title: Optimization of two-photon wave function in parametric down conversion by adaptive optics control of the pump radiation.
abstract: We present an efficient method for optimizing the spatial profile of entangled-photon wave function produced in a spontaneous parametric down conversion process. A deformable mirror that modifies a wavefront of a 404 nm CW diode laser pump interacting with a nonlinear β-barium borate type-I crystal effectively controls the profile of the joint biphoton function. The use of a feedback signal extracted from the biphoton coincidence rate is used to achieve the optimal wavefront shape. The optimization of the two-photon coupling into two, single spatial modes for correlated detection is used for a practical demonstration of this physical principle.
authors: Department of Information Engineering, University of Padova, Padova 35131, Italy.
authors: M
authors: M
authors: Minozzi
authors: S
authors: S
authors: Bonora
authors: A V
authors: AV
authors: Sergienko
authors: G
authors: G
authors: Vallone
authors: P
authors: P
authors: Villoresi