{"title":"Detecting topological charge and phase of the vortex beam embedded into the low coherence background","authors":"Amit Yadav , Tushar Sarkar , Takamasa Suzuki , Rakesh Kumar Singh","doi":"10.1016/j.optlaseng.2024.108668","DOIUrl":null,"url":null,"abstract":"<div><div>We propose and experimentally demonstrate a single-path interferometric approach to quantify the higher-order topological charge (TC) and phase structure of a vortex beam embedded into a low-coherence background. The topological charge is determined by an in-line and common path configuration for superposing the fluctuating coherent beams loaded with vortex and non-vortex features. Ensemble average of the intensities of the superimposed fluctuating fields generates petal structure, and the number of petals infers the absolute value of the topological charge of the vortex beam. Furthermore, a three-step phase-shifting method along with a single-path interferometer is utilized to recover the phase and spectra of the TCs in the beams embedded into a low-coherence background. The results of our experiment demonstrate successful measurement of vortex beam with TCs up to 150. We believe that such petal patterns with incoherent light will be useful in sensing the rotation and motion of optically rough objects.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"184 ","pages":"Article 108668"},"PeriodicalIF":3.5000,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Optics and Lasers in Engineering","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0143816624006468","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"OPTICS","Score":null,"Total":0}
引用次数: 0
Abstract
We propose and experimentally demonstrate a single-path interferometric approach to quantify the higher-order topological charge (TC) and phase structure of a vortex beam embedded into a low-coherence background. The topological charge is determined by an in-line and common path configuration for superposing the fluctuating coherent beams loaded with vortex and non-vortex features. Ensemble average of the intensities of the superimposed fluctuating fields generates petal structure, and the number of petals infers the absolute value of the topological charge of the vortex beam. Furthermore, a three-step phase-shifting method along with a single-path interferometer is utilized to recover the phase and spectra of the TCs in the beams embedded into a low-coherence background. The results of our experiment demonstrate successful measurement of vortex beam with TCs up to 150. We believe that such petal patterns with incoherent light will be useful in sensing the rotation and motion of optically rough objects.
期刊介绍:
Optics and Lasers in Engineering aims at providing an international forum for the interchange of information on the development of optical techniques and laser technology in engineering. Emphasis is placed on contributions targeted at the practical use of methods and devices, the development and enhancement of solutions and new theoretical concepts for experimental methods.
Optics and Lasers in Engineering reflects the main areas in which optical methods are being used and developed for an engineering environment. Manuscripts should offer clear evidence of novelty and significance. Papers focusing on parameter optimization or computational issues are not suitable. Similarly, papers focussed on an application rather than the optical method fall outside the journal''s scope. The scope of the journal is defined to include the following:
-Optical Metrology-
Optical Methods for 3D visualization and virtual engineering-
Optical Techniques for Microsystems-
Imaging, Microscopy and Adaptive Optics-
Computational Imaging-
Laser methods in manufacturing-
Integrated optical and photonic sensors-
Optics and Photonics in Life Science-
Hyperspectral and spectroscopic methods-
Infrared and Terahertz techniques