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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 8, Iss. 4 — May. 22, 2013

Sparse spectrum model for a turbulent phase

Mikhail Charnotskii  »View Author Affiliations


JOSA A, Vol. 30, Issue 3, pp. 479-488 (2013)
http://dx.doi.org/10.1364/JOSAA.30.000479


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Abstract

Monte Carlo (MC) simulation of phase front perturbations by atmospheric turbulence finds numerous applications for design and modeling of the adaptive optics systems, laser beam propagation simulations, and evaluating the performance of the various optical systems operating in the open air environment. Accurate generation of two-dimensional random fields of turbulent phase is complicated by the enormous diversity of scales that can reach five orders of magnitude in each coordinate. In addition there is a need for generation of the long “ribbons” of turbulent phase that are used to represent the time evolution of the wave front. This makes it unfeasible to use the standard discrete Fourier transform-based technique as a basis for the MC simulation algorithm. We propose a new model for turbulent phase: the sparse spectrum (SS) random field. The principal assumption of the SS model is that each realization of the random field has a discrete random spectral support. Statistics of the random amplitudes and wave vectors of the SS model are arranged to provide the required spectral and correlation properties of the random field. The SS-based MC model offers substantial reduction of computer costs for simulation of the wide-band random fields and processes, and is capable of generating long aperiodic phase “ribbons.” We report the results of model trials that determine the number of sparse components, and the range of wavenumbers that is necessary to accurately reproduce the random field with a power-law spectrum.

© 2013 Optical Society of America

OCIS Codes
(010.1300) Atmospheric and oceanic optics : Atmospheric propagation
(010.1330) Atmospheric and oceanic optics : Atmospheric turbulence
(030.1670) Coherence and statistical optics : Coherent optical effects
(030.7060) Coherence and statistical optics : Turbulence
(110.0115) Imaging systems : Imaging through turbulent media
(110.1080) Imaging systems : Active or adaptive optics

ToC Category:
Atmospheric and Oceanic Optics

History
Original Manuscript: November 27, 2012
Revised Manuscript: January 22, 2013
Manuscript Accepted: January 25, 2013
Published: February 22, 2013

Virtual Issues
Vol. 8, Iss. 4 Virtual Journal for Biomedical Optics

Citation
Mikhail Charnotskii, "Sparse spectrum model for a turbulent phase," J. Opt. Soc. Am. A 30, 479-488 (2013)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=josaa-30-3-479

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