Experimental Investigations of Optical Propagation in Atmospheric Turbulence - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Experimental Investigations of Optical Propagation in Atmospheric Turbulence write by Michael W. Fitzmaurice. This book was released on 1971. Experimental Investigations of Optical Propagation in Atmospheric Turbulence available in PDF, EPUB and Kindle. 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 Investigations of Optical Propagation in Atmospheric Turbulence
Experimental Investigations of Optical Propagation in Atmospheric Turbulence - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Experimental Investigations of Optical Propagation in Atmospheric Turbulence write by Michael W. Fitzmaurice. This book was released on 1971. Experimental Investigations of Optical Propagation in Atmospheric Turbulence available in PDF, EPUB and Kindle. 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
Experiments for Laser Beam Propagation Through Optical Turbulence - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Experiments for Laser Beam Propagation Through Optical Turbulence write by Angel Fernandez. This book was released on 2016. Experiments for Laser Beam Propagation Through Optical Turbulence available in PDF, EPUB and Kindle. 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.
Experimental Investigation Into Spatial Quantum Optical Properties for Satellite Targeting Through the Turbulent Atmosphere
Experimental Investigation Into Spatial Quantum Optical Properties for Satellite Targeting Through the Turbulent Atmosphere - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Experimental Investigation Into Spatial Quantum Optical Properties for Satellite Targeting Through the Turbulent Atmosphere write by Christopher Pugh. This book was released on 2013. Experimental Investigation Into Spatial Quantum Optical Properties for Satellite Targeting Through the Turbulent Atmosphere available in PDF, EPUB and Kindle. A major field of research at the current time is that of implementing Quantum Key Distribution over large distances using satellites. If this protocol works with this technology, it will have huge implications on future information security. In order for a satellite to implement this idea, there are many aspects that must be taken into account. One of the big issues that comes up for this type of system is that of propagating light through the turbulent atmosphere and its effects on the acquisition, pointing and tracking system. The projects studied in this thesis study some of the effects of the atmosphere on certain detectors, try to develop pointing schemes for better accuracy as well as develop knowledge in free space propagation of other single photon experiments. In the first experiment, I study the spatial correlations of the daughter photons created in spontaneous parametric down conversion. I look at the effect of altering the pump beam on the positions of the down converted photons and see if the pump can be manipulated in a way to control the directions of the daughter photons. I begin to utilize a deformable mirror and Shack-Hartmann wavefront sensor which are generally used in adaptive optics, but we plan to use them to alter the pump beam in the spontaneous parametric down conversion process to analyze the correlations between the pump and down converted photons. The second experiment investigates the effects of laser scintillation on the performance of a possible tracking device that could be implemented on a satellite. This quad sensor tracks the position of a beam and a system will be developed to move the sensor to keep the beam in the center where there is a hole for the quantum single photons to stream through. In order to create the effects of scintillation, a turbulence simulator box was built and characterized. This box combines wind turbulence with a heat gradient to mimic atmospheric turbulence on a small scale. Finally, my contributions to a large scale, long distance free space quantum optics experiment are explained and the overall goal of the experiment is discussed. This experiment exposed me to actual free space transmission issues as well as many fundamental techniques for performing long distance optics experiments. In this experiment there was no correction for atmospheric turbulence, but in the future, techniques could be implemented which might increase the efficiencies of the free space links.
Experimental Study of Laser Propagation Through the Atmospheric Turbulence
Experimental Study of Laser Propagation Through the Atmospheric Turbulence - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Experimental Study of Laser Propagation Through the Atmospheric Turbulence write by Kirk Alan Lohnes. This book was released on 1980. Experimental Study of Laser Propagation Through the Atmospheric Turbulence available in PDF, EPUB and Kindle.
