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arXiv 2025年

作者： Lin, Jadon Y. de Sterke, C. Martijn Ilic, Ognjen Kuhlmey, Boris T. School of Physics The University of Sydney SydneyNSW2006 Australia Institute of Photonics and Optical Science The University of Sydney SydneyNSW2006 Australia Department of Mechanical Engineering University of Minnesota MinneapolisMN55455 United States The University of Sydney Nano Institute The University of Sydney SydneyNSW2006 Australia

Lightsails are a highly promising spacecraft concept that has attracted interest in recent years due to its potential to travel at near-relativistic speeds. Such speeds, which current conventional crafts cannot reach, offer tantalizing opportunities to probe nearby stellar systems within a human lifetime. Recent advancements in photonics and metamaterials have created novel solutions to challenges in propulsion and stability facing lightsail missions. This review introduces the physical principles underpinning lightsail spacecrafts and discusses how photonics coupled with inverse design substantially enhance lightsail performance compared to plain reflectors. These developments pave the way through a previously inaccessible frontier of space exploration. © 2025, CC BY.

关键词： Space research

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AEOLUS-2 mission pre-development status 25

AEOLUS-2 mission pre-development status

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Sensors, Systems, and Next-Generation Satellites XXV 2021

作者： Heliere, Arnaud Wernham, Denny Mason, Graeme Straume, Anne Grete Noordwijk Netherlands

ISBN: (数字)9781510645615

ISBN: (纸本)9781510645608

This paper will describe the current status of instrument pre-development activities that are being performed in the frame of a potential Aeolus Follow-On mission (Aeolus-2). The main inputs for a future Doppler Wind Lidar (DWL) instrument that have been used are: lessons learned from the Aeolus development phases and the in-orbit operations and performance;initial inputs from EUMETSAT including a total mission lifetime of 10-15 years utilizing 2-3 spacecraft with a launch of the first satellite in 2029, increased robustness and operability of the instrument, and an emphasis on reduction of recurrent costs;the maximum utilization of the demonstrated design heritage;and a number of recommendations for the requirements of a future DWL mission from the Aeolus Scientific Advisory Group. These inputs have been collated and combined into a set of preliminary requirements which have been used as the basis for a dedicated Instrument Consolidation Study. The aim of the study is to adapt the design (taking account of the heritage retention principle), in order to improve the performance of the instrument for the Aeolus follow-on mission. In addition, three instrument subsystem pre-development activities have been kicked-off: two laser transmitter engineering model pre-developments aiming at increasing the output energy level up to 150mJ in UV and the robustness of the laser transmitter and the pre-development of an improved detector with better vertical sampling. These developments have the aim to demonstrate that issues identified from the above are resolved and that the technology levels are sufficiently mature for the follow-on DWL mission. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： optical radar

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Advances in selective laser sintering of polymers

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International Journal of Extreme Manufacturing 2022年第4期4卷 20-56页

作者： Wei Han Lingbao Kong Min Xu Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing Department of Optical Science and EngineeringFudan UniversityShanghai 200433People’s Republic of China

Polymers are widely used materials in aerospace,automotive,construction,medical devices and *** are being promoted rapidly due to their ease of manufacturing and improved material *** on polymer processing technology should be paid more attention to due to the increasing demand for polymer *** laser sintering(SLS)uses a laser to sinter powdered materials(typical polyamide),and it is one of the critical additive manufacturing(AM)techniques of *** irradiates the laser beam on the defined areas by a computer-aided design three-dimensional(3D)model to bind the material together to create a designed 3D solid *** has many advantages,such as no support structures and excellent mechanical properties resembling injection moulded parts compared with other AM ***,the ability of SLS to process polymers is still affected by some defects,such as the porous structure and limited available types of SLS ***,this article reviews the current state-of-the-art SLS of polymers,including the fundamental principles in this technique,the SLS developments of typical polymers,and the essential process parameters in ***,the applications of SLS are focused,and the conclusions and perspectives are discussed.

关键词： selective laser sintering additive manufacturing laser powder bed fusion 3D printing polymer

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Quantitative Predictions of Moisture-Driven Photoemission Dynamics in Metal Halide Perovskites via Machine Learning

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JOURNAL OF PHYSICAL CHEMISTRY LETTERS 2022年第9期13卷 2254-2263页

作者： Howard, John M. Wang, Qiong Srivastava, Meghna Gong, Tao Lee, Erica Abate, Antonio Leite, Marina S. Univ Maryland Dept Mat Sci & Engn College Pk MD 20742 USA Univ Maryland Inst Res Elect & Appl Phys College Pk MD 20742 USA Helmholtz Zentrum Berlin Mat & Energie Young Investigator Grp Act Mat & Interfaces Stabl D-12489 Berlin Germany Univ Calif Davis Dept Mat Sci & Engn Davis CA 95616 USA Univ Calif Davis Dept Elect & Comp Engn Davis CA 95616 USA Univ Naples Federico II Dept Chem Mat & Prod Engn I-80125 Naples Italy

Metal halide perovskite (MHP) photovoltaics may become a viable alternative to standard Si-based technologies, but the current lack of long-term stability precludes their commercial adoption. Exposure to standard operational stressors (light, temperature, bias, oxygen, and water) often instigate optical and electronic dynamics, calling for a systematic investigation into MHP photophysical processes and the development of quantitative models for their prediction. We resolve the moisture-driven light emission dynamics for both methylammonium lead tribromide and triiodide thin films as a function of relative humidity (rH). With the humidity and photoluminescence time series, we train recurrent neural networks and establish their ability to quantitatively predict the path of future light emission with 18% error over 4 h. Together, our in situ rH-PL measurements and machine learning forecasting models provide a framework for the rational design of future stable perovskite devices and, thus, a faster transition toward commercial applications.

关键词： Degradation Light Humidity Perovskites Materials

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Comparison of passive athermalization results of LWIR optical designs utilizing different infrared optical materials 11

Comparison of passive athermalization results of LWIR optica...

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Conference on current developments in Lens design and optical engineering XXI

作者： Kucukcelebi, Doruk Sakarya, Dogan Ugur Kemalpasa Mahallesi Sehit Yuzbasi Adem Kutlu TR-06780 Ankara Turkey

ISBN: (数字)9781510637719

ISBN: (纸本)9781510637719

In this paper, different optical designs, which are composed of different LWIR optical materials, are utilized for passive athermalization and their performance in athermalization are analyzed. The optical designs are carried out by preserving the athermal property as well as keeping the image quality at higher levels within the working temperature between -40 degrees C and +60 degrees C. Our designs consist of two different infrared optical elements to maintain the focus positions as stable as possible within the working temperature. The passive athermalization process begins with the calculation of athermalization conditions of candidate material properties. By taking into account these conditions, athermal material pairs are chosen. The optical design begins with an optimization process using paraxial optics. In order to reduce aberrations such as coma, astigmatism, spherical and chromatic, aspherical surfaces are utilized during the optimization process. At the end of the design phase, the performance of different configurations of athermal optical material pairs, which are enclosed by aluminum alloy housing material, are presented.

关键词： Athermalization infrared optical design two-element optical material pair Long Wave Infrared (LWIR)

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The entrance pupil of an on-axis stigmatic singlet lens 11

The entrance pupil of an on-axis stigmatic singlet lens

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Conference on current developments in Lens design and optical engineering XXI

作者： Gonzalez-Acuna, Rafael G. Gutierrez-Vega, Julio C. Tecnol Monterrey Photon & Math Opt Grp Monterrey 64849 Mexico

We derive a closed-form expression for the entrance pupil of the on-axis stigmatic singlet lens, and discuss its performance for a variety of conditions, including positive or negative indices of refraction, and diffe... 详细信息

ISBN: (数字)9781510637719

ISBN: (纸本)9781510637719

关键词： optical design spherical aberration telescopes aberration theory

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optical design of triple-mode seeker 11

Optical design of triple-mode seeker

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Conference on current developments in Lens design and optical engineering XXI

作者： Sakarya, Dogan Ugur Kucukcelebi, Doruk Tact Missile Syst Grp TR-06780 Roketsan Elmadag Ankara Turkey

ISBN: (数字)9781510637719

ISBN: (纸本)9781510637719

In missile applications, new counter measure methods are getting more complex. To discriminate and detect counter measure and to understand target signature from scene is getting harder. Because of all that concerns, using triple-mode seeker for a system solution is a good solution for system total performance. By this way, tri-different wavelength could be used for same system and same scene. In this study, triple mode system's optical designs have been made for mid-wave infra-red imaging, long-wave infra-red imaging and short-wave infrared imaging. optical designs performances have been illustrated in simulation results. Finally, conceptual design of triple mode seeker will be summarized.

关键词： Triple mode seeker mid wave infrared long wave infrared short wave infrared optical design

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Optimization of a mobile phone camera for as-built performance 11

Optimization of a mobile phone camera for as-built performan...

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Conference on current developments in Lens design and optical engineering XXI

作者： Joo, Joonha Alisafaee, Hossein Rose Hulman Inst Technol Dept Phys & Opt Engn 5500 Wabash Ave Terre Haute IN 47803 USA

ISBN: (数字)9781510637719

ISBN: (纸本)9781510637719

The work presented here shows a compact lens system that demonstrates improved imaging quality performance while focusing on as-built performance and design for manufacturing. Using Zemax, we consider an approach for optimizing for as-built performance and incorporate the approach into the design process for a mobile phone camera. The optimized design consists of 6 plastic aspheric lenses, an infrared glass filter, and a 12 MP CMOS image sensor. The optical system demonstrates high-resolution imaging and has a field-of-view of 87.6 degrees, an F-number of 2.0, a maximum distortion of less than 2.5%, and a total track length of 6.630 mm.

关键词： optical design Optimization Tolerancing design for manufacturing Zemax

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design of an anastigmatic three-mirror telescope using freeform surfaces 11

Design of an anastigmatic three-mirror telescope using freef...

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Conference on current developments in Lens design and optical engineering XXI

作者： Alvarado-Martinez, J. J. Granados-Agustin, F. S. Vazquez-y Montiel, S. Cornejo-Rodriguez, A. A. INAOE Luis Enrique Erro 1 Sta Maria Tonanzintla Cholula Pue Mexico UIEPA Los Ilanos Kilometro 1 San Andres Tlayehualanci Ahuacatlan Pue Mexico

ISBN: (数字)9781510637719

ISBN: (纸本)9781510637719

This paper proposes the design of an anastigmatic three-mirror telescope using freeform surfaces for the correction of spherical aberration, coma, astigmatism, and field curvature, allowing a wide field of view (FOV) and high resolution. For the structure of this telescope, it is proposed to use only two optical elements where the primary and tertiary mirrors are integrated into an only optical element and the secondary mirror in the other, thus achieving a considerable reduction in the difficulty of alignment and assembly. To achieve a high performance of the telescope, the system was decentered (off-axis design), avoiding the loss of energy due to the obscuration of the M-2 in the on-axis system. In addition, to solve the difficult access to the focus.

关键词： optical design three-mirror system freeform on-axis system off-axis system

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Distortion controlled optical design using orthogonal surface polynomials 11

Distortion controlled optical design using orthogonal surfac...

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Conference on current developments in Lens design and optical engineering XXI

作者： Allain, Guillaume Thibault, Simon Ctr Opt Photon & Laser Quebec City PQ Canada Univ Laval Dept Phys Genie Phys & Opt Quebec City PQ Canada

ISBN: (数字)9781510637719

ISBN: (纸本)9781510637719

The design of high quality very wide-angle optical systems (FFOV > 100 degrees) relies on distortion to obtain a sufficient resolution at, usually, the center of the field of view. Using distortion shape as a parameter during optimization to reach a magnification target is a common technique to achieve optical foveation during the lens design process. This method allows resolution enhancement at selected parts of the field of view since less care is given to parts of the image that are deemed less important. However, accurate control of distortion can be a challenge during optical design since the standard aspherics polynomials don't correlate directly to image magnification. This may in fact slow down optimization since the merit function is much less optimized to approach a solution. In this paper, we address this problem by presenting a method to simplify distortion control during the optical design phase. To achieve this, the use of orthogonal polynomials is used for defining the optical surface shape and will then be used to compare the height of the image plane at a given field of view. We show that in the case of simple and paraxial system, this process is orthogonal and achieve a solution in a single optimization step. We will finally discuss the limits of this method and how it applies to modern lens design problems.

关键词： optical design Foveated imaging Distortion Control Orthogonal polynomials Shape specification

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