Creating of non-circular laser spots, for example of linear, elliptical or rectangle shape, with uniform intensity profile is
important in various laser techniques in industry, scientific and medical applications. This task can be successfully
solved with applying of refractive beam shaping optics of field mapping type in combination with some additional
optical components. Due to their unique features, such as: low output divergence, high transmittance and flatness of
output beam profile as well as extended depth of field, the refractive field mappers provide a freedom in further
manipulation with intensity profile and shape of a laser beam. Typically design of refractive field mapping beam shapers
has circular symmetry; therefore creating of non-circular spot shapes requires applying anamorphic optical components
(cylinder lenses, prism pairs, etc.) ahead of or after a beam shaper. As result it becomes possible to provide various
combinations of spot shape and intensity profiles, for example: roof-like spot with uniform intensity in one direction and
Gaussian or triangle profile in another direction, linear spots with aspect ratio up to 1:1000, elliptical spots of uniform
intensity, etc. Applications include flow cytometry instrumentation, particle image velocimetry, particle size analyzing,
hardening, cladding, annealing, and others.
This paper will describe some design basics of refractive beam shapers of the field mapping type and optical layouts for
creating laser spots of non-circular symmetry. Examples of real implementations will be presented as well.