title: X-ray parametric down-conversion in the Langevin regime.
abstract: We experimentally and theoretically study the coincidence count rate for down-converted x-ray photons. Because of photoionization, parametric down-conversion at x-ray wavelengths generally involves loss and the theoretical description requires a Langevin approach. By working in a transmission geometry (Laue) rather than in the Bragg geometry of previous experiments, we obtain an improvement in the signal-to-noise ratio of 12.5, and find agreement between experiment and theory.
authors.affiliation: Edward L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA. shwartz@stanford.edu
authors.forename: S
authors.initials: S
authors.lastname: Shwartz
authors.forename: R N
authors.initials: RN
authors.lastname: Coffee
authors.forename: J M
authors.initials: JM
authors.lastname: Feldkamp
authors.forename: Y
authors.initials: Y
authors.lastname: Feng
authors.forename: J B
authors.initials: JB
authors.lastname: Hastings
authors.forename: G Y
authors.initials: GY
authors.lastname: Yin
authors.forename: S E
authors.initials: SE
authors.lastname: Harris