Results 61 to 70 of about 13,728 (209)

Wavefront control with algorithmic differentiation on the HiCAT testbed [PDF]

, 2021
International audienceFuture space-based coronagraphs will rely critically on focal-plane wavefront sensing and control with deformable mirrors to reach deep contrast by mitigating optical aberrations in the primary beam path. Until now, most focal-plane
Soummer, Rémi, Pourcelot, Raphael, Fienup, James, R., Will, Scott, D., Laginja, Iva, Sahoo, Ananya, Pueyo, Laurent, Perrin, Marshall, D, Por, Emiel, H, Petrone, Peter, Noss, James, Redmond, Susan, M., Groff, Tyler, D.   +12 more
core   +1 more source

Broadband High-Efficiency Co-Polarized Wavefront Manipulation Based on Multi-Layered Metasurface for Terahertz Wave

IEEE Access
Metasurfaces can achieve multifunctional wavefront control, but most co-polarized metasurfaces can only achieve a 360° phase coverage at specific frequency points. In this paper, we propose a metasurface with efficient co-polarized Terahertz (THz)
Su Zong, Jiajun Liang
doaj   +1 more source

Active Adjustment of the Subreflector Shape for the Large Dual-Reflector Antenna

Micromachines, 2023
A shape adjustment method for subreflectors based on minimizing the residual wavefront error of the large dual-reflector antenna is presented. This method is used to compensate for the antenna structural deformation caused by environment loading.
Binbin Xiang, Tianxiang Zheng, Wei Wang, Peiyuan Lian, Guljaina Kazezkhan, Jianping Zhou, Kai Li   +6 more
doaj   +1 more source

Low Order Wavefront Sensing and Control for WFIRST-AFTA Coronagraph [PDF]

, 2015
To maintain the required WFIRST Coronagraph performance in a realistic space environment, a low order wavefront sensing and control (LOWFS/C) subsystem is necessary.
Lam, Raymond, Wang, Xu, Kern, Brian, James Moore, Wilson, Dan, Tweddle, Brent, Shi, Fang, Keith Patterson, Dan Wilson, John Krist, Douglas Moore, Hien, Randall, Moore, Douglas, Randall Hein, Kent Wallace, Raymond Lam, Ilya Poberezhskiy, Erkin Sidick, Shields, Joel, Joel Shields, Tuan Truong, Bartos, Randall, Poberezhskiy, Ilya, Randall Bartos, Wallace, Kent, Brian Kern, Xu Wang, Truong, Tuan, Kunjithapatham Balasubramanian, Patterson, Keith, Fang Shi, Krist, John, Hong Tang, Sidick, Erkin, Tang, Hong, Moore, James, Balasubramanian, Kunjithapatha   +36 more
core   +1 more source

Uniformity and wavefront control of optical filters [PDF]

International Conference on Space Optics — ICSO 2018, 2019
The present paper addresses uniformity effects in demanding dielectric optical coatings. The origins of spectral resonant wavefront errors (WFE) induced by non-uniformities in complex dielectric filters are investigated in detail. The coating is a broad-band beamsplitter with a high reflectance between 400 and 900 nm and a high transmittance between ...
Michael Vergöhl, Chris Britze, Stefan Bruns, Andreas Pflug, Jennifer Zimara, Bernd Schäfer, Klaus Mann, Volker Kirschner   +7 more
openaire   +1 more source

Time-reversed optical focusing through scattering media by digital full phase and amplitude recovery using a single phase-only SLM [PDF]

Journal of Innovative Optical Health Sciences, 2015
Focusing light though scattering media beyond the ballistic regime is a challenging task in biomedical optical imaging. This challenge can be overcome by wavefront shaping technique, in which a time-reversed (TR) wavefront of scattered light is generated
Qiang Yang, Xinzhu Sang, Daxiong Xu
doaj   +1 more source

Spherical aberration correction suitable for a wavefront controller

Optics Express, 2009
We propose a simple method to correct a large amount of spherical aberration caused by a refractive index mismatch. The method is based on inverse ray tracing and can generate correction phase patterns whose peak-to-valley values are minimized. We also demonstrated spherical aberration correction in a transparent acrylic block using a liquid-crystal-on-
Haruyasu, Itoh, Naoya, Matsumoto, Takashi, Inoue   +2 more
openaire   +2 more sources

Wavefront curvature sensing and control in microscopy [PDF]

, 2022
The purposes are multiples: creation of a wavefront curvature sensor, use of the curvature sensing to control a multi-actuator lens developed at CNR-IFN of Padua (18 piezoelectric actuators) and use of the multi-actuator lens to generate an astigmatic ...
Dalle Rive, Gianluca
core  

Detection and Anti‐Detection with Microwave‐Infrared Compatible Camouflage Using Asymmetric Composite Metasurface

Advanced Science
Detection and anti‐detection with multispectral camouflage are of pivotal importance, while suffer from significant challenges due to the inherent contradiction between detection and anti‐detection and conflict microwave and infrared (IR) stealth ...
Yanzhao Wang, Huiling Luo, Yanzhang Shao, Hui Wang, Tong Liu, Zhengjie Wang, Kai‐yue Liu, Xiaogang Su, He‐Xiu Xu   +8 more
doaj   +1 more source

Wavefront Sensing and Control for JWST

Frontiers in Optics 2008/Laser Science XXIV/Plasmonics and Metamaterials/Optical Fabrication and Testing, 2008
The Wavefront Sensing and Controls commission process for the James Webb Space Telescope will be described, and data from supporting experiments will be presented.
openaire   +2 more sources