Fig. 1: Schematic of the SU(1,1) interferometer for FTIR with undetected photons. | Communications Physics

Fig. 1: Schematic of the SU(1,1) interferometer for FTIR with undetected photons.

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

Fig. 1

HWP half-wave plate, DM dichroic mirror, M mirror, LPFs long-pass filters, PD photodetector. Either ppKTP or apKTP is used as the nonlinear crystal for the interferometer. The inset shows a signal interferogram generated by the ppKTP crystal without any sample, which is measured with the Si power meter and recorded with the software for the console (PM100D, Thorlabs).

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