Ultra-short longitudinal spatial coherence length of laser light with the combined effect of spatial, angular, and temporal diversity

2015 ◽  
Vol 106 (9) ◽  
pp. 093701 ◽  
Author(s):  
Azeem Ahmad ◽  
Vishal Srivastava ◽  
Vishesh Dubey ◽  
D. S. Mehta
Keyword(s):  
Coherence Length ◽  
Laser Light ◽  
Spatial Coherence ◽  
Combined Effect ◽  
Temporal Diversity

Extraordinary Coherent Thermal Emission From SiC Due to Coupled Resonant Cavities

2008 ◽  
Vol 130 (11) ◽  
Author(s):  
Nir Dahan ◽  
Avi Niv ◽  
Gabriel Biener ◽  
Yuri Gorodetski ◽  
Vladimir Kleiner ◽  
...  
Keyword(s):  
Quality Factor ◽  
Coherence Length ◽  
Thermal Emission ◽  
Spatial Coherence ◽  
Optical Filters ◽  
High Quality Factor ◽  
Experimental Results ◽  
Thermal Source ◽  
High Quality ◽  
Resonant Cavities

In high temperature and vacuum applications, when heat transfer is predominantly by radiation, the material’s surface texture is of substantial importance. Several micro- and nanostructure designs have been proposed to enhance a material’s emissivity and its radiative coherence, as control of thermal emission is of crucial concern in the design of infrared sources, optical filters, and sensing devices. In this research, an extraordinary coherent thermal emission from an anisotropic microstructure is experimentally and theoretically presented. The enhanced coherency is due to coherent coupling between resonant cavities obtained by surface standing waves, wherein each cavity supports a localized field that is attributed to coupled surface phonon polaritons. We show that it is possible to obtain a polarized quasimonochromatic thermal source from a SiC microstructure with a high quality factor of 600 at the resonant frequency of the cavity and a spatial coherence length of 716 wavelengths, which corresponds to an angular divergence of 1.4mrad. In the experimental results, we measured a quality factor of 200 and a spatial coherence length of 143 wavelengths. We attribute the deviation in the experimental results to imperfections in the fabrication of the high quality factor cavities.

scholarly journals Measuring and structuring the spatial coherence length of organic light-emitting diodes

2015 ◽  
Vol 10 (1) ◽  
pp. 82-90 ◽  
Author(s):  
Guohua Xie ◽  
Mingzhou Chen ◽  
Michael Mazilu ◽  
Shuyu Zhang ◽  
A.K. Bansal ◽  
...  
Keyword(s):  
Coherence Length ◽  
Light Emitting Diodes ◽  
Spatial Coherence ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light

Effect of the spatial coherence length on the self-reconfiguration of a speckle field

2016 ◽  
Vol 94 (1) ◽  
Author(s):  
Cleberson R. Alves ◽  
Alcenísio J. Jesus-Silva ◽  
Eduardo J. S. Fonseca
Keyword(s):  
Coherence Length ◽  
Spatial Coherence ◽  
The Self ◽  
Speckle Field

Effect of finite spatial coherence length on small-angle scattering

2015 ◽  
Vol 48 (6) ◽  
pp. 1660-1664 ◽  
Author(s):  
Yuya Shinohara ◽  
Yoshiyuki Amemiya
Keyword(s):  
Small Angle ◽  
Coherence Length ◽  
Spatial Coherence ◽  
Small Angle Scattering ◽  
Forward Scattering ◽  
X Ray Diffraction ◽  
X Ray ◽  
X Ray Imaging ◽  
Angle Scattering ◽  
Diffraction Imaging

This study shows that forward scattering at the origin of reciprocal space contributes to the scattering intensity profiles of ultra-small-angle scattering. The forward scattering corresponds to a Fourier transform of the X-ray coherent volume on a sample. This contribution is usually ignored in the study of small-angle scattering, while it is fully considered in the fields of X-ray imaging, such as coherent X-ray diffraction imaging and X-ray ptychography. This effect is explicitly illustrated in the context of small-angle scattering, and the effect of a finite spatial coherence length on small-angle scattering is discussed.

scholarly journals Step-by-step guide to reduce spatial coherence of laser light using a rotating ground glass diffuser

2017 ◽  
Vol 56 (19) ◽  
pp. 5427 ◽  
Author(s):  
Tim Stangner ◽  
Hanqing Zhang ◽  
Tobias Dahlberg ◽  
Krister Wiklund ◽  
Magnus Andersson
Keyword(s):  
Laser Light ◽  
Spatial Coherence ◽  
Ground Glass

Changes in longitudinal spatial coherence length of optical field in image space

2011 ◽  
Vol 37 (1) ◽  
pp. 45-48 ◽  
Author(s):  
D. V. Lyakin ◽  
V. P. Ryabukho
Keyword(s):  
Coherence Length ◽  
Spatial Coherence ◽  
Optical Field ◽  
Image Space

Analysis of spatial coherence length of high harmonic generated in argon

2021 ◽  
Vol 54 (1) ◽  
Author(s):  
Nor Azah Abdul Aziz ◽  
Emma Ziezie Mohd Tarmizi ◽  
Khuong Ba Dinh
Keyword(s):  
Coherence Length ◽  
High Harmonic ◽  
Spatial Coherence
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