Research on a device of eliminating stray light in transceiver of laser communication

2020 ◽  
Author(s):  
Yang Song ◽  
Wenyi Chai ◽  
Yongming Hu ◽  
Enshi Qu ◽  
Wei Xin ◽  
...  
Keyword(s):  
Stray Light ◽  
Laser Communication

Stray Light Elimination Methods for Laser Communication System with Submarine

2011 ◽  
Vol 189-193 ◽  
pp. 2593-2596
Author(s):  
Hai Yan Li ◽  
Lian Sheng Wang ◽  
Xu Dong Liu
Keyword(s):  
Communication System ◽  
Green Laser ◽  
Optical Receiver ◽  
Stray Light ◽  
Military Power ◽  
Laser Communication ◽  
Receiver System ◽  
Long Time ◽  
Communication Ability

Submarine is an important part of modern military power, and communication with submarine is a key problem which needs solving. Blue-green laser communication system with submarine can improve the safe depth and communication speed of submarine greatly, and many countries have paid a lot of attention to develop laser communication system for a long time. The disturbance would communicate in the whole system if the stray lights exit and influence the signals on detector focus surface, and these will increase the BER and influence the communication ability. This optical receiver system adopting Ritchey-Chretien(R-C) Cassegrain structure of blue-green laser communication system with submarine is introduced firstly in this paper, and then the sources of stray light are analyzed detailedly. The corresponding elimination methods for stray light are proposed and according to the analysis, the further optimization can be carried out.

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 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.

scholarly journals Microwave Spectroscopy as a Potential Tool for Color Grading Diamonds

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3507
Author(s):  
Yossi Rabinowitz ◽  
Ariel Etinger ◽  
Asher Yahalom ◽  
Haim Cohen ◽  
Yosef Pinhasi
Keyword(s):  
Electromagnetic Property ◽  
Precise Determination ◽  
Visible Spectral Range ◽  
Stray Light ◽  
Light Transmittance ◽  
Structural Defects ◽  
Frequency Range ◽  
Color Grade ◽  
Color Grading ◽  
Nitrogen Contamination

A diamond’s color grading is a dominant property that determines its market value. Its color quality is dependent on the light transmittance through the diamond and is largely influenced by nitrogen contamination, which induces a yellow/brown tint within the diamond, as well as by structural defects in the crystal (in rare cases boron contamination results in a blue tint). Generally, spectroscopic instrumentation (in the infrared or UV–visible spectral range) is used in industry to measure polished and rough diamonds, but the results are not accurate enough for precise determination of color grade. Thus, new methods should be developed to determine the color grade of diamonds at longer wavelengths, such as microwave (MV). No difference exists between rough and polished diamonds regarding stray light when the MW frequency is used. Thus, several waveguides that cover a frequency range of 3.95–26.5 GHz, as well as suitable resonator mirrors, have been developed using transmission/reflection and resonator methods. A good correlation between the S12 parameter and the nitrogen contamination content was found using the transmission/reflection method. It was concluded that electromagnetic property measurements of diamonds in the MW frequency range can be used to determine their nitrogen content and color grading. The MW technique results were in good agreement with those obtained from the infrared spectra of diamonds.

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