Fig. 3. Deterministic full-reversal strategy.

a Protocol of the three-pulse reversal process; the yellow background boxes are for the initial and excited polarization phases and the pink background boxes are used to indicate the laser pulses that are along x, y, and z axes; The labels of the phases $\tilde{\mathbf{P}}$ is defined as P + Q to indicate the total polarization. The blue arrows are used to indicate the phase transition channels after the laser pulses. Responses of the Q (b) and P modes (c) excited by a sequence of three “200fs-18THz” pulses activated at 10, 20, and 30 ps and having their polarized direction along [100], [010], and [011] directions, respectively. For each of these pulses, the magnitude of E in $\mathbf{E}{e}^{-2\mathrm{ln2}{\left(\frac{t}{\tau }\right)}^2}\cos \left(2\pi \omega t\right)$ is 6.17 MV/cm.