Wavefront Aberration Sensor Based on a Multichannel Diffractive Optical Element

Abstract

<jats:p>We propose a new type of a wavefront aberration sensor, that is, a Zernike matched multichannel diffractive optical filter, which performs consistent filtering of phase distributions corresponding to Zernike polynomials. The sensitivity of the new sensor is theoretically estimated. Based on the theory, we develop recommendations for its application. Test wavefronts formed using a spatial light modulator are experimentally investigated. The applicability of the new sensor for the fine-tuning of a laser collimator is assessed.</jats:p>

Optical Computing: Status and Perspectives

“…Despite the advent of dynamically controlled SLMs, the use of DOEs in Fourier correlators remains relevant in high-energy applications [29] since they have a significantly higher damage threshold than SLM. Soifer et al have designed a multichannel spatial optical that allows coherent light fields to be optically decomposed into a series of orthogonal functions: using angular harmonics to calculate the light field's angular momentum [30][31][32][33][34], detection and analysis of wavefront aberrations using Zernike polynomials [35][36][37][38][39], and using the optical Karhunen-Loeve decomposition, we may derive decorrelated image characteristics [40,41]. Relying on segmented spatial filters in the sequence of diffraction gratings, an optical approach for producing a directions field for fringed/contour pictures such as interferograms and fingerprints has been established [42][43][44][45].…”

Simplifying the Experimental Detection of the Vortex Topological Charge Based on the Simultaneous Astigmatic Transformation of Several Types and Levels in the Same Focal Plane

“…In order to not have to perform additional optical adjustments of the optical system, it was proposed to carry out simultaneous astigmatic transformations of various types and levels based on the use of multi-channel DOEs [ 56 , 57 , 58 ].…”

“…Therefore, in order to form an astigmatic beam pattern suitable for the clear detection of the TC, an optical tuning (changing the lens tilt and/or the detection distance) is often required. In this paper, for the simultaneous implementation of astigmatic transformations of various types and levels, we propose to use multi-channel diffractive optical elements (DOEs) [ 56 , 57 , 58 ]. To design a multi-channel DOE matched with several aberrations, we use the method of spatial carrier frequencies [ 59 ].…”

Modern Types of Axicons: New Functions and Applications

“…Various methods of wavefront detection are known, including interferometry [ 248 ], Shack–Hartmann sensors [ 249 , 250 ], multi-order diffractive optical elements that perform expansion in the basis of Zernike functions [ 251 , 252 ], as well as digital methods focused on phase recovery according to the intensity distribution patterns [ 253 , 254 , 255 ]. Moreover, for digital data processing, neural networks are increasingly used [ 256 , 257 , 258 ].…”