Fig. 5
From: Self-induced transparency in a perfectly absorbing chiral second-harmonic generator
Chiral second harmonic generation through coherent control. Three typical phase-controllable SHG with different input power ratios between right and left ports are shown in (a) to (c), with their corresponding fundamental waves’ output from the two ports (d) to (f). All of the results are measured at the zero-detuning point (\(\small {\varDelta }_{1}=0\)). The perfect annihilation of left SHG occurs in (b), when the two fundamental wave inputs are in-phase (e). Such distinction ratio of SHG outputs from both ports are plotted against the fundamental wave input ratio between the right and left in (g), which shows an optimal point with a maximal distinction ratio of ~ 153 at \(\small {\text{P}}_{\text{r}\text{i}\text{g}\text{h}\text{t}}/{\text{P}}_{\text{l}\text{e}\text{f}\text{t}}= 0.45\). The power of the left-input beam is fixed at 1mW while varying the right one to change the input power ratio