Vol. 53, Issue 3, pp. 467-481
angular spectrum, propagation of higher modes, annular aperture, near-and far fields
This research focuses on the analysis of the free propagation of Hermite–Gaussian beams diffracted by a symmetrical annular aperture placed at the beam waist plane. The propagation is studied analytically and numerically using the angular spectrum method and the 2D fast Fourier transformation. Numerical simulation examples illustrate the propagation characteristics of the Hermite–Gaussian beams diffracted by an annular aperture. The beam truncation parameters and obscuration ratio inﬂuence Hermite–Gaussian beam diffraction properties.