Laser systems often use a pinhole aperture called a spatial filter. Spatial filtering is a technique used to improve laser quality by removing higher-order modes and noise in the beam. To accurately model laser propagation through a spatial filter in FRED, it is important to re-synthesize the light field just after the filter. Doing so will accurately model clipping at the aperture. In this note, a light synthesis technique called Gabor decomposition will be described.
A full description of this application example can be found here: Spatial Filter Application Example