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design of a compact wide-band triple grating imaging spectrometer based on freeform surfaces

APPLIED OPTICS 2024年第17期63卷 4643-4650页

作者： Chen, Jianjun Wang, Linlin Huo, Limin Kuang, Cuifang Mao, Lei Tan, Mingyue Shao, Mingwei Yin, Lu Qingdao Univ Technol Sch Informat & Control Engn Qingdao 266520 Shandong Peoples R China Zhejiang Univ Coll Opt Sci & Engn Hangzhou 310027 Zhejiang Peoples R China Ningbo Yongxin Opt Co Ltd Ningbo 315040 Zhejiang Peoples R China China Jiliang Univ Coll Opt & Elect Technol Hangzhou 310018 Zhejiang Peoples R China

Wide -band, high spectral resolution, and miniaturized imaging spectrometers have important applications. However, the working band, spectral resolution, and volume of the imaging spectrometers are mutually restricted. To solve this problem, we proposed a method in which multiple working bands share the same optical components except gratings, and the working bands switch with the switching of the working gratings. Based on the freeform surfaces characterized by XY polynomials, we designed a compact wide -band triple grating imaging spectrometer through the design ideas of human -computer interaction and iterative optimization. The imaging spectrometer works in the wavelength band of 200 nm ti 1600 nm, covering ultraviolet (UV), visible, and near -infrared light, and it has a compact optical path volume of 24 mm x 38 mm x 80 mm. Three gratings with 0.0025 mm, 0.005 mm, and 0.01 mm line spacing are used to realize dispersion with high diffraction efficiency in the bands of 200 nm ti 400 nm, 400 nm ti 800 nm, and 800 nm ti 1600 nm, respectively. The UV detector receives imaging light in the UV band (200 nm ti 400 nm), and the visible near -infrared (VNIR) detector receives imaging light in the visible and near -infrared bands (400 nm ti 1600 nm). The design results show that the spectral resolutions of the three bands are 0.4 nm, 0.8 nm, and 1.6 nm, and the spectral smile and keystone distortion are less than 1.4 mu m. The design results have engineering application value. (c) 2024 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.

关键词： Diffraction efficiency Freeform surfaces optical components optical design software optical systems systems design

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Implementation of the design for manufacturability of spaceborne telescope for remote sensing instruments in the FORMOSA-8 satellite program 6

Implementation of the design for manufacturability of spaceb...

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Earth Observing Missions and Sensors: Development, Implementation, and Characterization vi 2024

作者： Lin, Sheng-Feng Taiwan Space Agency Hsinchu Science Park 8 F 9 Prosperity 1st Road Hsinchu300091 Taiwan

ISBN: (数字)9781510682771

ISBN: (纸本)9781510682764

This paper presents the implementation of the design for manufacturability (DfM) methodologies and considerations in the development of a spaceborne telescope designed for remote sensing instruments (RSI) as part of the FORMOSA-8 satellite program. The study focuses on optimizing the telescope design to balance optical performance with limitations of manufacturability and challenges of specification constraints. A critical aspect of this process involves conducting a detailed tolerance sensitivity analysis across various system aperture sizes and ensuring traceability in measuring the performance of assembling and aligning lens elements. This approach evaluates the impact on key performance metrics, including wave front error (WFE), modulation transfer function (MTF), and the alignment performance of optical components. The methodologies developed were applied to the FORMOSA-8X satellite constellation, resulting in significant improvements during the assembly, integration, and testing (AIT) phases. The successful design balances manufacturability and performance, achieving the desired outcomes in the first iteration as result in doing design right the first time. Additionally, this paper explores the trade-offs encountered during the design process and offers recommendations for optimizing DfM in spaceborne telescopes. The paper also details the development of a spaceborne Ritchey-Chrétien telescope with corrector lens design, emphasizing the challenges related to specification requirements, the manufacturing process, and innovative solutions employed. The key factors, such as tolerance sensitivity, alignment accuracy, and environmental considerations, are addressed. The implications of these trade-offs design methodologies for future spaceborne catadioptric optical systems are discussed, including a review of the telescope's integration and testing for the FORMOSA-8X satellite program. © 2025 SPIE.

关键词： design for manufacturability

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Optomechanical system design under road vibration conditions

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PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNAL OF AUTOMOBILE engineering 2023年第7期237卷 1765-1772页

作者： Sag, Doga Can Erol, Haluk Gursoy, Irmak Kayasal, Ugur Roketsan Missiles Ind Inc Ankara Turkey Istanbul Tech Univ Mech Engn Fac TR-34439 Istanbul Turkey

Optomechanical systems used in vehicles or moving platforms are exposed to vibration loads from road effects. This study investigated the dynamic behavior of an optomechanical system exposed to random vibrations. Random vibration analysis and laboratory tests of the system were performed with the MIL-STD-810 test method standard. The relative displacements of two lenses in the optomechanical system were obtained under vibration loads by using the finite element (FE) method. The displacements were examined by tests. The obtained relative displacements of the lenses were used as input to the optical analysis and the laser spot position was obtained. The obtained spot positions were evaluated comparatively with the tests. The optical analysis results were consistent with the tests. Using the verified FE and optical models, structural modifications were made in the basic design. Five different design changes were examined. The natural frequencies and the mass of the entire system and the relative displacements of the lenses were obtained for comparative evaluation. Finally, the optimum design minimally affected by vibration loads was achieved.

关键词： Vehicle control systems vehicle engineering vehicle safety systems active safety systems automotive components

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Spatial resolution limit for a solid immersion lens

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APPLIED OPTICS 2024年第30期63卷 7893-7899页

作者： Zhelnov, Vladislav A. Ulitko, Vladislav E. Skorobogatiy, Maksim Zaytsev, Kirill I. Chernomyrdin, Nikita, V Russian Acad Sci Prokhorov Gen Phys Inst Moscow 119991 Russia Polytech Montreal Dept Engn Phys Montreal PQ H3C 3A7 Canada

The solid immersion (SI) effect is widely used to increase the spatial resolution of optical focusing systems and even overcome the Abbe diffraction limit. Resolution enhancement offered by a SI lens is mostly a function of its geometry and refractive index nSI. While SI lenses are relatively well understood, the scaling of the resolution enhancement by such lenses is still a subject of debate, with some works reporting <^>nSI and <^>n2SI dependencies for the hemispherical and hyperhemispherical SI lens configurations, respectively. In this paper, we offer a general argument for a resolution limit for SI optics and, then, verify it via the numerical analysis of the hemispherical and hyperhemispherical silicon SI lenses designed for the terahertz (THz) range. In fact, we find that there is no contradiction in the reported resolution enhancements <^>nSI and <^>n2SI;however, they happen in different operation regimes. We then demonstrate that the resolution values reported for the different SI lens arrangements in the visible (viS), near-, and middle-infrared (NIR and MIR), as well as THz bands obey the derived limit. Our findings will be useful for the further design and applications of SI optics. (c) 2024 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.

关键词： Diffraction limit Lens design optical elements optical systems Spatial resolution systems design

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All-optical high-contrast femtosecond switching using nonlinearity from an epsilon-near-zero effect in plasmonic metamaterials

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OPTICS LETTERS 2024年第9期49卷 2397-2400页

作者： Bhowmik, Tanmay Chakraborty, Bodhan Sikdar, Debabrata Indian Inst Technol Guwahati Dept Elect & Elect Engn Gauhati 781039 Assam India Nanyang Technol Univ Sch Phys & Math Sci Singapore Singapore

Metamaterials opened a new realm to control light-matter interactions at sub -wavelength scale by engineering metaatoms. Recently, the integration of several emerging nonlinear materials with metamaterial structures enables ultrafast all -optical switching at the nanoscale and thus brings enormous possibilities to realize next -generation optical communication systems. This Letter presents a novel, to the best of our knowledge, design of plasmonic metamaterials for high -contrast femtosecond all -optical switching. We leverage magnetic plasmon (MP) resonance combined with the nonlinear effects of an epsilon -near -zero (ENZ)-material. The proposed design comprises a periodic array of two closely spaced Au-nanogratings deposited on an optically thick Au -substrate to excite MP -resonance. To enable a dynamically tunable resonance, the nanogrooves in meta -atoms are filled with an ENZ-material, cadmium -oxide (CdO). The intraband transition -induced optical nonlinearities in the ENZ-medium are studied using a two -temperature model. The MP -resonance ensures strong light-matter interactions enabling enhancement of the nonlinearities of the proposed structure. We observe that the pump -induced refractive index change in the CdO layer causes a redshift of the MP -resonance dip wavelength in the reflectance spectrum, leading to a high modulation depth of 0.83 at 1.55 mu m. With an ultra -fast response time of 776 fs while maintaining a low pump-fluence of 75 mu J/cm 2 , the proposed metamaterial could help in realizing switches for next -generation optical computation systems. (c) 2024 Optica Publishing Group

关键词： Effective refractive index Light matter interactions Nonlinear effects optical systems Refractive index Transparent conducting oxides

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Smartphone-based optical sectioning (SOS) microscopy with a telecentric design for fluorescence imaging

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JOURNAL OF MICROSCOPY 2024年第1期296卷 10-23页

作者： Jiao, Ziao Pan, Mingliang Yousaf, Khadija Doveiko, Daniel Maclean, Michelle Griffin, David Chen, Yu Li, David Day Uei Univ Strathclyde Dept Biomed Engn Glasgow G1 1XQ Scotland Univ Strathclyde Strathclyde Inst Pharm & Biomed Sci Glasgow Scotland Univ Strathclyde Dept Phys Glasgow Scotland Univ Strathclyde Dept Elect & Elect Engn Robertson Trust Lab Elect Sterilisat Technol ROLES Glasgow Scotland

We propose a smartphone-based optical sectioning (SOS) microscope based on the HiLo technique, with a single smartphone replacing a high-cost illumination source and a camera sensor. We built our SOS with off-the-shelf optical, mechanical cage systems with 3D-printed adapters to seamlessly integrate the smartphone with the SOS main body. The liquid light guide can be integrated with the adapter, guiding the smartphone's LED light to the digital mirror device (DMD) with neglectable loss. We used an electrically tuneable lens (ETL) instead of a mechanical translation stage to realise low-cost axial scanning. The ETL was conjugated to the objective lens's back pupil plane (BPP) to construct a telecentric design by a 4f configuration to maintain the lateral magnification for different axial positions. SOS has a 571.5 mu m telecentric scanning range and an 11.7 mu m axial resolution. The broadband smartphone LED torch can effectively excite fluorescent polystyrene (PS) beads. We successfully used SOS for high-contrast fluorescent PS beads imaging with different wavelengths and optical sectioning imaging of multilayer fluorescent PS beads. To our knowledge, the proposed SOS is the first smartphone-based HiLo optical sectioning microscopy (1965) pound, which can save around 7035 pound compared with a traditional HiLo system (9000) pound. It is a powerful tool for biomedical research in resource-limited areas.

关键词： HiLo microscopy optical sectioning microscopy smartphone microscopy

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Resonant Beam Communications:A New design Paradigm and Challenges

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Journal of Communications and Information Networks 2024年第1期9卷 80-87页

作者： Yuanming Tian Dongxu Li Chuan Huang Qingwen Liu Shengli Zhou Future Network of Intelligence Institute and School of Science and Engineering the Chinese University of Hong KongShenzhen 518172China School of Science and Engineering and the Future Network of Intelligence Institute the Chinese University of Hong KongShenzhen 518172China College of Electronics and Information Engineering Tongji UniversityShanghai 201804China Department of Electrical and Computer Engineering University of ConnecticutStorrsCT 06250USA

Resonant beam communications (RBCom), which adopts oscillating photons between two separate retroreflectors for information transmission, exhibits potential advantages over other types of wireless optical communications (WOC). However, echo interference generated by the modulated beam reflected from the receiver affects the transmission of the desired information. To tackle this challenge, a synchronization-based point-to-point RBCom system is proposed to eliminate the echo interference, and the design for the transmitter and receiver is discussed. Subsequently,the performance of the proposed RBCom is evaluated and compared with that of visible light communications(VLC)and free space optical communications (FOC). Finally, future research directions are outlined and several implementation challenges of RBCom systems are highlighted.

关键词： resonant beam communications(RBCom) wireless optical communications(WOC) echo interference elimination mobility multiple access

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Comparing reflected and emitted radiometric signal levels in short-wave infrared, extended short-wave infrared, mid-wave infrared, and superband (short-wave infrared through mid-wave infrared) optical systems

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optical engineering 2025年第2期64卷

作者： Somerville, Luke Leslie, Patrick Jordan, Shane Renshaw, Kyle Driggers, Ron Univ Arizona Wyant Coll Opt Sci Tucson AZ 85721 USA Univ Cent Florida Ctr Res & Educ Opt & Lasers Orlando FL USA

With the improvement of infrared detector technology over the last several decades, traditional design trades regarding the use of different wavebands in optical systems are becoming less and less applicable. Current detector technology is allowing for extended and even bridged wavebands, where previous detectors were limited to only a single waveband. These bridged waveband cameras, or superband cameras, contain detectors with response over large spectral spans, allowing them to take advantage of the unique properties of multiple wavebands. This type of system is especially of interest when the superband contains both the short-wave infrared (SWIR) waveband-where most of the signal comes from reflected light- to mid-wave infrared (MWIR) waveband-where most of the signal comes from emitted light. Such a superband system allows the combination of reflected and emitted light on a single detector, opening different system-level optical design trades across many fields and disciplines. Presented is a comparison of reflected and emitted radiometric signal levels for four filtered wavebands using a 1.5- to 5.4-mu m superband imaging system: (1) with a 1.9-mu m SWIR short-pass filter, (2) with a 2- to 2.5-mu m extended SWIR (eSWIR) bandpass filter, (3) with a 3-mu m MWIR long-pass filter, and (4) with no filter (i.e., full superband response). The comparison in each of the four wavebands is repeated under four solar illumination conditions: full daylight, clouds, dusk, and night. (c) 2025 Society of Photo-optical Instrumentation Engineers (SPIE)

关键词： superband radiometry infrared emitted light reflected light targeting

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Earth Observing Missions and Sensors: Development, Implementation, and Characterization vi

Earth Observing Missions and Sensors: Development, Implement...

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Earth Observing Missions and Sensors: Development, Implementation, and Characterization vi 2024

ISBN: (纸本)9781510682764

The proceedings contain 29 papers. The topics discussed include: evaluation of GPM DPR rain parameters with north Taiwan disdrometers;tracking MODIS RVS for the reflective solar bands in drifting orbits using SNO with viIRS;PACE OCI straylight and crosstalk evaluation using moon;optical metrology for wide field-of-view remote sensing systems;design and simulation of plenoptic imaging system on unmanned aerial vehicle for 3D aerial photography;design and implementation of automatic optical surface defect inspection system of large aperture lenses;optical thermal vacuum test for the FORMOSAT-8 optical system assembly;and implementation and investigation of motion simulation and compensation for airborne synthetic aperture radar.

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Codebook design for SCMA-Assisted visible Light Communication With Shot Noise

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IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2025年第1期74卷 1753-1758页

作者： Gui, Yiming Liu, Zilong Luo, Qu Yu, Lisu He, Ziming Xiao, Pei Xihua Univ Chengdu 610039 Peoples R China Univ Essex Sch Comp Sci & Elect Engn Colchester CO4 3SQ England Univ Surrey Inst Commun Guildford England Nanchang Univ Sch Informat Engn Nanchang 330031 Peoples R China Samsung Elect Samsung Cambridge Solut Ctr Syst LSI Cambridge CB4 0DS England

This paper studies the codebook design for sparse code multiple access (SCMA) based visible light communication (VLC) impaired by shot noise. By focusing on the typical Rician fading channels, we first derive a lower bound of the mutual information of VLC with shot noise and present a design metric called minimum normalized Euclidean distance (MNED). We then propose a novel codebook design approach for VLC including novel non-linear compensation (NLC) constellation and power scheduling matrix under the non-negative and real constraint. Simulation results demonstrate that our proposed codebook design leads to a higher MNED and thus significantly improved bit error performance over the existing SCMA codebooks for VLC systems.

关键词： Noise visible light communication optical transmitters Light emitting diodes NOMA optical receivers optical noise Sparse code multiple access (SCMA) visible light communication (VLC) shot noise minimum normalized Euclidean distance (MNED)

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