Theoretical study on spatial property of parametric fluorescence in a type ⅠBBO crystal

Using the amplification transfer function of type ⅠBBO crystal, the theoretical study of spatial properties of the optical parametric fluorescence generated by homochromatic signal and polychromatic signal in optical parametric amplification is investigated. The numerical simulation results demonstrate that when the homochromatic signal is injected into optical parametric amplifier, the fluorescence signal is first emitted in a cone and then in a ring while centering on the pump wave direction. For the amplification of the polychromatic signal pulse, the spectrum of the fluorescence is over a wide wavelength range under a special phase matching angle. The result provides a theoretical reference for controlling the generation of the optical parametric fluorescence and quantum entanglement