The phenomenon of collinear correlated photon pair diffraction by an ultrasonic wave is investigated for Bragg incidence. A beta-barium borate crystal was used for producing collinear correlated photon pairs via type-I spontaneous parametric down-conversion. It is shown experimentally that the Bragg angle for photon pair diffraction is identical to the one corresponding to single-photon diffraction. The numbers of single photon and photon pair counts in discrete diffraction orders were measured as functions of the Raman-Nath parameter. Similarly, the number of coincidence photon counts in separate diffraction orders was also investigated. What is more, simple analytical formulas are derived which perfectly agree with the experimentally obtained data.
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