Title: Two-photon superbunching of pseudothermal light in a Hanbury Brown-Twiss interferometer,
Abstract: Two-photon superbunching of pseudothermal light is observed with single-mode
continuous-wave laser light in a linear optical system. By adding more
two-photon paths via three rotating ground glasses,g(2)(0) = 7.10 is
experimentally observed. The second-order temporal coherence function of
superbunching pseudothermal light is theoretically and experimentally studied
in detail. It is predicted that the degree of coherence of light can be
increased dramatically by adding more multi-photon paths. For instance, the
degree of the second- and third-order coherence of the superbunching
pseudothermal light with five rotating ground glasses can reach 32 and 7776,
respectively. The results are helpful to understand the physics of
superbunching and to improve the visibility of thermal light ghost imaging.