Abstract
Publisher Summary This chapter discusses the photon interference experiments utilizing photoelectronic devices. The quantum theory affords no criterion for low or high intensity, as the interference pattern should be independent of the intensity. If the intensity is below that for which the successive wave packets do not overlap in space then the intensity can be considered low. Another criterion for the upper limit of low intensity can be developed from the requirement that only one photon is in the apparatus at a time. Low intensity beams can be obtained by inserting filters between the source and the interference apparatus, without regard for the intensity of excitation within the source; or alternatively, provision may be made to run the source at a low level of excitation. The effects of the various neutral density filters on the nearly monochromatic light beam used were measured by means of a photomultiplier with the same nominal cathode spectral response as that of the image intensifier. Beam intensities were determined at various positions in the apparatus by means of a calibrated photomultiplier and confirmed at low beam intensities by direct spot counting on the film, making use of the image tube parameters.
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