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Imaging Quality Analysis based on High-order Aspheric Lens 3

Imaging Quality Analysis Based on High-order Aspheric Lens

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3rd International conference on optics and Machine Vision, ICOMV 2024

作者： Li, Yingchun Li, xin Sun, Jiangbo Li, Jixiang Wang, Zenglu Zhang, Yaoyao Changchun University of Technology Changchun130012 China Jilin Communications Polytechnic Changchun China

ISBN: (纸本)9781510680319

Aiming at the optical design of free-form surface can effectively reduce the size of systemic structure and improve the imaging quality. Through the modulation transfer function diagram and point diagram, the rationality and superiority of the high-order aspheric lens design of the complex optical-mechanical system of aerial camera are analyzed. based on the surface shape error caused by free-form surface optical elements in machining, the effects of surface error of free-form surface optical elements on the optical performance of complex optical-mechanical system are studied by ray tracing and wavefront fitting, and the influence law is revealed. © 2024 SPIE.

关键词： Optical transfer function

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Reference surface self-calibration stitching algorithm based on Legendre polynomials for testing synchrotron radiation flat mirrors 8

Reference surface self-calibration stitching algorithm based...

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8th Asia Pacific conference on optics Manufacture, APCOM 2023 and 3rd International Forum of Young Scientists on Advanced Optical Manufacturing, YSAOM 2023

作者： Liu, Yong Gao, xibo Hu, Zubo xue, Shuai Chen, Shanyong Huang, Cheng Du, Chunyang Hu, Hao Dai, Yifan Peng, xiaoqiang Wang, Linfeng College of Intelligence Science and Technology National University of Defense Technology Changsha Hunan410073 China Hunan Key Laboratory of Ultra-Precision Machining Technology Changsha Hunan410073 China Laboratory of Science and Technology on Integrated Logistics Support National University of Defense Technology Changsha Hunan410073 China State Key of High Performance Complex Manufacturing Central South University Changsha Hunan410073 China

ISBN: (纸本)9781510672673

x-ray mirrors play a critical role in transmitting and focusing beams in advanced light source devices like synchrotron radiation (SR) and free electron laser (FEL) light sources. The Root-Mean-Square (RMS) value of surface shape accuracy required for these mirrors is typically sub-micro radian/sub-nanometer, and their aperture can be hundreds of millimeters or even meters. To achieve this accuracy, deterministic figuring is required and surface figure error is the premise. Interferometric stitching test is commonly utilized. However, interferometric test obtains the surface figure error relative to the reference surface. To obtain the absolute surface figure error of x-ray mirrors, it is crucial to obtain the surface figure error of the reference surface before or during stitching measurement and separate it from the stitching result. To achieve this, a reference surface self-calibration interferometric stitching algorithm based on Legendre polynomial fitting is reported. The algorithm fits the reference surface by orthogonal Legendre polynomials in the rectangular domain, and the polynomial coefficients are expressed as interlocking terms in the stitching algorithm. The fitting coefficients are optimized and fitted together with the free compensation terms, i. *** translation and tilt terms. The paper established the theoretical model of the algorithm and conducted simulations on an x-ray mirror with a length of 300 mm. A two dimensional stitching interferometry device was built. An x-ray mirror with a length of 300 mm was tested utilizing the proposed method. The short-Term repeatability was preliminarily analyzed. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Synchrotron radiation

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Addressing Calibration of High Harmonic Generation sources used for Studying Magnetism 18

Addressing Calibration of High Harmonic Generation Sources u...

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advances in x-ray/EUV optics and Components xVIII 2023

作者： Buckway, Taylor J. Redd, Aaron Lewis, Devin Gullikson, Eric Vawdrey, Joshua Chesnel, Karine Allred, David Sandberg, Richard L. Department of Physics and Astronomy Brigham Young University N269 Eyring Science Center Provo United States Lawrence Berkeley National Laboratory 1 Cyclotron Rd Berkeley United States

ISBN: (纸本)9781510666023

Tabletop extreme ultraviolet (EUV) sources based on high harmonic generation (HHG) have been used as a powerful tool for probing magnetism. Obtaining magnetic information via magneto-optical contrast often requires the energy of the light to be tuned to magnetic resonance energies of the magnetic element present in the material;therefore, it is essential to calibrate the HHG spectrum to well defined absorption energies of materials. We have designed and assembled a HHG based EUV source for studying transition metal magnetic materials at their resonant M-absorption edges (35-75 eV of photon energy). One material of interest is iron, for which the iron M2,3 edge is 52.7 eV (23.5 nm wavelength) according to CxRO. We prepared and characterized a thin sample of iron for absorption spectroscopy and calibration of the absorption edge with beamline 6.3.2 at the Advance Light Source (ALS) in Lawrence Berkeley National laboratory. This well characterized sample was capped with gold to prevent oxidation. From these measurements we extracted the absorption part of the index of refraction β spectrally and confirmed that the absorption edge of iron is 52.7 eV. With this information, we can better calibrate the HHG spectrum of our tabletop EUV source. Calibration of the HHG spectrum was achieved using model fitting the HHG spectrum using the grating equation and law of cosines while taking account into the results of the ALS data. We have determined that driving wavelength of the HHG process to be 773 nm. We also conclude that the chirp of the driving laser pulse can cause an energy shift to a HHG spectrum. © 2023 SPIE.

关键词： Iron

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Spatial reconstruction from temporal light field: A new approach for optical 3D metrology 8

Spatial reconstruction from temporal light field: A new appr...

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8th Asia Pacific conference on optics Manufacture, APCOM 2023 and 3rd International Forum of Young Scientists on Advanced Optical Manufacturing, YSAOM 2023

作者： Tang, xinlan Kong, Lingbao Shanghai Engineering Research Center of Ultra-precision Optical Manufacturing School of Information Science and Technology Fudan University Shanghai China

ISBN: (纸本)9781510672673

With the advances in scientific foundations and technological implementations, modern industrial design requires more details of object such as 3D information. Most of the optical 3D metrology focus on the spatial distribution of the light field, while weakening its temporal characteristics, which makes additional information lost or causes errors in somewhere. Here, we propose a new approach based on the temporal modulated radiation, actively introduce time perturbation and mine the hidden information in the temporal domain intensity fluctuations of the light field. A temporal cross-correlation function is used to calculate and characterize the related physical quantities of temporal light field, modeling the mapping relationship between the phase gradient of the modulated wave and the gradient of the object surface, and the feasibility of the model is verified by numerical simulation based on ray-Tracing method. The proposed approach expands a new perceptive for optical metrology, provides a bridge for the integration of various technologies. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Numerical methods

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Development of Wolter-I x-ray focusing mirrors measurement device 8

Development of Wolter-I x-ray focusing mirrors measurement d...

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8th Asia Pacific conference on optics Manufacture, APCOM 2023 and 3rd International Forum of Young Scientists on Advanced Optical Manufacturing, YSAOM 2023

作者： Liao, Qiuyan xue, Jiadai Ding, Fei Bao, xingyu Wu, Kaiji Gu, Dongyun Zhang, Zhichao Chen, Zhigao Li, Duo Wang, Bo Yang, Yanji Chen, Yong College of Mechanical Engineering Harbin Institute of Technology Harbin150001 China Key Laboratory for Particle Astro Institute of High Energy Physics Chinese Academy of Sciences Beijing10049 China

ISBN: (纸本)9781510672673

EP satellite is a scientific exploration satellite for time-domain astronomy and high-energy astrophysics, its function is to carry out high-energy transitory celestial body survey with the highest sensitivity in the soft x-ray band. EP will be equipped with two groups of x-rays focusing mirrors (each group contains 54 Wolter-I mirrors). An x-ray focusing mirror is used to collect x-ray radiation in the universe, and is the core component of an x-ray astronomical satellite observation payload. The current x-ray focusing mirrors are derived from the Wolter-I reflector, and the light is focused through the inner surface. The inner reflection surface is an optical free-form surface connected by parabolic and hyperbolic surfaces. Many conventional measurement methods are not applicable and difficult to measure. High precision contact measurement is easy to scratch the mirror surface, Therefore, noncontact measurement must be used. In this paper, we develop two non-contact surface precision measurement devices are developed to solve the problem of difficult measurement of the inner reflection surface of the x-ray focusing mirror. One is a rapid measurement device based on the principle of optical star measurement method, The other is to measure the mirror inner surface by a single point scan measurement, the optical triangulation method is selected as the principle of the measurement device. We then verified the measurement accuracy of the mirrors with a precision visible light test system. In order to further verify the measurement accuracy of the focusing mirrors, x-ray testing of the focusing mirror was carried out at the 100-meter vacuum x-ray calibration facility of the Institute of High Energy Physics, Chinese Academy of Sciences. The x-ray measurement results are better than the project index requirements. © COPYRIGHT SPIE.

关键词： Astrophysics

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Sparse Matrix-based HPC Tomography 20th

Sparse Matrix-Based HPC Tomography

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20th Annual International conference on Computational Science (ICCS)

作者： Marchesini, Stefano Trivedi, Anuradha Enfedaque, Pablo Perciano, Talita Parkinson, Dilworth Sigray Inc 5750 Imhoff DrSte 1 Concord CA 94520 USA Virginia Polytech Inst & State Univ Blacksburg VA 24061 USA Lawrence Berkeley Natl Lab Computat Res Div 1 Cyclotron Rd Berkeley CA 94720 USA Lawrence Berkeley Natl Lab Adv Light Source 1 Cyclotron Rd Berkeley CA 94720 USA

ISBN: (纸本)9783030503710;9783030503703

Tomographic imaging has benefited from advances in x-ray sources, detectors and optics to enable novel observations in science, engineering and medicine. These advances have come with a dramatic increase of input data in the form of faster frame rates, larger fields of view or higher resolution, so high performance solutions are currently widely used for analysis. Tomographic instruments can vary significantly from one to another, including the hardware employed for reconstruction: from single CPU workstations to large scale hybrid CPU/GPU supercomputers. Flexibility on the software interfaces and reconstruction engines are also highly valued to allow for easy development and prototyping. This paper presents a novel software framework for tomographic analysis that tackles all aforementioned requirements. The proposed solution capitalizes on the increased performance of sparse matrix-vector multiplication and exploits multi-CPU and GPU reconstruction over MPI. The solution is implemented in Python and relies on CuPy for fast GPU operators and CUDA kernel integration, and on SciPy for CPU sparse matrix computation. As opposed to previous tomography solutions that are tailor-made for specific use cases or hardware, the proposed software is designed to provide flexible, portable and high-performance operators that can be used for continuous integration at different production environments, but also for prototyping new experimental settings or for algorithmic development. The experimental results demonstrate how our implementation can even outperform state-of-the-art software packages used at advanced x-ray sources worldwide.

关键词： Tomography SpMV x-ray imaging HPC GPU

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Distributed Quantitative Vibration Demodulation with Direct-detection based Phase-sensitive OTDR Assisted by Acousto-optic Phase Shifting Technique 19

Distributed Quantitative Vibration Demodulation with Direct-...

引用

19th International conference on Optical Communications and Networks, ICOCN 2021

作者： Liu, Shuaiqi Yu, Feihong xu, Weijie Vai, Mang I. Shao, Liyang Department of Electrical and Electronic Engineering Southern University of Science and Technology Shenzhen China State Key Laboratory of Analog and Mixed-Signal VLSI University of Macau China

ISBN: (纸本)9781665424462

Quantitative demodulation of the external vibration is demonstrated with a direct-detection based Phase-sensitive OTDR system. An acousto-optic modulator is utilized for both probe pulse generation, and optical phase shifting simultaneously. The fiber under test is probed with a phase shifted double pulse pair scheme, with the phase difference between the two pulses periodically shifted with a π/2 step. The optical phase information is retrieved using the homodyne inter-pulse interference signal with direct detection only. Experimental results show good consistence between the phase demodulation result and the applied vibration amplitude under a cost-effective system configuration. © 2021 IEEE.

关键词： Demodulation

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Transfer of autocollimator calibration for use with scanning gantry profilometers for accurate determination of surface slope and curvature of state-of-the-art x-ray mirrors 8

Transfer of autocollimator calibration for use with scanning...

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conference on advances in Metrology for x-ray and EUV optics VIII

作者： Lacey, Ian Anderson, Kevan Dickert, Jeff Geckler, Ralf D. Just, Andreas Siewert, Frank Smith, Brian V. Yashchuk, Valeriy V. Lawrence Berkeley Natl Lab 1 Cyclotron Rd Berkeley CA 94720 USA Physikalisch Techn Bundesanstalt Bundesallee 100 D-38116 Braunschweig Germany Helmholtz Zentrum Berlin Mat & Energie Dept Opt & Beamlines Albert Einstein Str 15 D-12489 Berlin Germany

ISBN: (数字)9781510629127

ISBN: (纸本)9781510629127

x-ray optics, desired for beamlines at free-electron-laser and diffraction-limited-storage-ring x-ray light sources, must have almost perfect surfaces, capable of delivering light to experiments without significant degradation of brightness and coherence. To accurately characterize such optics at an optical metrology lab, two basic types of surface slope profilometers are used: the long trace profilers (LTPs) and nanometer optical measuring (NOM) like angular deflectometers, based on electronic autocollimator (AC) ELCOMAT-3000. The inherent systematic errors of the instrument's optical sensors set the principle limit to their measuring performance. Where autocollimator of a NOM-like profiler may be calibrated at a unique dedicated facility, this is for a particular configuration of distance, aperture size, and angular range that does not always match the exact use in a scanning measurement with the profiler. Here we discuss the developed methodology, experimental set-up, and numerical methods of transferring the calibration of one reference AC to the scanning AC of the Optical Surface Measuring System (OSMS), recently brought to operation at the ALS xray optics laboratory. We show that precision calibration of the OSMS performed in three steps, allows us to provide high confidence and accuracy low-spatial-frequency metrology and not 'print into' measurements the inherent systematic error of tool in use. With the examples of the OSMS measurements with a state-of-the-art x-ray aspherical mirror, available from one of the most advanced vendors of x-ray optics, we demonstrate the high efficacy of the developed calibration procedure. The results of our work are important for obtaining high reliability data, needed for sophisticated numerical simulations of beamline performance and optimization of beamline usage of the optics. This work was supported by the U. S. Department of Energy under contract number DE-AC02-05CH11231.

关键词： synchrotron radiation error suppression calibration metrology of x-ray optics surface metrology profilometry DLSR FEL

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Strip-based parallel beam projection model for under-sampling CT system 3

Strip-based parallel beam projection model for under-samplin...

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3rd International conference on Photonics and Optical Engineering

作者： Zhang, Shuang Wang, Jinbang Mei, Hanxue Zhou, Peng Pan, Kai Liu, Zhiguo Li, Yude Sun, Tianxi College of Nuclear Science and Technology Beijing Normal University Beijing100875 China Beijing Key Laboratory of Applied Optics Beijing100875 China Key Laboratory of Beam Technology Ministry of Education Beijing100875 China Beijing Radiation Center Beijing100875 China

ISBN: (数字)9781510627802

ISBN: (纸本)9781510627796

x ray CT is a vital technology for inspecting the internal structure of some objects. Various computing method models have been used to CT reconstruction. When image of the scanned object is recorded by the detector unit of finite area, the strip-based projection model is more suitable. In this paper, a simultaneous algebraic reconstruction technique (SART) for strip-based parallel beam projection model have been adopted. Furthermore, in order to reduce the radiation dose and avoid the blurring effect resulting from changes in physical and chemical properties of specimens during scanning, it is necessary to reduce the number of step-scanning. This algorithm combined with cubic spline interpolation can reconstruct high quality CT images in a small amount of data projection in numerical simulation. © 2019 SPIE.

关键词： Image reconstruction

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Osiris-rex navigation small force models

Osiris-rex navigation small force models

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AAS/AIAA Astrodynamics Specialist conference, 2019

作者： Geeraert, Jeroen L. Leonard, Jason M. Kenneally, Patrick W. Antreasian, Peter G. Moreau, Michael C. Lauretta, Dante S. Simi ValleyCA93065 United States Colorado Center for Astrodynamics Research University of Colorado BoulderCO80309 United States NASA/GSFC Navigation and Mission Design Branch 8800 Greenbelt Road GreenbeltMD20771 United States Lunar and Planetary Laboratory University of Arizona 1415 N 6th Ave TucsonAZ85705 United States

ISBN: (纸本)9780877036654

The Navigation Campaign of the NASA OSIRIS-REx mission consists of three phases: the Approach phase, Preliminary Survey phase, and the Orbital A phase. These phases spanned from August 2018 until February 28, 2019. The OSIRIS-REx spacecraft arrived at asteroid (101955) Bennu on December 3rd, 2018 thereby initiating the Preliminary Survey phase consisting of five 7-km altitude flybys of the asteroid. Orbit insertion followed on December 31st, 2018 commencing the Orbital A phase whereby the spacecraft’s average frozen orbit radius was less than 2 km. In this paper the small forces are presented that govern the spacecraft dynamics near the asteroid for the Navigation Campaign. These small forces include: solar radiation pressure, spacecraft thermal re-radiation, the antenna and LIDAR radiation pressure, and trending from desaturation maneuvers (desats). Extensive work on modeling these forces has enabled the navigation performance to exceed expectations and has reduced the stochastic accelerations below 1 x 10–12 km/s2 resulting in smaller trajectory predicted errors, essential for science planning of the mission. © 2020, Univelt Inc. All rights reserved.

关键词： Spacecraft

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