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.

中文翻译：

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通过相位检索来表征光束强度，从而解决了强度方程的传输问题。

提出了一种表征相干激光束的新方法。它基于强度方程的非迭代解。恢复的相位被分解为激光束的近轴特性和一组横向偏移的径向基函数，从而可以通过最小二乘拟合推导该相位的直接解，而无需进行初始猜测。该方法用合成数据进行测试以得出准确性指标。另外，表征了两个真实的激光束。就重构场而言，包括真实光源可以对光学系统进行更全面的仿真。