Figure 4

Experimental observation of the effect. Rabi in-phase experiment (a–e), i.e., the Rabi oscillations from the two different pulses start with the same phase, and Rabi antiphase experiment (f–j), i.e., the Rabi oscillations start with an opposite phase. The experimental data (a–c, f–h, black dots) is fitted by the theoretical model (solid lines), providing the amplitudes and degrees of polarizations S_p. The dynamics of polarization can be displayed on the Poincaré sphere (d, i), demonstrating the rapid transition to the linear polarization in (d) and the spanning of the full hemisphere polarization in (i). (e, j) 2D + t representation of the polarization flow over a 10 ps time span: the surface represents the envelope of the electric field and the color (from red to blue) is scaled on the instantaneous field amplitude. Fitting parameters: g = 4.02 ps⁻¹, γ_a = 0.2 ps⁻¹, γ_U = 0.43 ps⁻¹, , σ = 1/0.15 ps⁻¹. (a–e) Δτ = 1.55 ps, (f–j) Δτ = 1.13 ps.