P. Hariharan et al., INTERFERENCE IN THE SINGLE-PHOTON REGIME BEATS WITH 2 ORTHOGONALLY POLARIZED LASER MODES, J. mod. opt., 40(8), 1993, pp. 1573-1580
The two orthogonally polarized modes of a Zeeman laser can be combined
at a polarizing beam-splitter to produce two outputs at the differenc
e frequency. This paper presents some observations on these beats in t
he classical limit and in the single photon regime, where the mean sep
aration of the photons exceeds the optical path length, and discusses
their implications.