1.
Absolute calibration of photodetectors: photocurrent multiplication versus photocurrent subtraction.
Opt Lett
; 36(8): 1329-31, 2011 Apr 15.
Article
in English
| MEDLINE
| ID: mdl-21499346
ABSTRACT
We report testing of the new absolute method of photodetector calibration based on the difference-signal measurement for two-mode squeezed vacuum by comparison with the traditional absolute method based on coincidence counting. Using low-gain parametric downconversion, we have measured the quantum efficiency of a counting detector by both methods. The difference-signal method was adapted for the counting detectors by taking into account the dead-time effect.