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electro-optical and infrared systems: technology and applications XXI 2024

ISBN: (纸本)9781510681088

The proceedings contain 47 papers. The topics discussed include: disruptive imaging field trial (DRIFT) on computational and compressive imaging systems;analysis of surface currents in pBpn superlattice infrared detectors;high-quality factor mid-wave infrared metasurface for methane detection applications;immersive situational awareness and seeing through occlusions at thermal infrared wavelengths;LWIR radiometric signature measurement using micro-bolometer imaging sensors;target tracking in a complex simulated world;optical correction of microscan distortion;development of a sensor hardened against laser damage independent of wavelength by off-focus imaging;design and development of an integrated LiDAR sensor for autonomous driving – achieved results;and active shortwave infrared pushbroom imager for security and defense applications.

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electro-optical and infrared systems: technology and applications XX

Electro-Optical and Infrared Systems: Technology and Applica...

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electro-optical and infrared systems: technology and applications XX 2023

ISBN: (纸本)9781510667037

The proceedings contain 30 papers. The topics discussed include: design of an imaging system for turbulence mitigation using phase diversity;the practicalities of a spatial coherence filter in free-space LIDAR environments;development of a long wave infrared photonic doppler velocimeter;design of a single optical bench for complete performance characterization of night vision device;simulation of a tomographic single-pixel imager using rosette scanning;thermal imagers with boost: range prediction with the Johnson criteria;impact of motion blur on recognition rates of CNN-based TOD classifier models;error analysis of a multi-sensor maritime targeting system;and data gathering trials for the development of military imaging systems.

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electro-optical and infrared systems: technology and applications XIX

Electro-Optical and Infrared Systems: Technology and Applica...

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electro-optical and infrared systems: technology and applications XIX 2022

ISBN: (纸本)9781510655454

The proceedings contain 20 papers. The topics discussed include: single-photon infrared waveguide-based upconversion imaging;mid-infrared (longwave infrared) passive spectroscopic imaging with an uncooled microbolometer array sensor;a scenario-based approach for the evaluation of video object tracking algorithms’ performance;field validation of a mobile detection system for laser scattering measurements in the NIR range;SIMTAD: a simulation tool for evaluating target detection performance of imaging systems;prototype measurement setup to assess near-eye display imaging quality: an update;microbolometer compatible metamaterial absorber for multispectral imaging;and comparison of algorithms for contrast enhancement based on TOD assessments by convolutional neural networks.

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Wideband and low-spurious optical waveform generator for optically addressable quantum systems manipulation and control

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OPTICS EXPRESS 2024年第12期32卷 20992-21006页

作者： Welinski, Sacha Beattie, Eduardo Ulrich, Lothaire Wengerowsky, Soeren De Riedmatten, Hugues Morvan, Loic Berger, Perrine Thales Res & Technol F-91767 Palaiseau France ICFO Barcelona Inst Sci & Technol Inst Ciencies Foton Castelldefels 08860 Barcelona Spain Univ PSL Inst Langevin ESPCI Paris CNRS F-75005 Paris France ICREA Inst Catalana Recerca & Estudis Avant Ats Barcelona 08015 Spain

optical manipulation of quantum systems requires stable laser sources able to produce complex waveforms over a large frequency range. In the visible region, such waveforms can be generated using an acousto-optic modulator driven by an arbitrary waveform generator, but these suffer from a limited tuning range typically of a few tens of MHz. Visible -range electro-optic modulators are an alternative option offering a larger modulation bandwidth, however they have limited output power which drastically restricts the scalability of quantum applications. There is currently no architecture able to perform phase -stabilized waveforms over several GHz in the visible or near infrared region while providing sufficient optical power for quantum applications. Here we propose and develop a modulation and frequency conversion set-up able to deliver optical waveforms over a large frequency range, with a high spurious extinction ratio, scalable to the entire visible/near infrared region with high optical power. The optical waveforms are first generated at telecom wavelength and then converted to the emitter wavelength through a sum frequency generation process. By adapting the pump laser frequency, the optical waveforms can be tuned to interact with a broad range of optical quantum emitters or qubits such as alkali atoms, trapped ions, rare earth ions, or fluorescent defects in solid-state matrices. Using this architecture, we were able to detect and study a single erbium ion in a nanoparticle. We also generated high bandwidth signals at 606 nm, which would enable frequency multiplexing of on -demand read-out Pr 3 + :Y 2 SiO 5 quantum memories. (c) 2024 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

关键词： Frequency modulation Laser sources Near infrared Phase modulation Sum frequency generation Tunable diode lasers

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Latest development on IR detector technology at WAT-VIGO laboratory 21

Latest development on IR detector technology at WAT-VIGO lab...

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electro-optical and infrared systems: technology and applications XXI 2024

作者： Kopytko, Malgorzata Sobieski, Jan Dąbrowski, Karol Gawron, Waldemar Piotrowski, Józef Institute of Applied Physics’ Military University of Technology 2. Kaliskiego St.’ Warsaw00-908 Poland Vigo Photonics S.A.’ 129/133 Poznańska St.’ Mazowiecki’ 05-850 Poland

ISBN: (纸本)9781510681088

The aim of the paper is to review the main achievements in the research of HgCdTe ternary alloy and InAs/InAsSb type-ii superlattice material to indicate the Polish contribution to the development of medium and long wavelength infrared photodetectors. Research and development efforts in the WAT-VIGO joint laboratory have focused on the metal-organic chemical vapor deposition (from 2003) and molecular beam epitaxy (from 2015). At present stage of development’ the photoconductive and photovoltaic HgCdTe detectors are gradually replaced with novel device designs based on iiI-V material system. T2SL devices complement the offer of MCT ones in applications where it is necessary to ensure’ among others: higher resistance to difficult operating conditions and high uniformity of parameters of multi-element detectors. © 2024 SPIE.

关键词： Molecular beam epitaxy

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Comparison of plane-to-sky contrast and detection range performance in the visible, short-wave infrared, mid-wave infrared, and long-wave infrared bands

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APPLIED OPTICS 2024年第19期63卷 5088-5098页

作者： Cavanaugh, Richard Jordan, Shane Rubis, Jordan Ledbetter, Jamie Driggers, Ronald Univ Arizona Wyant Coll Opt Sci Infrared Syst Grp Tucson AZ 85721 USA

Recent advances in uncrewed aerial vehicle (UAV) technology have the potential to benefit diverse civil, commercial, scientific, and defense projects. Many applications would benefit from beyond visual line-of-sight (BVLOS) operations. Such operations require automated safety systems that allow uncrewed aircraft to avoid collisions with both crewed and uncrewed aircraft. electro-optical and infrared (EO/IR) sensors are commonly employed by aircraft collision avoidance systems. This study compares plane-to-sky contrast in the VIS (0.4 to 0.7 mu m), SWIR (1 to 1.7 mu m), MWIR (3 to 5 mu m), mu m), and LWIR (8 to 14 mu m) to determine which band is most sensitive to an aircraft signal against a clear sky background. Contrast in the two reflective bands ( VIS and SWIR) is determined in terms of equivalent reflectivity, and contrast in the two emissive bands (MWIR and LWIR) is determined in terms of equivalent blackbody temperature. Sensitivity data are then used alongside resolution specifications to estimate the detection performance at-range using the night vision integrated performance model (NVIPM). The results are extrapolated to a maritime atmosphere using MODTRAN. An analysis of the range performance and recommendations on band selection are provided for reference in the design of EO/IR systems for aircraft collision avoidance. Future research may study the band performance at night and against other backgrounds (e.g. clouds, ocean, ground terrain). (c) 2024 Optica Publishing Group

关键词： Detector arrays infrared detectors infrared sensors Night vision Remote sensing systems design

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electro-optical and infrared systems: technology and applications XViiI and electro-optical Remote Sensing XV

Electro-Optical and Infrared Systems: Technology and Applica...

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electro-optical and infrared systems: technology and applications XViiI and electro-optical Remote Sensing XV 2021

ISBN: (纸本)9781510645769

The proceedings contain 29 papers. The topics discussed include: radio communication system with а high degree of protection of information against non-allowed access;reconstruction of compressed sensing Raman imaging using machine learning;improving the accuracy of combining pairs of thermal images based on the analysis of visual information;imager performance assessment with TRM4 version 3: an overview;a standard target for triangles or how to transfer TOD to MTDP;target detection: the transition from unresolved to extended targets;towards atmospheric turbulence simulation using a conditional variational autoencoder;and turbulence simulation for anisoplanatic imaging based on phase screens with experimental validation of differential tilt variances.

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Ni2+activated broadband near-infrared ii germanate phosphor for pc-LED applications

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JOURNAL OF ALLOYS AND COMPOUNDS 2024年 1003卷

作者： Fang, Limin Lu, Liping Zhang, Liangliang Wu, Hao Wu, Huajun Pan, Guohui Hao, Zhendong Zhang, Jiahua Changchun Univ Sci & Technol Sch Mat Sci & Engn Changchun 130022 Peoples R China Chinese Acad Sci Key Lab Luminescence Sci & Technol Changchun 130033 Peoples R China Chinese Acad Sci Changchun Inst Opt Fine Mech & Phys State Key Lab Luminescence Sci & Technol Changchun 130033 Peoples R China Univ Chinese Acad Sci Ctr Mat Sci & Optoelect Engn Beijing 100049 Peoples R China

The broadband near-infrared (NIR) pc-LED is considered as a new generation of light source for substance measurements based on NIR spectroscopy. The most studied Cr3+ doped broadband NIR phosphors emit in the near-infrared I region. However, there is a demand for broadband near-infrared ii solid-state light sources for expanding the variety of detected substances. Herein, Ni2+ activated NIR ii Mg14Ge5O24 phosphor is synthesized by high-temperature solid-state method. The phosphor shows a asymmetric broad NIR emission band peaked at 1420 nm, that is assigned to the 3T2(3F)-> 3A2(3F) transition of Ni2+. It is observed that the asymmetric emission band is contributed from two Ni2+ centers, Ni2+(I) and Ni2+(ii), occupying Ge4+ site with the emission peaked at 1313 nm and Mg2+ site with the emission peaked at 1435 nm, respectively. It is found that the addition of Ti4+ and B3+ can significantly change the intensity ratio of the two Ni2+ centers and enhance the overall emission intensity. Moreover, the addition of Mn4+ results in only Ni2+(ii) emission. The origin of the unique features mentioned above is discussed. The temperature dependence of the NIR emissions is also studied. Finally a broadband NIR ii pc-LED with a moderate electro-optical conversion efficiency of 1.4 % is fabricated based on a 400 nm LED chip. The results indicate that the modified Mg14Ge5O24:Ni2+ is a potential broadband NIR ii phosphor for pc-LED applications.

关键词： Broadband near-infrared Luminescence Ni 2+ Phosphors pc-LED

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All-optical perception based on partially coherent optical neural networks

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OPTICS EXPRESS 2025年第2期33卷 1609-1624页

作者： Chen, Rui Ma, Yijun Zhang, Chuang Xu, Wenjun Wang, Zhong Sun, Shengli Chinese Acad Sci Shanghai Inst Tech Phys Shanghai 200083 Peoples R China Univ Chinese Acad Sci Sch Elect Elect & Commun Engn Beijing 100049 Peoples R China Chinese Acad Sci Key Lab Intelligent Infrared Percept Shanghai 200083 Peoples R China

In the field of image processing, optical neural networks offer advantages such as high speed, high throughput, and low energy consumption. However, most existing coherent optical neural networks (CONN) rely on coherent light sources to establish transmission models. The use of laser inputs and electro-optic modulation devices at the front end of these neural networks diminishes their computational capability and energy efficiency, thereby limiting their practical applications in object detection tasks. This paper proposes a partially coherent optical neural network (PCONN) transmission model based on mutual intensity modulation. This model does not depend on coherent light source inputs or active electro-optic modulation devices, allowing it to directly compute and infer using natural light after simple filtering, thus achieving full optical perception from light signal acquisition to computation and inference. Simulation results indicate that the model achieves a highest classification accuracy of 96.80% and 86.77% on the MNIST and Fashion-MNIST datasets, respectively. In a binary classification simulation test based on the ISDD segmentation dataset, the model attained an accuracy of 94.69%. It is estimated that this system's computational inference speed for object detection tasks is 100 times faster than that of traditional CONN, with energy efficiency approximately 50 times greater. In summary, our proposed PCONN model addresses the limitations of conventional optical neural networks in coherent light environments and is anticipated to find applications in practical object detection scenarios. (c) 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

关键词： High throughput optics Huygens Fresnel principle Information processing optical computing optical neural systems Point spread function

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Radiation thermometer using a MWIR detector for room temperature measurement 21

Radiation thermometer using a MWIR detector for room tempera...

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electro-optical and infrared systems: technology and applications XXI 2024

作者： Do Lim, Sun Cha, DongHwan Seo, Doo Shun Park, Seongchong Korea Research Institute of Standards and Science DaeJeon34113 Korea Republic of Korea Aerospace Research Institute DaeJeon34113 Korea Republic of

ISBN: (纸本)9781510681088

We introduce a radiation thermometer using a mid-wave infrared detector for observing ground target emissivity at room temperature. Key to accurate temperature measurement lies in detecting low signals reliably, requiring internal thermal equilibrium and the use of lock-in detection to amplify signals. Multiple temperature controls and an optimally placed optical chopper enable this precision. This presentation will also cover some of our works regarding Mid-IR ground reference targets. © 2024 SPIE.

关键词： infrared radiation

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