Semi-integer harmonic generation from an argon atom by bichromatic counter-rotating circularly polarized laser field
HHG spectrum by the BCCP laser field with the right-circularly polarized laser wavelength 800 nm and different frequency ratios of the right- and left-circularly polarized laser pulse. (a) ω2 = 1.5ω1, (λ2 = 533 nm); (b) ω2 = 2.5ω1, (λ2 = 320 nm); (c) ω2 = 3.5ω1, (λ2 = 228 nm); (d) ω2 = 4.5ω1, (λ2 = 177 nm).
