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Conference on current developments in Lens design and optical engineering XX

作者： Huang, Jiun-Woei Taiwan Instrument Res Inst Natl Appl Labs 20 R&D 6 Rd Hsinchu 30076 Taiwan Natl Taiwan Univ Inst Appl Mech 1 Roosevelt Rd4 Sec Taipei 10617 Taiwan

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629028

The design of four mirrors anti-astigmatism astronomical telescope is carried out for low earth orbit satellite. By integrating with Cassagrain and Schwartzschild configurations, the telescope is design. It contains four mirrors with conic surface, to form an aberration free. The system contains two parts: first part is the Cassagrain type telescope for pick up the ground object to the stop position, and the second part is Schwartzschild configurations as relay optics, which is to relay the image to high resolution CCD sensor to provide 0.5 ground space distance image. The system is symmetric with aberration free within a one cubic size fitted for small satellite. The optic mechanical is simple easy to assemble for optical calibration, while the body is rigid in space.

关键词： four mirrors anti-astigmatism astronomical telescope small satellite

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Introducing a dynamic deep neural network to infer lens design starting points 20

Introducing a dynamic deep neural network to infer lens desi...

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Conference on current developments in Lens design and optical engineering XX

作者： Cote, Geoffroi Lalonde, Jean-Francois Thibault, Simon Univ Laval Ctr Opt Photon & Laser Quebec City PQ G1V 0A6 Canada Univ Laval Lab Vis & Syst Numer Quebec City PQ G1V 0A6 Canada

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629028

Most lens design problems involve the time-consuming task of finding a proper starting point, that is, a lens design that approximately fulfills the desired first-order specifications while decently correcting aberrations. In recent work, a fully-connected (FC) deep neural network was trained to learn this task by extrapolating from known lens design databases. Here, we introduce a new dynamic neural-network architecture for the starting point problem which is based on a recurrent neural network (RNN) architecture. As we show, the dynamic network can learn to infer good starting points on many lens design structures at once whereas the previous model was limited to a given sequence of glass elements and air gaps. We also show that a pretrained RNN model can generalize its knowledge over new lens design structures for which we have no reference lens design and obtain a significantly better optical performance than a RNN trained from scratch.

关键词： Manuscript format template SPIE Proceedings LaTeX

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Lighting design of an indoor sports field 20

Lighting design of an indoor sports field

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current developments in Lens design and optical engineering XX 2019

作者： Lee, Xuan-Hao Lin, Shih-Kang Yu, Yeh-Wei Yang, Tsung-Hsun Sun, Ching-Cherng Department of Optics and Photonics National Central University Taoyuan City32001 Taiwan Department of Optics and Photonics Feng Chia University Taichung City40724 Taiwan

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629011

In this paper, an efficient lighting design for indoor sport field is presented. The average illuminance for the indoor sport field with eight playing courts can be achieve to 500 lx at a 11.2 m of the lamp's mounting height. Besides, because of specific arrangement of luminaires, the proposed lighting design can effectively reduced the glare effect and provide a comfortable illumination to players. © 2019 SPIE.

关键词： Light emitting diodes

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optical Systems for Large-aperture Phased Laser Array Including Diffractive Optics 20

Optical Systems for Large-aperture Phased Laser Array Includ...

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Conference on current developments in Lens design and optical engineering XX

作者： Erlikhman, Jacob Krogen, Peter Srinivasan, Prashant Hettel, Will Meinhold, Peter Lubin, Philip Univ Calif Santa Barbara Dept Phys Broida Hall Santa Barbara CA 93106 USA

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629028

Directed energy propulsion for interstellar travel has been proposed as an ideal method for reaching appreciable speeds relative to the speed of light: 0.2c. However, the amount of energy required necessitates a large aperture, on the order of kilometers, while mitigation of atmospheric perturbations requires a discretization of the aperture into many individual laser elements. The use of fiber lasers for these elements obligates mode-matching the fiber to the desired 10 cm aperture for a collimated beam. Various collimation systems were designed and compared. A 3-lens system with one achromat and two aspheric lenses, with two of the lenses used as a Keplerian telescope to achieve a system-shortening effect was analyzed. A similar system made with a plano-convex lens replacing the large-aperture aspheric lens with two additional compensating lenses was compared. A single diffractive optic operating at F/8 was likewise considered. The optical performance of these systems was compared, as was the cost-effectiveness. Scalability to millions of elements was required, so cost-per-system was a crucial consideration factor. Possible manufacturing processes for a diffractive system were investigated, and stamping processes for replication were analyzed to determine the possibility of replication of such an optic reliably, cheaply, and with acceptable results.

关键词： Directed energy optical design diffractive optical elements corrective optical elements laser propulsion

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原子芯片的基本原理、关键技术及研究进展

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物理学报 2021年第2期70卷 50-69页

作者：李沫陈飞良罗小嘉杨丽君张健电子科技大学电子科学与工程学院成都611731 中国工程物理研究院电子工程研究所绵阳621999

飞速发展的激光冷却、囚禁与操控中性原子的理论和实验技术不仅促进了人们对微观物质运动规律的认知,而且在精密测量和量子信息领域催生了多项颠覆性的器件与应用.不同于传统复杂庞大的原子光学实验装置,原子芯片通过在硅等基底上制备... 详细信息

飞速发展的激光冷却、囚禁与操控中性原子的理论和实验技术不仅促进了人们对微观物质运动规律的认知,而且在精密测量和量子信息领域催生了多项颠覆性的器件与应用.不同于传统复杂庞大的原子光学实验装置,原子芯片通过在硅等基底上制备的表面微纳结构或器件来精准控制磁场、电场或光场,从而在小尺度、低功耗条件下实现对原子的强束缚与相干操控,被认为是一种稳定、精确、功能及扩展性强大的原子及其量子态片上实验平台,具有广泛且重大的应用价值.本文首先简要回顾了原子芯片的发展历程,然后介绍了基于载流导线的微势阱及微导引实现原子芯片的基本原理,并着重讨论了基于载流导线的原子芯片制备技术、测试方法和集成的全链条关键实现技术.随后,本文综述了各国与原子芯片相关的研究计划布局和主要应用进展,指出原子芯片走向实用面临的挑战性问题,并对其未来发展进行了展望.

关键词：原子芯片原子磁导引冷原子原子光学

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Gas sensing spectroscopy system utilizing a sample grating distributed feedback quantum cascade laser array and type ii superlattice detector 17

Gas sensing spectroscopy system utilizing a sample grating d...

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Quantum Sensing and Nano Electronics and Photonics XVii 2020

作者： Coirier, Nathaniel R. Gomez-Patron, Andrea I. Razeghi, Manijeh Center for Quantum Devices Northwestern University EvanstonIL United States

ISBN: (纸本)9781510633391

Gas spectroscopy is a tool that can be used in a variety of applications. One example is in the medical field, where it can diagnose patients by detecting biomarkers in breath, and another is in the security field, where it can safely alert personnel about ambient concentrations of dangerous gas. In this paper, we document the design and construction of a system compact enough to be easily deployable in defense, healthcare, and chemical safety environments. current gas sensing systems use basic quantum cascade lasers (QCLs) or distributed feedback quantum cascade lasers (DFB QCLs) with large benchtop signal recovery systems to determine gas concentrations. There are significant issues with these setups, namely the lack of laser tunability and the lack of practicality outside of a very clean lab setting. QCLs are advantageous for gas sensing purposes because they are the most efficient lasers at the mid infrared region (MIR). This is necessary since gases tend to have stronger absorption lines in the MIR range than in the near-infrared (NIR) region. To incorporate the efficiency of a QCL with wide tuning capabilities in the MIR region, sampled grating distributed feedback (SGDFB) QCLs are the answer as they have produced systems that are widely tunable, which is advantageous for scanning a robust and complete absorption spectrum. The system employs a SGDFB QCL array emitter, a Type ii InAsSb Superlattice detector receiver, a gas cell, and a cooling system. © 2020 SPIE.

关键词： Quantum cascade lasers

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Biomimetics: Nature‐Inspired design and Innovation 1

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2020年

作者： Sandy B. Primrose

ISBN: (数字)9781119683360

ISBN: (纸本)9781119683322

Provides a professional, contemporary, and concise review of the current knowledge and advances in biomimetics This book covers the field of biomimicry, an area of science where researchers look to mimic aspects of plants or animals in order to solve problems in aerospace, shipping, building, electronics, and optics, among others. It presents the latest developments in biomimicry and gives readers sufficient grounding to help them understand the current, and sometimes technically complex, research literature. Different themes are covered throughout and text boxes deal with the relevant physics for readers who may lack this knowledge. Biomimetics: Nature-Inspired design and Innovation examines issues in fluid dynamics such as avoiding sonic booms, reducing train noise, increasing wind turbine efficiency, and more. Next, it looks at optical applications, e.g. how nature generates color without dyes and pigment, and how animals stay cool in desert environments. A chapter on the built environment discusses cooling systems for buildings based on termite mounds; creating self-cleaning paint based on lotus leaves; unobtrusive solar panels based on ivy; and buildings that respond to the environment. Two more sections focus on biomimicry for the creation of smart materials and smart devices. The book finishes with a look at the field’s future over the next decade. Presents each topic in sufficient detail in order to enable the reader to comprehend the original scientific papers Emphasizes those examples of biomimicry that have made it into products Features text boxes that provide information on the relevant physics or engineering principles for biologists who do not have a physics background Covers the scientific literature up to July 2019 Biomimetics: Nature-Inspired design and Innovation is an excellent book for senior undergraduates and post-graduate students in the life sciences, material sciences, and bioengineering. It will also appeal to lay readers with an interest

关键词： cell \u0026 molecular biology

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Key Challenges and Results in the design of Cubesat Laser Terminals, optical Heads and Coarse Pointing Assemblies

Key Challenges and Results in the Design of Cubesat Laser Te...

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IEEE International Conference on Space optical Systems and Applications (IEEE ICSOS)

作者： Dresscher, M. Korevaar, C. W. van der Valk, N. C. J. de Lange, T. J. Saathof, R. Doelman, N. Crowcombe, W. E. Duque, C. M. de Man, H. Human, J. D. Witvoet, G. van der Heiden, N. den Breeje, R. Kuiper, S. Fritz, E. C. TNO Tech Sci Stieltjesweg 1 NL-2628 CK Delft Netherlands

ISBN: (纸本)9781728105000

The anticipated capacity benefit of optical satellite communications has triggered a cascade of technology developments. In this paper, we present three such technologies, namely;i). A cube satellite laser terminal (CubeCAT), ii). A lower Earth orbit satellite optical head (LEOCAT) and iii). A calibration and verification test bench for coarse pointing assemblies, named pointing test bench (PTB). For these technologies, pointing stability and accuracy are central challenges. For i) and ii), we discuss anticipated effects of the thermal and mechanical disturbances that threaten the optical alignment of the system. We furthermore explain the mitigation of these effects through the system design so that a high optical performance can be maintained. For iii), we discuss the mechanical design challenges, in combination with modelling and calibration procedures for the system. Effective dealing with the three of them in turn enables highly accurate mirror orientation and rotation. design specifications and current status are presented for each system.

关键词： Free space optical communications laser communication terminal laser satellite communications low earth orbit satellite smallsat cubesat optical head coarse-pointing assembly ground-support equipment.

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Freeform Optics design of Primary Lens for Uniform Irradiance Distribution of Concentrator Photovoltaic System 20

Freeform Optics Design of Primary Lens for Uniform Irradianc...

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Conference on current developments in Lens design and optical engineering XX

作者： Pham Thanh Tuan Duy, N. N. Vu Ngoc Hai Shin, Seoyong Myongji Univ Dept Informat & Commun Engn Gyeonggi Do 17058 South Korea Vietnam Acad Sci & Technol Inst Appl Mat Sci Ho Chi Minh City 70072 Vietnam Phenikaa Univ Elect & Elect Engn Hanoi 1000 Vietnam Duy Tan Univ Fac Nat Sci Danang 550000 Vietnam

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629028

In this paper, a primary lens of concentrator photovoltaic (CPV) system is designed by using freeform optics. The designed lens is constructed based on a basic idea of a combination of Fresnel lens and freeform optics, in which the lens is divided into an array of sub-lenses, which are designed using the conservation of optical path length and the edge ray theorem to get uniform irradiance distribution over the receiver. In this design, every sub-lens is designed to guide the direct sunlight over the receiver with uniform irradiance so that the whole of the primary lens will converge uniformly the direct sunlight over the receiver. The structure of the lens is designed firstly by using Matlab program for every sublens. The Matlab data of the designed lens structure is then used to build the three-dimensional (3D) lens in LightTools (TM) software. The ray tracing technique in LightTools (TM) software is used to find out the optimum structure of the freeform lens. Furthermore, the simulation is performed to estimate the efficiency of the lens as a concentrator of a CPV system by using the light source with the sunlight spectrum. The designed lens can achieve high geometrical concentration ratio and uniform irradiance distribution over the receiver. The simulation results show that the lens can easily reach a high concentration ratio (494 times) with uniform irradiance distribution and good optical efficiency (86%).

关键词： Concentrator photovoltaic (CPV) Primary lens Freeform optics Sub-lenses array Uniform irradiance distribution

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Exposure of Restore-L Camera optical Elements to a Simulated Orbital Radiation Environment 20

Exposure of Restore-L Camera Optical Elements to a Simulated...

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Conference on current developments in Lens design and optical engineering XX

作者： Miller, Kevin H. Heaney, James B. Lauenstein, Jean-Marie Brown, Stephen K. O'Connor, Kenneth M. Miller, Sharon K. NASA Goddard Space Flight Ctr 8800 Greenbelt Rd Greenbelt MD 20771 USA SGT KBR 7701 Greenbelt Rd Ste 400 Greenbelt MD 20770 USA NASA Glenn Res Ctr 21000 Brookpark Rd Cleveland OH 44135 USA

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629028

This paper reports on the exposure of visible wavelength camera optical elements to a simulated orbital radiation environment in support of the Restore-L flight project at NASA's Goddard Space Flight Center. Borosilicate glasses with various metal oxide dopants - S-LAL8, S-LAL18, N-SF1, and the polycarbonate material Makrolon GP were exposed to electrons and protons of varying energies. Low energy (E <= 10keV) charged particles were used primarily to assess degradation to the antireflective coatings of the optical elements. High energy (E similar to 1 MeV) charged particles were used to evaluate degradation to the bulk material. Elements of S-LAL18, N-SF1, LaK9G15, and Makrolon GP were exposed to a representative atomic oxygen rich environment. Elements of S-LAL8 and Makrolon GP were exposed to intense ultraviolet radiation. Pre- and post-exposure transmittance measurements were used to quantify the effects on the elements tested in the simulated environment over the 0.3 to 1.2 micron wavelength range. Our measurement results will be discussed in the context of their robustness to the orbital environment and the known chemical constituents of the materials tested.

关键词： Restore-L radiation anti-reflective coating transmittance atomic oxygen ultraviolet

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