Helicity of harmonic generation and attosecond polarization with bichromatic circularly polarized laser fields

Zhang Jun^{1, 2}, Qi Tong², Pan Xue-Fei², Guo Jing², Zhu Kai-Guang^{1, †}, Liu Xue-Shen^2,

(a) Spectral chirality χ = I LCP − I RCP I LCP + I RCP as a function of the intensity ratio γ E in BCCP laser fields with the same total intensities E 0 = 0.05 a.u. and 0.1 a.u. Lissajous diagrams of BCCP laser fields with different intensity ratios: (b) γ E = 1 / 2 , (c) γ E = 2 / 3 , (d) γ E = 1.0 , (e) γ E = 2.0 , (f) γ E = 8.0 , (g) γ E = 10.0 .