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The aim of this review is to provide a unitary and extensive theory of parametric down conversion beyond the limit of low gain and single mode regime, addressing the problem of measuring the twin beams and the intensity correlations by means of analog detectors. An important example
of application can be found in optical metrology: the absolute calibration of analog photo-detectors.
ADVANCED SCIENCE LETTERS is an international peer-reviewed journal with a very wide-ranging coverage, consolidates research activities in all areas of (1) Physical Sciences, (2) Biological Sciences, (3) Mathematical Sciences, (4) Engineering, (5) Computer and Information Sciences, and (6) Geosciences to publish original short communications, full research papers and timely brief (mini) reviews with authors photo and biography encompassing the basic and applied research and current developments in educational aspects of these scientific areas.