Propagation properties of vectorial Hermite—cosine—Gaussian beams beyond the paraxial approximation

摘要

Starting from the vectorial Rayleigh-Sommerfeld diffraction integrals, the analytical propagation expressions of vectorial nonparaxial Hermite-cosine-Gaussian (HCosG) beams in free space are derived. The on-axis intensity, far-field equation and, in particular, paraxial expressions are given and treated as special cases of our result. It is shown that for vectorial nonparaxial HCosG beams, the parameter f=1/kwo, with k being the wave number and wo being the waist width, determines their nonparaxiality. What is more, the decentered parameter also affects their intensity distribution and nonparaxial behavior. The calculation results indicate that the position of maximum on-axis intensity changes with the mode indices.