A simple optical superposition experiment is analyzed in detail and a comparison is made between the photoelectric signal modulation which is characteristic of interference and the Alford and Gold effect. Some significant differences are pointed out. It is shown that the Alford and Gold effect is of the first order in the degeneracy parameter and of the second order in the degree of coherence, so that it resembles the intensity correlation effect discovered by Hanbury Brown and Twiss.
© 1962 Optical Society of America
L. MANDEL, "Interference and the Alford and Gold Effect," J. Opt. Soc. Am. 52, 1335-1339 (1962)