24 October 2002 Online laser beam characterization by means of diffractive optical correlation filters
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Abstract
Analyzing the transversal modal content of a laser beam is a promising tool to evaluate the quality of a beam and to understand its propagation behavior. Whereas a complete description of the beam by superposition of its transversal modal components usually requires knowledge about strength and relative phase delay of the individual modes, for certain important applications information about relative strength of individual modes is sufficient to evaluate beam quality. The present work discusses in detail an approach to designate the strength of few pre-selected modes contained in a given laser beam by applying computer generated amplitude holograms as correlation filters. Quality of different coding methods for the complex transmission function of the filters is compared, and experimental results obtained from various optical set-ups are presented.
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Michael Rudolf Duparre, Carsten Rockstuhl, "Online laser beam characterization by means of diffractive optical correlation filters", Proc. SPIE 4770, Laser Beam Shaping III, (24 October 2002); doi: 10.1117/12.451638; https://doi.org/10.1117/12.451638
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