2 research outputs found
Absolute Quantum Efficiency Measurements by Means of Conditioned Polarization Rotation
We propose a new scheme for measuring the quantum efficiency of photon
counting detectors by using correlated pho-tons. The measurement technique is
based on a 90 rotation of the polarization of one photon member of a correlated
pair produced by parametric down-conversion, conditioned on the detection of
the other correlated photon after polarization selection. We present
experimental results obtained with this scheme
Analysis of the possibility of analog detectors calibration by exploiting Stimulated Parametric Down Conversion
Spontaneous parametric down conversion (SPDC) has been largely exploited as a
tool for absolute calibration of photon-counting detectors, i.e detectors
registering very small photon fluxes. In [J. Opt. Soc. Am. B 23, 2185 (2006)]
we derived a method for absolute calibration of analog detectors using SPDC
emission at higher photon fluxes, where the beam is seen as a continuum by the
detector. Nevertheless intrinsic limitations appear when high-gain regime of
SPDC is required to reach even larger photon fluxes. Here we show that
stimulated parametric down conversion allow one to avoid this limitation, since
stimulated photon fluxes are increased by the presence of the seed beam.Comment: 9 pages, 1 figur