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An error-based observer improved by the repetitive control strategy for electro-optical tracking systems

Frontiers of Information technology & Electronic Engineering 2025年第3期26卷 441-455页

作者： Mai TANG Wenqiang XIA Jiuqiang DENG Yao MAO National Key Laboratory of Optical Field Manipulation Science and Technology Chinese Academy of SciencesChengdu 610209China Key Laboratory of Optical Engineering Chinese Academy of SciencesChengdu 610209China Institute of Optics and Electronics Chinese Academy of SciencesChengdu 610209China University of Chinese Academy of Sciences Beijing 101408China

Electro-optical tracking systems have been widely used in the cutting-edge domains of free space environment detection and communication owing to their exceptional ***,external disturbances often significantly impact the working accuracy of these *** their scope of application continues to broaden,increasingly complex operating conditions introduce more intricate environments and *** paper introduces a composite control structure of an enhanced error-based observer,rooted in the repetitive control strategy,tailored for two types of complex disturbances:periodic harmonic disturbance and narrow-band peak periodic *** structure not only ensures the system's stability,but also suppresses periodic disturbances across multiple frequencies,effectively addressing the challenge that current disturbance suppression methods face in mitigating complex periodic ***,necessary proofs are provided and an experimental platform is established for the electro-optical system,demonstrating the efficacy and reliability of the proposed control methods under various conditions.

关键词： Disturbance suppression Error-based observer Repetitive control Electro-optical tracking system Specific frequency point

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Superimposed Fiber Bragg Gratings With Comb-Like Reflection Peaks Inscribed by Femtosecond Laser

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Journal of Lightwave technology 2025年第9期43卷 4485-4490页

作者： Lv, Ruilong Yang, Dexing Jiang, Yajun Liu, Chi Zou, Jie Zhao, Kangzhe Liao, Xinya Xue, Ting Yan, Jiahui Xiong, Yaorui Wang, Bin Northwestern Polytechnical University School of Physical Science and Technology Shaanxi Key Laboratory of Optical Information Technology Key Laboratory of Light-Field Manipulation and Information Acquisition Ministry of Industry and Information Technology Xi’an710129 China

We propose a novel method for inscribing superimposed fiber Bragg gratings (SIFBGs) with comb-like reflection peaks using femtosecond laser and phase mask method. By superimposing only two uniform fiber Bragg gratings (FBGs) with slightly different periods at the same location within the fiber core, we achieve the formation of a strong SIFBG that exhibits nearly 11 equal spaced reflection peaks. Furthermore, more than 30 reflection peaks can be easily obtained by superimposing only three FBGs. We found that the spacing of the reflection peaks in the SIFBG is determined by its period, while the number of reflection peaks corresponds to the quantity of FBGs that are superimposed. All reflection peaks of the SIFBG demonstrate essentially identical temperature and strain sensitivities. Additionally, these SIFBGs exhibit remarkable high-temperature resistance characteristics. © 1983-2012 IEEE.

关键词： Femtosecond lasers

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Hybrid meta-optics facilitate an athermal continuous zoom optical system

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Optics Express 2025年第8期33卷 17121-17135页

作者： Tang, Yufeng Mao, Shan Song, Yichen Zhao, Jianlin Key Laboratory of Light Field Manipulation and Information Acquisition Ministry of Industry and Information Technology Shaanxi Key Laboratory of Optical Information Technology School of Physical Science and Technology Northwestern Polytechnical University Xi’an710129 China Shaanxi Key Laboratory of Optical Remote Sensing and Intelligent Information Processing Xi’an710119 China

To meet the demand for continuous zoom capabilities in compact lenses over a wide temperature range, we designed a compact continuous zoom optical system based on hybrid meta-optics. This system can achieve thermal stability without additional heating or cooling across a broad temperature range, utilizing commonly available optical glass. It features a total length of just 9∼12 mm and comprises only 4 lenses. By incorporating metalens, the system effectively corrects chromatic aberration and off-axis distortion, while leveraging the thermal stability of these lenses to achieve passive thermal management. Analytical results demonstrate that the system is structurally compact, capable of smooth continuous zooming from -20∼+60 ℃ with a focal length range of 4.9∼9.8 mm, and maintains excellent imaging quality throughout (with a modulation transfer function greater than 0.5 at 100 lp/mm). Additionally, the zoom and tolerances are highly feasible. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Aberrations

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Metalens-based hybrid probe near-infrared endoscope objective

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Optics Express 2025年第3期33卷 5757-5768页

作者： Song, Yichen Mao, Shan Tang, Yufeng Zhao, Jianlin Key Laboratory of Light Field Manipulation and Information Acquisition Ministry of Industry and Information Technology Shaanxi Key Laboratory of Optical Information Technology School of Physical Science and Technology Northwestern Polytechnical University Xi’an710129 China Shaanxi Key Laboratory of Optical Remote Sensing and Intelligent Information Processing Xi’an710119 China

Rapid large-area deep tissue imaging at long working distances is important for clinical diagnosis. A near-infrared metalens-based hybrid probe con-focal micro-endoscope (pCM) objective with a large field of view of 500 µm, a long working distance of 300 µm, and a small caliber of 2.2 mm was designed, which is compatible with conventional endoscopes to produce cell-resolution images of deep tissues. The performance of the metalens-based hybrid objective optical system was analyzed. Results show that the metalens-based hybrid pCM significantly improves the imaging quality of such optical systems under the premise of meeting the design accuracy requirements, which provides a new solution and an effective realization for the design of such optical systems. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Infrared devices

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Parallel-filter observer control with CCD measurements for space optical communication equipment on a moving platform

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Optics Express 2025年第3期33卷 5271-5286页

作者： Miao, Qingqing Bian, Qihui Qi, Bo Tang, Tao National Key Laboratory of Optical Field Manipulation Science and Technology Chinese Academy of Sciences Chengdu China Key Laboratory of Optical Engineering Chinese Academy of Sciences Chengdu China Institute of Optics and Electronics Chinese Academy of Sciences Chengdu China University of Chinese Academy of Sciences Beijing China

This paper reports a parallel-filter observer methodology to stabilize the line-of-sight (LOS) for space optical communication missions, which breaks the bandwidth limitation for achieving trajectory tracking on a moving platform with charge-coupled device (CCD) measurements. An equivalent high-order parallel-filter compensator is introduced to reduce the output of the controller, resulting in a stabilized high-bandwidth observer. The parallel-filter observer effectively mitigates the stability degradation associated with a single high-bandwidth filter. Furthermore, a high-bandwidth rate loop is conducive to ensuring the stability of the tracking gimbal in inertial space. The proposed approach directly uses and processes tracking errors to achieve LOS stabilization rather than relying on detailed knowledge of target dynamics to evaluate and compensate for target trajectory. Therefore, it is simple and applicable to provide excellent tracking performance for engineering applications with limited measurement bandwidth. Simulation and experimental results demonstrate the effectiveness of the proposed method for improving LOS stabilization in a tracking system with carrier disturbance and target motion. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Bandwidth

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Ultra-high-Q photonic crystal nanobeam cavity for etchless lithium niobate on insulator(LNOI)platform

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Opto-Electronic Advances 2025年第1期8卷 59-70页

作者： Zhi Jiang Cizhe Fang Xu Ran Yu Gao Ruiqing Wang Jianguo Wang Danyang Yao Xuetao Gan Yan Liu Yue Hao Genquan Han State Key Laboratory of Wide-Bandgap Semiconductor Devices and Integrated Technology School of MicroelectronicsXidian UniversityXi’an 710071China Key Laboratory of Light Field Manipulation and Information Acquisition Ministry of Industry and Information Technologyand Shaanxi Key Laboratory of Optical Information TechnologySchool of Physical Science and TechnologyNorthwestern Polytechnical UniversityXi’an 710129China Hangzhou Institute of Technology Xidian UniversityHangzhou 311200China

The expansive spectral coverage and superior optical properties of lithium niobate(LN)offer a comprehensive suite of tools for exploring novel *** high-quality(Q)photonic resonator cavities is crucial for enhancing light-matter ***,this task is challenging as the device performance is heavily dependent on the fabrication quality of the *** this paper,we present experimental validation of an etchless approach to fabricating high-Q photonic crystal nanobeam cavities(PCNBCs).We successfully fabricate PCNBCs with Q factors exceeding 105 while maintaining high transmittance by capitalizing on the low waveguide loss and high fabrication tolerance of TE-polarized ***,the Q factor achieved here exceeds previous reports on etchless LN PCNBCs by over an order of *** from this advancement,we further explore a variety of optical functions,including thermo-optic tuning,optically induced bistability,and Fano line shapes *** findings present promising prospects for a versatile platform technique,facilitating the development of high-performance electro-optic or acousto-optic modulators,optical logic devices,and quantum photonics,highlighting its significant impact in the field of photonic integration.

关键词： photonic crystal nanobeam cavity LNOI platform high Q thermo-optic tuning bistability Fano line shapes

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A time-domain averaging method for wavefront aberration calibration 10

A time-domain averaging method for wavefront aberration cali...

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10th Symposium on Novel Optoelectronic Detection technology and Applications

作者： Zhai, Fangxuan Luo, Jianyao Li, Jianke Quan, Haiyang Wang, Jian Hu, Song National Key Laboratory of Optical Field Manipulation Science and Technology Chinese Academy of Sciences China Institute of Optics and Electronics Chinese Academy of Sciences China

ISBN: (数字)9781510688155

ISBN: (纸本)9781510688148

With the rapid development of semiconductor technology, the performance and demand for high-resolution optical system, such as deep-ultraviolet lithography, have gradually increased. The lithography objective is the core component of the lithography machine, and its aberration directly affects the resolution and yield of the lithography machine. Therefore, realizing high-precision optical system wavefront measurement is crucial for the fabrication of high-resolution optical system. The quality of the light source affects the image quality and the accuracy of the measurement results. In the wavefront measurement, diffraction phenomena in the laser can cause light intensity non-uniformity in the emitted spot, which seriously affects the measurement results. Obviously, in the calibration process of single-channel wavefront aberration in the deep ultraviolet, the problem of non-uniform light intensity distribution occurred This phenomenon causes the wavefront sensor to be unable to accurately calibration. Thus, reducing the non-uniformaity of the light intensity distribution is necessary for achieving high-precision wavefront calibration. To address this issue, this paper proposes a method to reduce the unevenness of light intensity distribution in the wavefront calibration by time-domain averaging. In this experiment, it is demonstrated that making the diffuser physically move can effectively suppress the non-uniform light intensity in wavefront calibration through the time-domain averaging method. This study provides a new way to reduce the light intensity non-uniformity for single-channel wavefront measurements, and also lays the foundation for future optimization of optical measurement techniques, to achieve higher imaging quality and measurement accuracy. © 2025 SPIE.

关键词： optical systems

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Electro-optic tuning in ferroelectric capacitor with photonic crystal nanobeam cavity

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science China(Information sciences) 2025年第2期68卷 393-394页

作者： Tongtong WANG Yong ZHANG Danyang YAO Zhi JIANG Dongxin TAN Jie WEN Qiyu YANG Xuetao GAN Yan LIU Yue HAO Genquan HAN State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology School of MicroelectronicsXidian University Key Laboratory of Light Field Manipulation and Information Acquisition Ministry of Industry and Information TechnologyShaanxi Key Laboratory of Optical Information TechnologySchool of Physical Science and TechnologyNorthwestern Polytechnical University Hangzhou Institute of Technology Xidian University

Silicon photonics has provided a platform for the convergency of photonic devices and electronic circuits, facilitating the development of optical telecommunications and optical interconnects on chip [1]. As the basic building block of optical communication systems, electro-optic tuning is expected to be more compact, high bandwidth, energy efficient, and allow for CMOS-compatible fabrication in the future [2]. Resonator-based electro-optic tuning has attracted more and more interest due to the small footprint, enhanced light-matter interactions and high energy efficiency. Compared with microring and microdisk resonators, photonic crystal nanobeam cavities(PCNBCs) realize higher quality factors, stronger light-matter interactions, ultrasmall mode volume and a much larger free spectral range(FSR) [3].

关键词： Hysteresis

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Vectorial Digitelligent Optics for High-Resolution Non-Line-of-Sight Imaging

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Engineering 2025年第2期45卷 70-78页

作者： Yinghui Guo Yunsong Lei Mingbo Pu Fei Zhang Qi Zhang Xiaoyin Li Runzhe Zhang Zhibin Zhao Rui Zhou Yulong Fan Xiangang Luo National Key Laboratory of Optical Field Manipulation Science and Technology Institute of Optics and ElectronicsChinese Academy of SciencesChengdu 610209China State Key Laboratory of Optical Technologies on Nano-Fabrication and Micro-Engineering Institute of Optics and ElectronicsChinese Academy of SciencesChengdu 610209China Research Center on Vector Optical Fields Institute of Optics and ElectronicsChinese Academy of SciencesChengdu 610209China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 100049China Tianfu Xinglong Lake Laboratory Chengdu 610299China

Object imaging beyond the direct line of sight is significant for applications in robotic vision,remote sensing,autonomous driving,and many other *** of a non-line-of-sight(NLOS)screen is a complex inverse problem that comes with ultrafast time-resolved imager requirements and substantial computational demands to extract information from the multi-bounce scattered ***,the echo signal always suffers from serious deterioration in both intensity and shape,leading to limited resolution and image ***,we propose a concept of vectorial digitelligent optics for high-resolution NLOS imaging to cancel the wall’s scattering and refocus the light onto hidden targets for enhanced *** this approach,the polarization and wavefront of the laser spot are intelligently optimized via a feedback algorithm to form a near-perfect focusing pattern through a random scattering *** raster scanning the focusing spot across the object’s surface within the optical-memory-effect range of the wall,we obtain nearly diffraction-limited NLOS imaging with an enhanced signal-to-noise *** experimental results demonstrate a resolution of 0.40 mm at a distance of 0.35 m,reaching the diffraction limit of the ***,we demonstrate that the proposed method is feasible for various complex NLOS *** methods may open an avenue for active imaging,communication,and laser wireless power transfer.

关键词： Non-line-of-sight imaging Vectorial digitelligent optics Spatial light modulator Digital optics Wavefront shaping Metasurface

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High-precision interferometric measurement method for the radius of curvature with a computer-aided adjustment model

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Optics Express 2025年第9期33卷 18791-18809页

作者： Wu, Yongqin Hou, Xi Zhang, Shuai Zhao, Yifan Hu, Xiaochuan National Key Laboratory of Optical Field Manipulation Science and Technology Chinese Academy of Sciences Sichuan Chengdu610209 China Institute of Optics and Electronics Chinese Academy of Sciences Sichuan Chengdu610209 China University of Chinese Academy of Sciences Beijing100049 China

In order to achieve high-precision measurement of the radius of curvature, this paper proposes an interferometric measurement method with a computer-aided adjustment model. This model is based on the principle of light propagation and derives the parameters of the adjustment error caused by the misalignment. According to the relationship between the adjustment error and the surface change at the null point positions, the adjustment amount of the tested sphere is calculated. By adjusting the position of the tested sphere several times, the measurement error is reduced. Then, an interferometer model is established to simulate and validate the mathematical model, which is further validated through experiments. The proposed method is applied to measure the sphere with a nominal radius of -146.0076 mm. The experimental results show that the repeatability of the radius measurement is improved from 4.0 ppm to 1.7 ppm with the computer-aided adjustment model, which is nearly 2.3 times improved in precision. It also helps to improve the efficiency of the radius measurement. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Interferometry

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