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This work continues a series of papers where we propose an algorithm forquasioptical modeling of electromagnetic beams with and without modeconversion. The general theory was reported in the first paper of this series,where a parabolic partial differential equation was derived for the fieldenvelope that may contain one or multiple modes with close group velocities.Here, we present a corresponding code PARADE (PAraxial RAy DEscription) and itstest applications to single-mode beams in vacuum and also in inhomogeneousmagnetized plasma. The numerical results are compared, respectively, withanalytic formulas from Gaussian-beam optics and also with cold-plasma raytracing. Quasioptical simulations of mode-converting beams are reported in thenext, third paper of this series.

Quasioptical modeling of wave beams with and without mode conversion: II. Numerical simulations of single-mode beams