Super-oscillation sub-diffraction focusing with emulated atmospheric turbulence

IF 3.5 2区工程技术 Q2 OPTICS Optics and Lasers in Engineering Pub Date : 2024-11-09 DOI:10.1016/j.optlaseng.2024.108675

Na Yao , Jiao Jiao , Jingxuan Duan , Mo Chen , Duanpeng He

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Abstract

The super-oscillation (SO) phenomena successfully applied to super-resolution optical telescopes have yet to study the existence of atmospheric turbulence (AT). In this paper, we first experimentally investigate the sub-diffraction focusing of the SO light field in the atmospheric-like turbulence. The 137-element adaptive optics (AO) system is utilized to correct the dynamic wavefront aberration produced by the AT and obtain the AO closed-loop RMS of the residual wavefront error ∼λ/15. For a proofed telescope (clear aperture 12 mm and focal length 1000 mm) @λ=632.8 nm, the FWHM of the experimental SO spot under the modest AT (wavefront error RMS ∼0.57λ) is about 0.79 times of the Airy spot compared with the non-AT result of 0.76 times, while the strong AT (wavefront error RMS ∼1.35λ) erases the sub-diffraction focusing effect of the SO field and the average side-lobe intensity increases significantly. This study is promising for super-resolving telescope, synthetic aperture for visible imaging, etc.

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利用模拟大气湍流进行超振荡子衍射聚焦

成功应用于超分辨率光学望远镜的超振荡（SO）现象尚未研究大气湍流（AT）的存在。在本文中，我们首先通过实验研究了类大气湍流中 SO 光场的次衍射聚焦。利用 137 元自适应光学（AO）系统校正 AT 产生的动态波前像差，并获得 AO 闭环残余波前误差 RMS ∼λ/15。对于经过校准的望远镜（透明孔径 12 mm，焦距 1000 mm）@λ=632.8 nm，在适度 AT（波前误差均方根∼0.57λ）下，实验 SO 光斑的 FWHM 约为 Airy 光斑的 0.79 倍，而非 AT 的结果为 0.76 倍；而在强 AT（波前误差均方根∼1.35λ）下，SO 场的次衍射聚焦效应被消除，平均侧叶强度显著增加。这项研究有望用于超分辨望远镜、可见光成像合成孔径等。

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来源期刊

Optics and Lasers in Engineering 工程技术-光学

CiteScore

8.90

自引率

8.70%

发文量

384

审稿时长

42 days

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