Artem M. Vorontsov (Moscow State University, Department of Physics, Vorob’eve Gory and Optonicus LLC), Mikhail Vorontsov (University of Dayton and Optonicus LLC)
Keywords: Adaptive Optics, Imaging
Abstract:
In the conventional atmospheric turbulence numerical simulation techniques based on the split-operator method, the turbulence-induced refractive index inhomogeneities are represented by a set of infinitely narrow (2D) phase distorting layers (phase screens). These 2D phase screens are statistically independent (delta-correlated) along optical wave propagation direction. This commonly used model cannot be applied for computer analysis of long-range and deep turbulence effects associated with presence of large-scale (thick) refractive index layers with long correlation lengths. For the same reason the conventional thin (2D) phase screen approach does not permit analysis of optical systems whose performance depends on variation in optical path difference (piston phase) along the propagation path. Among these systems are coherent imaging ladars, optical vibrometers and interferometers. Contrary to the conventional approach, in the 3D-turbulence computer simulation technique introduced here, the turbulence-induced refractive index inhomogeneities are represented by a set of large-scale phase distorting slabs extended over long distance. In each 3D turbulent slab statistical properties of the refractive index correlation are preserved inside the entire 3D volume. The turbulent slabs can be extended up to a few kilometers or even longer and can be used for analysis of statistical characteristics of piston phase and its impact on coherent heterodyne detection systems.
Date of Conference: September 11-14, 2012
Track: Adaptive Optics and Imaging