非线性光场调控实现12倍相位超分辨实时干涉测量  

Twelvefold phase superresolution interferometric measurement in realtime via nonlinear light field control

作　　者：张鑫宇 吴海俊 Carmelo Rosales-Guzmán 白振旭 朱智涵 胡小鹏[2] 祝世宁[2] Zhang Xinyu;Wu Haijun;Carmelo Rosales-Guzmán;Bai Zhenxu;Zhu Zhihan;Hu Xiaopeng;Zhu Shining(Wang Da-Heng Center,College of Measurement and Control Technology and Communication Engineering,Harbin University of Science and Technology,Harbin 150080,China;National Laboratory of Solid-State Microstructures,Nanjing University,Nanjing 210093,China;Advanced Laser Technology Research Center,Hebei University of Technology,Tianjin 300401,China)

机构地区：[1]哈尔滨理工大学测控技术与通信工程学院大珩协同创新中心,黑龙江哈尔滨150080 [2]南京大学固体微结构物理国家重点实验室,江苏南京210093 [3]河北工业大学先进激光技术研究中心,天津300401

出　　处：《红外与激光工程》2023年第8期310-314,共5页Infrared and Laser Engineering

基　　金：国家自然科学基金项目(62075050,11934013,61975047);国家重点研发计划项目(2019YFA0705000);黑龙江省自然科学基金项目(UNPYSCT-2020185,LH2022A016)。

摘　　要：光学干涉仪是现代精密测量技术的核心支撑,但其分辨率受到光源波长的限制,无法通过无限减小波长提高分辨率,而“相位超分辨”即是指设法解决光源波长限制的技术手段。目前“相位超分辨”研究主要通过调控N光子纠缠态的途径实现,但是由于N光子纠缠态制备与调控的极高难度和符合计数的极低效率使得该途径无法用于实际测量。针对这一瓶颈,笔者联合团队利用轨道角动量(OAM)相干态在光学超晶格中的级联参量上转换过程高效构造、提取多光子复振幅信号。实现了N=12倍的相位超分辨干涉信号的实时测量,为发展可实际应用的高倍率相位超分辨干涉测量技术提供了一条全新的物理途径。Objective Optical interferometry metrology techniques and devices are pillars of modern precision metrology.With the development of laser and light field shaping technologies,their performance has achieved significant improvements across multiple orders of magnitude.However,they are still limited by the wavelength of the light source.Due to the easy absorption and difficult manipulation of extremely short-wavelength optical fields,the resolution of interferometers cannot be infinitely improved by simply reducing the wavelength."Phase superresolution"refers to the technological means to overcome the limitation imposed by the light source wavelength.Currently,research on phase superresolution mainly focuses on manipulating N-photon entangled states to achieve this goal.However,the extremely high difficulty in preparing and controlling N-photon entangled states,as well as the low efficiency of coincidence counting,renders this approach impractical for actual measurements.Therefore,it is necessary to realize real-time phase superresolution measurements to meet practical application requirements.Methods To overcome these aforementioned cutting-edge challenges,the collaborative team has taken a novel approach of utilizing the modal structure evolution of orbital angular momentum(OAM)coherent states during parametric conversion processes to simulate the behavior of N00N states in SU(2).Consequently,they have achieved a more efficient means of actively preparing multi-photon amplitude signals carrying interferometer arm phase information.Results and Discussions Phase superresolution signal carried by coherent states with an N-fold enhancement(N=4)has been achieved in a single artificial metamaterial crystal using multiple quasi-phase matching in quasiperiodic optical superlattice(Fig.1(a)).By cascading parametric conversions of the superresolution signal,a phase superresolution interference signal with enhanced resolution of up to N=12 has been realized.Remarkably,the signal intensity remains visible to the naked eye,and

关 键 词：相位超分辨 非线性光学 光场调控 

分 类 号：O437[机械工程—光学工程]