The investigation of the features of focusing vortex super-Gaussian beams with a variable-height diffractive axicon

Spatial intensity distributions of the Laguerre-superGauss modes (1,0) as well a super-Gaussian beam with radial and circular polarization were investigated versus changes in height diffractive axicon. The relief optical element varied from 0.25λ to 3λ. modeling by finite-difference time-domain method showed that variations axicon significantly affect diffraction pattern near field smallest focal spot size for was obtained at equal two wavelengths. minimum mode "–" an quarter wavelength.