Fig. 3: Visibility evaluation. | Communications Physics

Fig. 3: Visibility evaluation.

From: Fourier-transform infrared spectroscopy with undetected photons from high-gain spontaneous parametric down-conversion

Fig. 3

a A signal interferogram measured at an idler amplitude transmittance \(\left|{t}_{{{{{{\rm{i}}}}}}}\right|=0.39\) and a signal amplitude transmittance \(\left|{t}_{{{{{{\rm{s}}}}}}}\right|=0.80\). The visibility is 67%. b Simulated signal interferograms at \(\left|{t}_{{{{{{\rm{i}}}}}}}\right|=0.39\) and \(\left|{t}_{{{{{{\rm{s}}}}}}}\right|=0.80\) with a parametric gain of 11 (blue) and 0.1 (green). The visibilities at the high- and low-parametric-gain regimes are 79% and 38%, respectively. Each interferogram is normalized to the peak intensity. OPD optical path-length differences.

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