Fast convergence and high precision phase recovery method

Abstract

The invention provides a fast convergence and high precision phase recovery method, capable of meeting the requirements for solving of the complex amplitude of the light field, with fast convergence and high precision, avoiding the problem that the algorithm is easily influenced by an initial assumed value and is not easy to converge, and avoiding the problem that the solving precision is not highdue to parameterization of the complex amplitude of the light field. The fast convergence and high precision phase recovery method comprises the following steps: firstly, assuming a group of random distribution coefficients, obtaining object plane initial assumed photofield complex amplitude distribution according to a light intensity calculation model and a phase calculation model, and obtainingobject plane initial assumed photofield complex amplitude distribution based on simulated annealing-phase calculation; adopting a global convergence optimization algorithm of the genetic algorithm, carrying out fast convergence to obtain an optimized coefficient value, and then obtaining a global optimal solution of complex amplitude distribution of the tested optical field with low initial precision according to the optimized coefficient value; and taking the globally optimal solution of the complex amplitude distribution of the light field to be measured with low initial precision as the initial solution of adaptive angular spectrum calculation, and finally solving to obtain the high-precision light field complex amplitude distribution of the object plane position through iterative calculation.

Description

technical field [0001] The invention belongs to the field of optics, and relates to a phase recovery method for solving the complex amplitude of an optical field with fast convergence and high precision, in particular to a phase recovery method based on a parameterized mode method and adaptive angle spectrum calculation. Background technique [0002] The phase recovery technology uses the diffraction model of the light field to perform diffraction calculations on the hypothetical input light field to obtain the light field intensity distribution on the output surface, and compare the calculated light field intensity on the output surface with the light field intensity generated by the real phase to obtain The minimum error between the two is the criterion, and the phase distribution that is most consistent with the real light field intensity distribution is obtained through calculation of different phase recovery algorithms. [0003] In 1972, Gerchberg and Saxton proposed th...

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Problems solved by technology

[0007] The invention proposes a phase recovery method with fast convergence and high precision, which meets the requirements of fast convergence and high precision to solve the complex amplitude of the light field, avoids the problem that the algorithm is easily affected by the initial assumption value and is difficult to converge, and avoids the problem that the light The problem of low solution accuracy caused by field complex amplitude parameterization

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