Abstract

A level-crossing detection method is presented and developed based on measurement of the normalized second factorial moment n(2)(T) of the photon-counting distribution of the resultant fluorescence. Expression n(2)(T) is obtained, and the errors expected in the determination of signal width and crossing field are theoretically studied. The validity of the approximations performed to establish the theoretical model is proved by an experiment with a square-wave periodically modulated light beam.

© 1980 Optical Society of America

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