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arXiv 2022年

作者： Wei, Chaoqi Liu, Jianbin Sun, Yunong Zhuang, Rui Zhou, Yu Zheng, Huaibin Liu, Yanyan Yan, Xiusheng Li, Fuli Xu, Zhuo Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education & International Center for Dielectric Research Xi’an Jiaotong University Xi’an710049 China The Key Laboratory of Weak Light Nonlinear Photonics Nankai University Ministry of Education Tianjin300457 China MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter Department of Applied Physics Xi’an Jiaotong University Shaanxi Xi’an710049 China Science and Technology on Electro-Optical Information Security Control Laboratory Tianjin300308 China

A new type of polarization sensitive interferometer is proposed, which is named as Delta interferometer due to the geometry of the simplest interferometer looks like Greek letter, Delta. To the best of our knowledge, it is the first time that this type of interferometer is proposed. The main difference between Delta interferometer and other existed interferometer, such as Michelson interferometer, Mach-Zehnder interferometer, Young’s double-slit interferometer, is that the two interfering paths are asymmetrical in Delta interferometer, which makes it polarization sensitive. The visibility of the first-order interference pattern observed in Delta interferometer is dependent on the polarization of the incidental light. optical coherence theory is employed to interpret the phenomenon and a single-mode continuous-wave laser is employed to verify the theoretical predictions. The theoretical and experimental results are consistent. Delta interferometer provides a perfect tool to study the reflection of electric field in different polarizations and may find applications in polarization sensitive scenarios. Copyright © 2022, The Authors. All rights reserved.

关键词： Electric fields

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Research on the Construction of a Novel Cyberspace security Ecosystem

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Engineering 2018年第1期4卷 47-52页

作者： Xiao-Niu Yang Wei Wang Xiao-Feng Xu Guo-Rong Pang Chun-Lei Zhang Science and Technology on Communication Information Security Control Laboratory Jiaxing Zhejiang 314033 China Science and Technology on Electro-Optical Information Security Control Laboratory Tianfin 300300 China

Given the challenges facing the cyberspace of the nation, this paper presents the tripartite theory of cyberspace, based on the status quo of cyberspace. Corresponding strategies and a research architecture are proposed for common public networks （C space）, secure classified networks （S space）, and key infras- tructure networks （K space）, based on their individual characteristics. The features and security require- ments of these networks are then discussed. Taking C space as an example, we introduce the SMCRC （which stands for ＂situation awareness, monitoring and management, cooperative defense, response and recovery, and countermeasures and traceback＂） loop for constructing a cyberspace security ecosys- tem. Following a discussion on its characteristics and information exchange, our analysis focuses on the critical technologies of the SMCRC loop. To obtain more insight into national cyberspace security, special attention should be paid to global sensing and precise mapping, continuous detection and active manage- ment, cross-domain cooperation and systematic defense, autonomous response and rapid processing, and accurate traceback and countermeasure deterrence.

关键词： Cyberspace security ecosystem SMCRC loop Tripartite theory of cyberspace

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Topologically Enhanced Circular Dichroism from Metasurfaces

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Physical Review Applied 2021年第3期16卷 L031001-L031001页

作者： Jiaxin Chen Lishuan Wang Wei Wu Wei Cai Huasong Liu Mengxin Ren Jingjun Xu Key Laboratory of Weak-Light Nonlinear Photonics Ministry of Education School of Physics and TEDA Applied Physics Institute Nankai University Tianjin 300071 People’s Republic of China Science and Technology on Electro-Optical Information Security Control Laboratory Tianjin 300308 People’s Republic of China Tianjin Key Laboratory of Optical Thin Film Tianjin Jinhang Technical Physics Institute Tianjin 300080 People’s Republic of China Collaborative Innovation Center of Extreme Optics Shanxi University Taiyuan Shanxi 030006 People’s Republic of China

Circular dichroism (CD) is one of the most distinctive properties of chiral materials. In recent decades, chiral metasurfaces have been regarded as a promising framework to realize chiral optical devices with ultrathin thickness and compact footprints. Various efforts have been devoted to increase the CD response from such metasurfaces. Here we present a method to enhance the CD effect from metasurfaces utilizing a topological concept. Two multilayered photonic crystals with different topological invariants are adopted and put in contact leading to the appearance of a topological edge state and a distinct electromagnetic field concentration at the interface. By embedding L-shaped chiral metasurfaces into the interface, the CD response is observed to be obviously boosted. We find that due to the robustness feature of the topological edge state, the spectral position of the CD peak is fixed at the edge-state wavelength and is immune to structural variation of the metasurface array. Considering that the multilayered films are easy to fabricate, such a topological concept could act as a simple and feasible strategy for enhancing chiral optical response from nanoscales, and could find wide applications in realizing ultracompact polarization-selective optical components.

关键词： Edge states Metamaterials optical & microwave phenomena Photonics Topological effects in photonic systems Devices

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Real-time and ultrafast optical pulse quantization based on slicing the supercontinuum

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Chinese Optics Letters 2021年第8期19卷 69-74页

作者： Ya Guo Qiang Cai Zhiwei Jia Bingjie Xu Zhensen Gao Qianwu Zhang Ruonan Zhang Adonis Bogris K.Alan Shore Yuncai Wang Pu Li Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China School of Information Engineering Guangdong University of TechnologyGuangzhou 510006China Key Laboratory of Specialty Fiber Optics and Optical Access Networks Shanghai UniversityShanghai 200444China School of Electronics and Information Northwestern Polytechnical UniversityXi’an 710072China Science and Technology on Communication Security Laboratory Institute of Southwestern CommunicationChengdu 610041China Department of Informatics and Computer Engineering University of West AtticaAthens 12243Greece School of Electronic Engineering Bangor UniversityWales LL571UTUnited Kingdom

All-optical analog-to-digital conversion is a paramount issue in modern science. How to implement real-time and ultrafast quantization to optical pulses with different intensities in an all-optical domain is a central problem. Here, we report a realtime demonstration of an all-optical quantization scheme based on slicing the supercontinuum in a nonlinear fiber. In comparison with previous schemes through off-line analysis of the power of different optical spectral components in the supercontinuum, this, to the best of our knowledge, is the first demonstration of such functionality online in the time ***, the extinction ratio among the quantized outputs can exceed 10 d B, which further confirms the feasibility of the proposed quantization scheme. The current 3 bit resolution in the proof-of-principle experiment is limited by the current experimental condition, but it can be expected to be greatly enhanced through improving both the spectral width of the generated supercontinuum and the number of filtering channels used.

关键词： all-optical analog-to-digital conversion photonic quantization all-optical signal processing supercontinuum generation

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Spatial beam shaping by using small-aperture SLM in a high power laser 3

Spatial beam shaping by using small-aperture SLM in a high p...

引用

High Power Lasers: technology and Systems, Platforms, Effects III 2019

作者： Li, Sensen Lu, Zhiwei Wang, Yulei Cai, Jun Zhao, Wanli Yan, Xiusheng Science and Technology on Electro-Optical Information Security Control Lab. China Harbin Institute of Technology China School of Electronics and Information Engineering Hebei University of Technology Tianjin300401 China

ISBN: (数字)9781510630284

ISBN: (纸本)9781510630277

High-power laser plays an important role in many fields, such as directed energy weapon, optoelectronic contermeasures, inertial confinement fusion, industrial processing and scientific research. The uniform nearfield is the important part of the beam quality for high power lasers, which is conducive to maintaining the high spatial beam quality in propagation. We demonstrate experimentally that the spatial intensity distribution at the output is well compensated in the complex high-power solid-state laser system by using the small-aperture spatial light modulator (SLM) in the front stage. The experimental setup is a hundred-Joule-level Nd:glass laser system operating at three wavelengths at 1053 nm (1ω), 527 nm (2ω) and 351 nm (3ω) with 3 ns pulse duration with the final output beam aperture of 60 mm. While the clear arperture of the electrically addressable SLM is less than 20 mm. In the beam shaping system, the key point is that the front-stage SLM needs to precompensate the gain nonuniform of the laser system. Liquid crystal SLM is an effective active beam shaping device through adjusting each pixel transmittance to improve the spatial beam quality of the output laser, which can also be used as a binary optical element (BOE) with each pixel transmittance 0 or 1 to realize spatial beam shaping for high-power lasers. We present and demonstrate an efficient shaping method of the SLM used as BOE based on diffraction principle. The method can be used to control the output nearfield actively by compensating the spatial nonuniformity of transmission and amplification in the high power laser system. Results show the output nearfield beam quality improves significantly after shaping by using this method with the fluence contrast changing from 22% to 11.3% within only 2 shots in the single-shot operation laser. Copyright © 2019 SPIE.

关键词： High power lasers

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Widely Tunable Middle Infrared optical Parametric Oscillator Pumped by the Q-Switched Ho：GdVO_4 Laser

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Chinese Physics Letters 2018年第5期35卷 48-51页

作者： Xiao-Ming Duan Cheng Chen Yu Ding Bao-Quan Yao Yue-Zhu Wang National Key Laboratory of Tunable Laser Technology Harbin Institute of Technology Harbin 150001 Science and Technology on Electro-Optical Information Security Control Laboratory Tianjin 300308

We demonstrate a middle infrared ZnGeP_2 optical parametric oscillator pumped by the Q-switched Ho：GdVO_4 laser. When the incident Ho pump power is 4.12 W, the maximum average output power of the ZGP-OPO laser is 2.05 W, corresponding to a slope efficiency of 74.6%. The ZGP-OPO laser produces 4.2 ns mid-infrared pulses at a pulse repetition rate of 5 kHz. In addition, we obtain 0.8 um of tunable range for the signal wave and 2.1 um of tunable range for the idler wave.

关键词： Ho OPO Widely Tunable Middle Infrared optical Parametric Oscillator Pumped by the Q-Switched Ho:GdVO4 Laser

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Theoretical analysis of a polarized two-photon michelson interferometer with broadband chaotic light

arXiv

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arXiv 2021年

作者： Zhou, Yu Luo, Sheng Liu, Jianbin Zheng, Huaibin Chen, Hui He, Yuchen Liu, Yanyan Li, Fuli Xu, Zhuo MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter Department of Applied Physics Xi'An Jiaotong University Shaanxi Xi'an710049 China Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education International Center for Dielectric Research School of Electronic Science and Engineering Xi'An Jiaotong University Shaanxi Xi'an710049 China Science and Technology on Electro-Optical Information Security Control Laboratory Tianjin300308 China

In this paper, we study two-photon interference of broadband chaotic light in a Michelson interferometer with two-photon-absorption detector. The theoretical analysis is based on two-photon interference and Feynman path integral theory. The two-photon coherence matrix is introduced to calculate the second-order interference pattern with polarizations being taken into account. Our study shows that the polarization is another dimension, as well as time and space, to tune the interference pattern in the two-photon interference process. It can act as a switch to manipulate the interference process and open the gate to many new experimental schemes. Copyright © 2021, The Authors. All rights reserved.

关键词： Michelson interferometers

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Nth-order nonlinear intensity fluctuation amplifier

arXiv

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arXiv 2021年

作者： Zhang, Shuanghao Zheng, Huaibin Wang, Gao Chen, Hui Liu, Jianbin Zhou, Yu He, Yuchen Luo, Sheng Liu, Yanyan Xu, Zhuo Key Laboratory of Multifunctional Materials and Structures Ministry of Education School of Electronic Science and Engineering Xi'An Jiaotong University Shaanxi Xi'an710049 China Science and Technology on Electro-Optical Information Security Control Laboratory Tianjin300308 China School of Physics & Astronomy University of Glasgow GlasgowG12 8QQ United Kingdom MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter Department of Applied Physics Xi'An Jiaotong University Xi'an710049 China

Stronger light intensity uctuations are pursued by related applications such as optical resolution, image enhancement, and beam positioning. In this paper, an Nth-order light intensity uctuation amplifier is proposed, which was demonstrated by a four-wave mixing process with different statistical distribution coupling lights. Firstly, its amplification mechanism is revealed both theoretically and experimentally. The ratio R of statistical distributions and the degree of second-order coherence g(2)(0) of beams are used to characterize the affected modulations and the increased light intensity uctuations through the four-wave mixing process. The results show that the amplification of light intensity uctuations is caused by not only the uctuating light fields of incident coupling beams, but also the uctuating nonlinear coefficient of interaction. At last, we highlight the potentiality of applying such amplifier to other N-order nonlinear optical effects. Copyright © 2021, The Authors. All rights reserved.

关键词： Image enhancement

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Object Detection Based On Decision Level Fusion

Object Detection Based On Decision Level Fusion

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Chinese Automation Congress (CAC)

作者： Jun Yao Yong Zhang Fang Liu Yi-cong Liu College of Science Shengyang Ligong University Shenyang China Science and Technology on Electro-Optical Information Security Control Laboratory Tianjing China School of Automation and Electrical Engineering Shengyang Ligong University Shenyang China

Object detection is widely used in different fields. In this paper, a new object detection model of decision level fusion based on Mask R-CNN is proposed. The model fuses the infrared images and the visible images at decision-making level. It is called as IVF-Mask R-CNN. In order to improve the stability and the accuracy of the IVF-Mask R-CNN model, the partial network freeze strategy, learning rate reduction strategy and test image up-sizing strategy are used. The fuse model IVF-Mask R-CNN compensates the limitation of single imaging model of object detection. It improves the accuracy of the detection. The experimental results show that IVF-Mask R-CNN model contributes to a better object detection effect compared with the single visible detection model and the infrared detection model.

关键词： Object detection Training Feature extraction Imaging Head Convolution Classification algorithms

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Object Detection Based on Improved YOLOv3-tiny

Object Detection Based on Improved YOLOv3-tiny

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Chinese Automation Congress (CAC)

作者： Hua Gong Hui Li Ke Xu Yong Zhang College of Science Shengyang Ligong University Shenyang China School of Automation and Electrical Engineering Shengyang Ligong University Shenyang China Science and Technology on Electro-Optical Information Security Control Laboratory Tianjing China

Deep learning has gradually become the mainstream object detection algorithm because of its powerful feature extraction ability and adaptive ability. However, how to guarantee the accuracy and speed is still a huge challenge in the field of object detection. This paper proposes an improved YOLOv3-tiny for object detection based on the idea of feature fusion. YOLOv3-tiny is chosen as the basic network framework to ensure the identification speed. In order to improve the poor detection accuracy of YOLOv3-tiny network, feature fusion is carried out based on Feature Pyramid Network. The last DBL (Darknetconv2d_ Batch Normalization_Leaky) output of the second scale output layer is fused with the fourth DBL output of the network. And a 52$\times$ 52 scale output is added on the basis of the original network. Experiments were carried out on our dataset. The experimental results show that compared with YOLOv3-tiny, the accuracy of the improved network structure is increased by 6.3%, and the detection speed is 31.8fps, ensuring the requirements of real-time detection.

关键词： Feature extraction Object detection Real-time systems Training Convolution Microprocessors Computer architecture

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