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Based on the Richards-Wolf vector diffraction integration, we obtained the expressions of the intensity and velocity of femtosecond radially polarized pulses at the focus near a dielectric interface, and the pulses are modulated by an optical system consisting of diffractive optical elements (DOEs) and a high numerical aperture (NA) lens. The factors that affected the intensity distribution and velocity evolution of the three-dimensional optical capture structural pulse (optical chain) are also analyzed. These factors include the DOE st