A Super-resolution Wavefront Restoration Method for Hartmann Wavefront Sensor

Abstract

A hartmann wavefront sensor super-resolution wavefront reconstruction method includes adopting the optical structure of a classic hartmann wavefront sensor, utilizing facula array images acquired through a photoelectric detector array as optical wave far field frequency domain signals, conducting iterative convergence between near field empty domain wavefront unknown quantities and far field frequency domain facula known quantities through an optical diffraction formula and a phase inversion basic mathematical process according to a complex amplitude transmittance function of a microlens array to finally obtain a high accuracy wavefront measurement result of the resolution of a superfine lens. By modifying the hartmann wavefront sensor restoring algorithm, the limit that the wavefront restoring resolution is limited by the resolution of the microlens array is removed, the hartmann wavefront sensor facula array image information is fully utilized, facula dispersion information troubling the facula mass center detection is utilized to effectively improve the wavefront detection accuracy, the need and dependency on the high-density microlens array are reduced, and the method can be applied to the fields of high-accuracy wavefront detection, weak signal wavefront detection and the like.

Description

technical field [0001] The invention belongs to the technical field of optical information measurement, and relates to a method for measuring the wavefront of an incident light beam, in particular to a super-resolution wavefront restoration method for a Hartmann wavefront sensor. Background technique [0002] As a typical modern optical measurement method, the wavefront sensor has many characteristics such as high precision, high speed and high sensitivity, and has been widely used in adaptive optics, optical detection, photoelectric detection, laser communication and other fields. Especially for adaptive optics systems, real-time detection of optical wavefronts is an important prerequisite for stable and efficient correction of beam wavefront aberrations. At present, a variety of wavefront measurement methods have been used in practice, such as shear interference wavefront sensing technology, Hartmann wavefront sensing technology, curvature wavefront sensing technology and ...

AI Technical Summary

Problems solved by technology

Therefore, the research on improving the detection accuracy of the Hartmann wavefront sensor is mainly focused on improving the detection accuracy of the spot centroid (or the wavefront slope in the sub-aperture), and its main purpose is to divide the sampling array when the spatial resolution is limited by the wavefront. Under the condition of components, the wavefront restoration with higher accuracy can be achieved as much as possible, but this fundamental limitation cannot be broken through

Images