Abstract
We consider the transformation of a Gaussian laser beam into a flat-top intensity profile or into an optical bottle beam (OBB) by resorting to a diffractive or an interferometric method. The diffractive technique is based on the use of a diffractive optical element consisting in a π-plate, while the interferometric technique uses a Michelson interferometer (MI). The coaxial superposition of two coherent Gaussian beams yields to a flat-top or a OBB in the focal plane of a lens depending on the geometric characteristics of the MI. The performances of the two techniques are compared.
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