Formation of a laser beam with a uniform spatial distribution

The feasibility of obtaining a uniform laser beam intensity distribution in a system formed by a hard aperture and a spatial filter was studied. Various levels of limitation of a Gaussian beam by the aperture were analyzed and methods of transfer of an image of its intensity profile in a narrow spectrum of spatial frequencies were examined. Conditions for the formation of a near-uniform spatial distribution in a laser beam were determined. These can be applied to a linear medium and to a laser amplifier.