Experiments Of He Ne Laser Beam Propagation In The Atmosphere
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Experiments Of He Ne Laser Beam Propagation In The Atmosphere
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Author : S. Sandroni
language : en
Publisher:
Release Date : 1976
Experiments Of He Ne Laser Beam Propagation In The Atmosphere written by S. Sandroni and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with categories.
Experiments Of He Ne Laser Beam Propagation In The Atmosphere
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Author :
language : en
Publisher:
Release Date : 1976
Experiments Of He Ne Laser Beam Propagation In The Atmosphere written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with categories.
Laser Beam Propagation In The Atmosphere
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Author : Hugo Weichel
language : en
Publisher: SPIE Press
Release Date : 1990
Laser Beam Propagation In The Atmosphere written by Hugo Weichel and has been published by SPIE Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Science categories.
Laser Beam Propagation In The Atmosphere
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Author : J. W. Strohbehn
language : en
Publisher:
Release Date : 1978
Laser Beam Propagation In The Atmosphere written by J. W. Strohbehn and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Atmosphere categories.
Atmospheric Attenuation Of Hene Laser Radiation
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Author : Graham G. Williford
language : en
Publisher:
Release Date : 1977
Atmospheric Attenuation Of Hene Laser Radiation written by Graham G. Williford and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with categories.
Atmospheric attenuation of a low-powered HeNe laser beam was examined both theoretically and experimentally. Experimental results were limited, but useful information could be extracted from the data. Close agreement was found between experimental results and theoretical predictions based on interpolation between aerosol coefficients given by McClatchey and Selby. The effects of atmospheric turbulence upon laser propagation were also examined. An attempt was made to minimize the effect turbulence had upon test results, so that atmospheric attenuation could be studied independently. The conclusion of a theoretical study was that this could be accomplished by using a receiver several times larger than the beam size at the target. The prediction proved true during test runs. The experimentation was conducted over a 1.23 kilometer course, using a 2 milliwatt HeNe laser as the transmitter, and a 12 inch spherical mirror as the receiver. Tests were conducted under visibility conditions ranging from 2 kilometers to 18 kilometers. (Author).
Experimental Investigations Of Optical Propagation In Atmospheric Turbulence
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Author : Michael W. Fitzmaurice
language : en
Publisher:
Release Date : 1971
Experimental Investigations Of Optical Propagation In Atmospheric Turbulence written by Michael W. Fitzmaurice and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with Atmospheric chemistry categories.
The pertinent theoretical background and the results of a group of experiments conducted over 0.4- and 1.17-km near-ground horizontal ranges are presented. (1) The log-amplitude variances for HeNe (0.633 μm) and CO2 (10.6 μm) laser beams were found to have a ratio of 26.8, which is in close agreement with the predictions of Rytov-based spherical-wave theory. (2) Published measurements of the saturation level of the log-amplitude variance are reviewed and several inconsistencies noted. (3) The spatial correlation function of irradiance field was measured and found to agree with theory. The degree of correlation between different frequency beams which had traversed the same optical path was also measured and compared to theory. The data exhibited an unacceptably large scatter and did not show the wavelength dependence. (4) The log-normal, Rayleigh, and Rice probability distributions are discussed in terms of their applicability to irradiance statistics. Relatively weak 10.6 μm irradiance fluctuations were found to be equally well described by the log-normal and Rice distributions; strong fluctuations obtained at 0.488 μm were clearly best described by the log-normal distribution.
Experimental Investigation Of The Transformation Of Laser Radiation By Optical Systems
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Author : K. Kelov
language : en
Publisher:
Release Date : 1968
Experimental Investigation Of The Transformation Of Laser Radiation By Optical Systems written by K. Kelov and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1968 with categories.
The cross section of 6328-A He/Ne-laser beams during propagation through the atmosphere and through optical systems was investigated. After demonstrating the Gaussian nature of the TEM sub 00 mode of this laser, an empirical formula was derived which described the beam broadening during propagation. Nonuniform intensity distribution was shown to be caused by interference phenomena upon passage through various lens systems.
Experimental Investigations Of Optical Propagation In Atmospheric Turbulence
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Author : Michael W. Fitzmaurice
language : en
Publisher:
Release Date : 1971
Experimental Investigations Of Optical Propagation In Atmospheric Turbulence written by Michael W. Fitzmaurice and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with Atmospheric chemistry categories.
The pertinent theoretical background and the results of a group of experiments conducted over 0.4- and 1.17-km near-ground horizontal ranges are presented. (1) The log-amplitude variances for HeNe (0.633 μm) and CO2 (10.6 μm) laser beams were found to have a ratio of 26.8, which is in close agreement with the predictions of Rytov-based spherical-wave theory. (2) Published measurements of the saturation level of the log-amplitude variance are reviewed and several inconsistencies noted. (3) The spatial correlation function of irradiance field was measured and found to agree with theory. The degree of correlation between different frequency beams which had traversed the same optical path was also measured and compared to theory. The data exhibited an unacceptably large scatter and did not show the wavelength dependence. (4) The log-normal, Rayleigh, and Rice probability distributions are discussed in terms of their applicability to irradiance statistics. Relatively weak 10.6 μm irradiance fluctuations were found to be equally well described by the log-normal and Rice distributions; strong fluctuations obtained at 0.488 μm were clearly best described by the log-normal distribution.
Experiments For Laser Beam Propagation Through Optical Turbulence
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Author : Angel Fernandez
language : en
Publisher:
Release Date : 2016
Experiments For Laser Beam Propagation Through Optical Turbulence written by Angel Fernandez and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
Atmospheric turbulence, generated by a differential temperature between the Earth's surface and the atmosphere, causes effects on optical waves that have been of great interest to scientists for many years. Wave front distortions in the optical wave induced by atmospheric turbulence result in a spreading of the beam beyond that due to pure diffraction, random variations of the position of the beam centroid, and a random redistribution of the beam energy within a cross section of the beam leading to irradiance fluctuations. Those effects have far-reaching consequences on astronomical imaging, free space optics (FSO) communications, remote sensing, laser satellite communication, astronomical imaging, adaptive optics, target designation, hyperspectral LiDAR, and other applications that require the transmission of optical waves through the atmosphere. Throughout this thesis, we introduce a globally concept of turbulence, focusing in atmospheric turbulence.Diverse experiments have been carried out, for instance, the propagation of two parallel thin beams under geometrical optics condition for studying the parameters of optical turbulence, and besides, the same optical configuration was used to investigate the best sampling rate for optical turbulence. Furthermore, we have measured evapotranspiration by remote sensing, in which we have heeded the fluctuations of the refractive index through the intensities of the turbulence. Finally, experiments which involve a new beam are also developed, such as phase-flipped Gaussian beam. This beam shows an experimental reduction on its irradiance fluctuations induced by the turbulence, which means that it has a high performance in optical communications. The experimental reduction aforementioned is proved through the comparison with the theory developed.
Laser Beams In The Atmosphere
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Author : Vladimir Evseevich Zuev
language : en
Publisher:
Release Date : 1982
Laser Beams In The Atmosphere written by Vladimir Evseevich Zuev and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Atmosphere categories.