Coherence characterization of a phase-lockedpartially coherent flat-topped array laser beampropagating through underwater turbulence
Publish place: کنفرانس بین المللی پژوهش در علوم و مهندسی
Publish Year: 1395
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
ICRSIE01_435
تاریخ نمایه سازی: 25 آذر 1395
Abstract:
In this research, based on an analytical expression for Cross-Spectral Density (CSD)matrix elements, coherence properties of phase-locked partially coherent flat-topped(PCFT) radial array laser beams propagating through propagating through the clear waterturbulent ocean are explored. Due to the complicated nature of the oceanicturbulencespectrum, the analysis is restricted to numerical computations. The simulation is done byconsidering the effects of source parameters (such as radius of array setup’s circle,effective width of the spectral degree of coherence and wavelength) and turbulent oceanfactors (such as the rate of dissipation of the turbulent kinetic energyper unit mass offluid, , and relative strength of temperature and salinity fluctuations, , Kolmogorovmicro-scale, , and rate of dissipation of the mean squared temperature, T ) in detail.Results indicate that, for off-axis propagation points, the spectral degree of coherencedegrades to a minimum value (zero at far field) with decreasing in the values of and alongside with the increasing in the value of T , which are corresponding to increase inthe strength of oceanic turbulence. In addition, in oceanic media, PCFT array laser beamshaving the longer source’s correlation length, flatness order and wavelength or a smallerradius of array setup’s ring are found to be advantageous in the sense of slow degradationof the coherence degree at all propagation distances.
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Authors
Masoud Yousefi
PhD student, School of Physics, Iran University of Science and Technology, Tehran, Iran,
Shole Golmohammady
PhD student, School of Physics, Iran University of Science and Technology, Tehran, Iran,
Amir Aghajani
MSc student, School of Physics, Iran University of Science and Technology, Tehran, Iran,
Bijan Ghafary
ghafary@iust.ac.ir
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