Simulation Test and Inhibit Method of Forward Scattered Stray Light of Polarized Beam Split Optical Antenna

2016 ◽  
Vol 45 (4) ◽  
pp. 406002
Author(s):  
吕娟 L Juan ◽  
马小龙 MA Xiao-long ◽  
贺应红 HE Ying-hong ◽  
闫兴涛 YAN Xing-tao ◽  
解培月 XIE Pei-yue ◽  
...  
Keyword(s):  
Stray Light ◽  
Optical Antenna ◽  
Simulation Test ◽  
Polarized Beam ◽  
Beam Split

Stray Light Analysis and Test of Cassegrain Optical Antenna

2015 ◽  
Vol 44 (8) ◽  
pp. 806002
Author(s):  
李婷 LI Ting ◽  
马小龙 MA Xiao-long ◽  
李福 LI Fu ◽  
薛彬 XUE Bin ◽  
徐广州 Xu Guang-zhou ◽  
...  
Keyword(s):  
Stray Light ◽  
Optical Antenna

A low stray light, high current, low energy electron source

1999 ◽  
Vol 70 (10) ◽  
pp. 3886-3888 ◽  
Author(s):  
M. Adelt ◽  
R. Körber ◽  
W. Drachsel ◽  
H.-J. Freund
Keyword(s):  
Electron Source ◽  
Low Energy ◽  
Energy Electron ◽  
Stray Light ◽  
High Current ◽  
Low Energy Electron

scholarly journals Recent Advances in Photoalignment Liquid Crystal Polarization Gratings and Their Applications

Crystals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 900
Author(s):  
Tiegang Lin ◽  
Jin Xie ◽  
Yingjie Zhou ◽  
Yaqin Zhou ◽  
Yide Yuan ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Optical Anisotropy ◽  
Review Paper ◽  
Fabrication Process ◽  
Polarization Gratings ◽  
High Diffraction Efficiency ◽  
Physical Principles ◽  
High Diffraction ◽  
Exposure Methods ◽  
Beam Split

Liquid crystal (LC) circular polarization gratings (PGs), also known as Pancharatnam–Berry (PB) phase deflectors, are diffractive waveplates with linearly changed optical anisotropy axes. Due to the high diffraction efficiency, polarization selectivity character, and simple fabrication process, photoalignment LC PGs have been widely studied and developed especially in polarization management and beam split. In this review paper, we analyze the physical principles, show the exposure methods and fabrication process, and present relevant promising applications in photonics and imaging optics.

scholarly journals Stray light characterization with ultrafast time-of-flight imaging

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
L. Clermont ◽  
W. Uhring ◽  
M. Georges
Keyword(s):  
Path Length ◽  
Imaging System ◽  
Time Of Flight ◽  
Optical Path Length ◽  
Optical Path ◽  
Stray Light ◽  
Laser Source ◽  
Space Telescopes ◽  
Characterization Methods ◽  
Instance Space

AbstractUnderstanding stray light (SL) is a crucial aspect in the development of high-end optical instruments, for instance space telescopes. As it drives image quality, SL must be controlled by design and characterized experimentally. However, conventional SL characterization methods are limited as they do not provide information on its origins. The problem is complex due to the diversity of light interaction processes with surfaces, creating various SL contributors. Therefore, when SL level is higher than expected, it can be difficult to determine how to improve the system. We demonstrate a new approach, ultrafast time-of-flight SL characterization, where a pulsed laser source and a streak camera are used to record individually SL contributors which travel with a specific optical path length. Furthermore, the optical path length offers a means of identification to determine its origin. We demonstrate this method in an imaging system, measuring and identifying individual ghosts and scattering components. We then show how it can be used to reverse-engineer the instrument SL origins.

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