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APDs as Single-Photon Detectors for Visible and Near-Infrared Wavelenghts down to Hz Rates | | R. Jöhren
; R. Berendes
; W. Buglak
; D. Hampf
; V. Hannen
; J. Mader
; W. Nörtershäuser
; R. Sánchez
; C. Weinheimer
; | | Date: |
29 Nov 2011 | | Abstract: | For the SPECTRAP experiment at GSI, Germany, detectors with Single-Photon
counting capability in the visible and near-infrared regime are required. For
the wavelength region up to 1100 nm we investigate the performance of 2x2 mm^2
avalanche photo diodes (APDs) of type S0223 manufactured by Radiation
Monitoring Devices. To minimize thermal noise, the APDs are cooled to
approximately -170 deg. C using liquid nitrogen. By operating the diodes close
to the breakdown voltage it is possible to achieve gains in excess of 2x10^4.
Extremly low noise preamplifiers are used to read out the devices. The
measurements presented in this paper have been obtained at a gain of 22,000. At
a discriminator threshold of 6 mV the resulting dark count rate is in the
region of 200/s. With these settings the studied APDs are able to detect single
photons at 628 nm wavelength with a photodetection efficiency of (67+-7)%.
Measurements at 1020 nm wavelength have been performed using the attenuated
output of a grating spectrograph with a light bulb as photon source. With this
setup the photodetection efficiency at 1020 nm has been determined to be
(13+-3)%, again at a threshold of 6 mV. | | Source: | arXiv, 1111.6948 | | Services: | Forum | Review | PDF | Favorites | |
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