Beam homogenizer

Most beam homogenizers use a multifaceted mirror with square facets.

The mirror reflects light at different angles to create a beam with uniform power across the whole beam profile (a "top hat" profile).

Most lasers produce a Gaussian beam energy distribution.

[1] A simple beam homogenizer can be just a murky piece of glass.

However, this is a very simple solution with low efficiency, producing a blurry beam.

Intensity profile after use of diffractive homogenizer with coherent beam. Courtesy of Holo/Or