The intensity distribution in the focal plane of a light beam that has passed through a layer of a turbulent atmosphere

1971 ◽  
Vol 14 (8) ◽  
pp. 946-948
Author(s):  
�. I. Gel'fer ◽  
A. S. Gurvich ◽  
A. M. Cheremukhin
Keyword(s):  
Light Beam ◽  
Intensity Distribution ◽  
Turbulent Atmosphere ◽  
Focal Plane

Expansion of a Focused Laser Beam in the Turbulent Atmosphere

1971 ◽  
Vol 49 (10) ◽  
pp. 1233-1248 ◽  
Author(s):  
A. D. Varvatsis ◽  
M. I. Sancer
Keyword(s):  
Laser Beam ◽  
Free Space ◽  
Turbulent Atmosphere ◽  
Focal Plane ◽  
Spot Size ◽  
Small Aperture ◽  
Forward Scatter ◽  
Green’S Theorem ◽  
Focused Beams ◽  
Weakly Dependent

This work examines the expansion of a focused laser beam in the turbulent atmosphere. The formulation is based on Green's theorem and the valid assumption that the turbulent atmosphere is a forward-scatter medium for wavelengths of interest (0.6 μ < λ < 11 μ). The main results are: (1) the spot size at the free-space focal plane in the presence of turbulence is independent of the aperture radius, and is only weakly dependent on the wavelength, (2) the focal plane can be significantly shifted for small aperture radii, short wavelengths, and long free-space focal lengths, (3) the effect of the atmosphere is pronounced only close to the free-space focus and very far away, and (4) the turbulent atmosphere has a stronger effect on weakly focused beams rather than strongly focused beams, except very close to the free-space focus, where the effect is more pronounced for strongly focused beams.

Nonlinear-resonance line shapes: Dependence on the transverse intensity distribution of a light beam

2004 ◽  
Vol 69 (2) ◽  
Author(s):  
A. V. Taĭchenachev ◽  
A. M. Tumaikin ◽  
V. I. Yudin ◽  
M. Stähler ◽  
R. Wynands ◽  
...  
Keyword(s):  
Light Beam ◽  
Intensity Distribution ◽  
Resonance Line ◽  
Nonlinear Resonance ◽  
Line Shapes

Erratum: Nonlinear-resonance line shapes: Dependence on the transverse intensity distribution of a light beam [Phy. Rev. A 69, 024501 (2004)]

2005 ◽  
Vol 71 (2) ◽  
Author(s):  
A. V. Taĭchenachev ◽  
A. M. Tumaikin ◽  
V. I. Yudin ◽  
M. Stähler ◽  
R. Wynands ◽  
...  
Keyword(s):  
Light Beam ◽  
Intensity Distribution ◽  
Resonance Line ◽  
Nonlinear Resonance ◽  
Line Shapes

scholarly journals Fresnel Lens with Embedded Vortices

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Sunil Vyas ◽  
Rakesh Kumar Singh ◽  
Devinder Pal Ghai ◽  
P. Senthilkumaran
Keyword(s):  
Intensity Distribution ◽  
Focal Plane ◽  
Spatial Light Modulator ◽  
Phase Variation ◽  
Fresnel Lens ◽  
Light Modulator ◽  
Quadratic Phase ◽  
Topological Charges

Vortices of different charges are embedded in a wavefront that has quadratic phase variation, and the intensity distribution near the focal plane is studied. This method may be useful in realizing complicated beam profiles. We have experimentally demonstrated the generation of vortex arrays having integer as well as fractional topological charges that produce different intensity profiles at the focal plane. The phase variation realized on a spatial light modulator (SLM) acts as a Fresnel lens with embedded vortices.

scholarly journals Radio picture of the sun at 3.2-cm wavelength

1959 ◽  
Vol 9 ◽  
pp. 129-135
Author(s):  
V. V. Vitkevich ◽  
A. D. Kuz'min ◽  
A. E. Salomonovich ◽  
V. A. Udal'tsov
Keyword(s):  
Radio Emission ◽  
Radio Telescope ◽  
Intensity Distribution ◽  
Focal Plane ◽  
Meridian Plane ◽  
The Sun ◽  
Two Dimensional ◽  
Daily Movement ◽  
Academy Of Sciences ◽  
Astronomical Station

In 1957 July the two-dimensional intensity distribution of radio emission over the solar disk was determined at 3.2- and 10-cm wavelengths. The observations were carried out on the radio telescope 31 m in diameter at the Crimean Radio Astronomical Station of the Physical Institute of the Academy of Sciences of the U.S.S.R. The radio telescope was an immovable parabolic reflector with the axis set in the meridian plane on 22-degrees declination [1]. Scanning the pattern of the radio telescope in the declination range ±32 minutes of arc to obtain the intensity distribution was done by setting the feed and preamplifier on a movable carriage reciprocating near the focal plane. In combination with the sun's daily movement it provided the two-dimensional solar distribution along a zigzag line. These sections gave the radio picture.

Distribution of Emerged Energy for Daylight Illuminate on Prismatic Elements

2011 ◽  
Vol 133 (2) ◽  
Author(s):  
Shih-Chuan Yeh ◽  
Allen Jong-Woei Whang ◽  
Horng-Ching Hsiao ◽  
Xi-Duo Hu ◽  
Yi-Yung Chen
Keyword(s):  
Light Beam ◽  
Ray Tracing ◽  
Intensity Distribution ◽  
Calculation Model ◽  
Light Illumination ◽  
Natural Light ◽  
Detailed Calculation ◽  
Illumination System ◽  
Beam Incident ◽  
The Right

Prismatic elements are typical devices of natural light illumination system for redirecting and collecting daylight. Based on the principles of optics, this paper presents a simple mathematical matrix ray-tracing methodology through which a detailed intensity distribution of parallel light beam incident onto a right angled prism from different incident angles can be calculated precisely. We also present the distribution of the secondary emerged intensity from a prism illuminated by the emerged light of an adjacent prism. The direction, concentration, and distribution of intensity of the emerged light from the parallel light incident onto a surface of the right-angle prism, as well as daylight illuminate on a prismatic collector, are precisely calculated. The detailed calculation of the emerged light re-incident onto the adjacent prism or emerged out of the prismatic element presented that most of daylight are directly emerged out and are confined in some directions at earlier morning and afternoon, and the emerged light re-incident into the adjacent prism at noon around. This detailed calculation model of parallel light beam incident to a prismatic element can be applied to the hybrid natural light illumination system, as well as to the prism-relative solar illumination system for the improvement of efficiency.

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