Beam characterization by phase retrieval solving the transport-of-intensity-equation

A new method for the characterization of coherent laser beams is proposed. It is based on the non-iterative solution of the transport-of-intensity-equation. The phase to recover is decomposed into paraxial properties of laser beams and a set of lateral shifted radial basis functions, which allows fo...

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Veröffentlicht in:Optics express 2020-07, Vol.28 (14), p.20898-20907
Hauptverfasser: Merx, Sebastian, Stock, Johannes, Widiasari, Fransiska R., Gross, Herbert
Format: Artikel
Sprache:eng
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Zusammenfassung:A new method for the characterization of coherent laser beams is proposed. It is based on the non-iterative solution of the transport-of-intensity-equation. The phase to recover is decomposed into paraxial properties of laser beams and a set of lateral shifted radial basis functions, which allows for the derivation of a direct solution of the phase by a least-squares fit without the need of an initial guess. The method is tested with synthetic data to deduce an accuracy metric. Additionally, two real laser beams are characterized. Including the real light source in terms of the reconstructed field allows for a more holistic simulation of optical systems.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.394633