title: Spectral line-shape measurement of an extremely weak amplitude-fluctuating light source by photon-counting-based second-order correlation spectroscopy.
abstract: We demonstrate line-shape measurement of an extremely weak amplitude-fluctuating light source by using photon-counting-based second-order correlation spectroscopy combined with the heterodyne technique. The amplitude fluctuation of a finite bandwidth introduces a low-lying spectral structure in the line shape, and thus its effect can be isolated from that of the phase fluctuation. Our technique provides extreme sensitivity suited for single-atom-level applications.
authors.affiliation: Department of Physics and Astronomy, Seoul National University, Seoul, South Korea.
authors.forename: Hyun-Gue
authors.initials: HG
authors.lastname: Hong
authors.forename: Wontaek
authors.initials: W
authors.lastname: Seo
authors.forename: Moonjoo
authors.initials: M
authors.lastname: Lee
authors.forename: Wonshik
authors.initials: W
authors.lastname: Choi
authors.forename: Jai-Hyung
authors.initials: JH
authors.lastname: Lee
authors.forename: Kyungwon
authors.initials: K
authors.lastname: An