Ultrafast direct measurement of HBT effect by two-photon absorption based on Feynman's path-integral theory

Abstract

Hanbury Brown and Twiss effect of thermal light is directly observed in a modified Michelson interferometer with a two-photon absorption detector at the ultrafast timescale. The contribution of other items in signal of two-photon absorption detector are analyzed in detail by employing Feynman's path-integral theory.