MSE-based analysis of circular grating self-images for testing beam collimation

2020 ◽  
Vol 59 (24) ◽  
pp. 7160
Author(s):  
Shivangi Bande ◽  
Vimal Bhatia ◽  
Shashi Prakash
Keyword(s):  
Circular Grating ◽  
Beam Collimation

Lau effect and beam collimation

1997 ◽  
Vol 44 (1) ◽  
pp. 175-178 ◽  
Author(s):  
K. V. AVUDAINAYAGAM and S. CHITRALEKHA
Keyword(s):  
Beam Collimation

scholarly journals Biaxial 360-degree scanning LIDAR using a liquid crystal control

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Seiji Nishiwaki
Keyword(s):  
Liquid Crystal ◽  
Laser Light ◽  
Side Surface ◽  
Parallel Beam ◽  
Grating Couplers ◽  
Autonomous Cars ◽  
Scanning Lidar ◽  
Center Axis ◽  
Circular Grating ◽  
Segmented Electrode

AbstractSophisticated non-mechanical technology for LIDARs is needed to realize safe autonomous cars. We have confirmed the operating principle of a non-mechanical LIDAR by combining concentric circular-grating couplers (CGCs) with a coaxially aligned rod lens. Laser light incident vertically on the center of the inner CGC along the center axis of the lens is radiated from the outer CGC and passes through the side surface of the lens. It is converted to a parallel beam that scans in two axes by applying voltages to two area-segmented electrode layers sandwiching the CGCs and a liquid crystal layer formed on the CGCs. We have demonstrated scanning whose motion ranges were 360 degrees horizontally and 10° vertically. A beam with a spread angle of 0.3° × 0.8° at a minimum swept vertically up to a frequency of 100 Hz and ten equally spaced beams scanned rotationally with a 6-degree cycle variation of spread of between 0.8° and 3.5°.

Long focal length, asymmetric fan beam collimation for transmission acquisition with a triple camera SPECT system

1997 ◽  
Vol 44 (3) ◽  
pp. 1191-1196 ◽  
Author(s):  
D.R. Gilland ◽  
H. Wang ◽  
R.E. Coleman ◽  
R.J. Jaszczak
Keyword(s):  
Focal Length ◽  
Spect System ◽  
Beam Collimation

Use of a phase type elongated circular grating in Talbot moiré deflectometry

Optik ◽  
2004 ◽  
Vol 115 (3) ◽  
pp. 121-128 ◽  
Author(s):  
B.J. Kim ◽  
K.C. Yuk ◽  
S.I. Lee ◽  
S. Chang
Keyword(s):  
Phase Type ◽  
Circular Grating ◽  
Moiré Deflectometry

A high-throughput assembly of beam-shaping channel-cut monochromators for laboratory high-resolution X-ray diffraction and small-angle X-ray scattering experiments

2021 ◽  
Vol 54 (3) ◽  
Author(s):  
Peter Nadazdy ◽  
Jakub Hagara ◽  
Petr Mikulik ◽  
Zdenko Zaprazny ◽  
Dusan Korytar ◽  
...  
Keyword(s):  
High Resolution ◽  
Small Angle ◽  
Photon Flux ◽  
Photon Flux Density ◽  
X Ray Diffraction ◽  
High Beam ◽  
X Ray ◽  
X Ray Scattering ◽  
Beam Collimation ◽  
Ray Scattering

A four-bounce monochromator assembly composed of Ge(111) and Ge(220) monolithic channel-cut monochromators with V-shaped channels in a quasi-dispersive configuration is presented. The assembly provides an optimal design in terms of the highest transmittance and photon flux density per detector pixel while maintaining high beam collimation. A monochromator assembly optimized for the highest recorded intensity per detector pixel of a linear detector placed 2.5 m behind the assembly was realized and tested by high-resolution X-ray diffraction and small-angle X-ray scattering measurements using a microfocus X-ray source. Conventional symmetric and asymmetric Ge(220) Bartels monochromators were similarly tested and the results were compared. The new assembly provides a transmittance that is an order of magnitude higher and 2.5 times higher than those provided by the symmetric and asymmetric Bartels monochromators, respectively, while the output beam divergence is twice that of the asymmetric Bartels monochromator. These results demonstrate the advantage of the proposed monochromator assembly in cases where the resolution can be partially sacrificed in favour of higher transmittance while still maintaining high beam collimation. Weakly scattering samples such as nanostructures are an example. A general advantage of the new monochromator is a significant reduction in the exposure time required to collect usable experimental data. A comparison of the theoretical and experimental results also reveals the current limitations of the technology of polishing hard-to-reach surfaces in X-ray crystal optics.

scholarly journals Circular Grating Resonators as Small Mode-Volume Microcavities for Switching

2009 ◽  
Vol 17 (8) ◽  
pp. 5953 ◽  
Author(s):  
Sophie Schönenberger ◽  
Nikolaj Moll ◽  
Thilo Stöferle ◽  
Rainer F. Mahrt ◽  
Bert J. Offrein ◽  
...  
Keyword(s):  
Circular Grating ◽  
Mode Volume

scholarly journals Gamma beam collimation system and profile imager for ELI-NP

2019 ◽  
Vol 936 ◽  
pp. 41-42
Author(s):  
P. Cardarelli ◽  
G. Paternò ◽  
G. Di Domenico ◽  
E. Consoli ◽  
M. Marziani ◽  
...  
Keyword(s):  
Collimation System ◽  
Beam Collimation ◽  
Gamma Beam
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