Measurement of the detection efficiency of single-photon counters based on avalanche photodiodes using the spontaneous parametric down-conversion method with spectrally asymmetric channels

The frequency-diaphragm technique of standardless measurement of the photon detection efficiency simultaneously of two single-photon detectors is considered. The technique is based on the well-known каmeasurement of the detection efficiency using photon pairs generated in a nonlinear crystal during spontaneous parametric scattering. A specific feature of the considered technique is the use of spectrally asymmetric channels. An experimental setup that implements the technique in the degenerate mode of spontaneous parametric scattering is described. The results of the simultaneous measurement of the detection efficiency of two single-photon detectors at a wavelength of 810 nm are presented. The detectors are made on the basis of silicon avalanche photodiodes SAP-500 with fiber inputs. It is shown that the considered technique can also be used to measure the detection efficiency of single-photon detectors sensitive in the longer wavelength region of the spectrum. . The proposed method, compared with a purely diaphragm scheme, has the advantage in simplicity and reliability of alignment.

счётчики одиночных фотонов, спонтанное параметрическое рассеяние, квантовая эффективность, эффективность детектирования фотонов, single photon counters, spontaneous parametric scattering, quantum efficiency, photon detection efficiency

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