Open AccessBeam characterization by phase retrieval solving the transport-of-intensity-equation
Author(s) -
Sebastian Merx,
Johannes Stock,
Fransiska R Widiasari,
Herbert Groß
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.394633
Subject(s) - phase retrieval , optics , paraxial approximation , phase (matter) , laser , physics , basis (linear algebra) , metric (unit) , iterative method , intensity (physics) , beam (structure) , fourier transform , algorithm , computer science , mathematics , geometry , operations management , quantum mechanics , economics
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.