FIELD: physics, optics.
SUBSTANCE: method involves formation of an initial converging laser beam and converting it to a beam with polarisation mode distributed on the aperture using a birefringent element, polarisation filtering of the beam with a polariser, adjustment of the spatial profile of intensity of the beam by rotating the birefringent element, or the polarisation vector of the initial converging beam, or polariser. The birefringent element is a birefringent plate lying between telescopic lenses and enables creation of a non-identical angle between the axis of the birefringent plane and the wave vector of an extraordinary ray for identical angles of deviation of the rays from the axis of the beam, which enables formation of a parabolic spatial profile of intensity after polarisation filtering, identical in one of the planes along the direction of propagation and all planes parallel to the said plane on the entire aperture of the beam.
EFFECT: formation of a laser beam with a parabolic spatial profile of intensity with controlled level of intensity of radiation at the centre of the parabola, as well as controlled position of the parabola on the aperture of the beam.
3 dwg
