𝑚) Gaussian laser pulse is investigated theoretically and numerically that demonstrates varied spatial characteristics in the tightly focused (𝑏₀ = 3𝜇𝑚) regime. In the above ultrashort laser pulse, the electron has the potential to radiate single attosecond pulse with almost infinite SNR which is highly robust to varied initial phases. Furthermore, a novel symmetry degradation phenomenon in the tightly focused domain is firstly discovered, where the fourfold symmetric spatial radiation pattern in non-tightly focused pulses respectively degrades to plane/linear symmetry radiation pattern in the spherical projected/polarized plane. While spatial radiation is highly sensitive to initial phases, we remarkably find that the difference of peak radiation’s polar angles 𝜙_m exactly equals to that of incident laser’s initial phases 𝜙₀, indicating the initial phase has phase/angle shift effect on the electron’s spatial motion and radiation. With numerical analysis, the sampling results demonstrate that peak radiation’s polar angle 𝜃_m and the difference 𝜙_m = 𝜙₀ are constant regardless of initial phases.

Citation Download Citation

Yiqiu Wang, Jiawei Zhuang, Qinyan Zhou, Yunfeng Cai, and Youwei Tian "Spatial characteristics of nonlinear Thomson scattering from tightly focused single-cycle laser pulse with varied initial phases", Proc. SPIE 11907, Sixteenth National Conference on Laser Technology and Optoelectronics, 1190702 (31 August 2021); https://doi.org/10.1117/12.2600757

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