17 October 2012 Aggregate behavior of branch points: characterization in wave optical simulation
Author Affiliations +
Optical Engineering, 51(10), 106001 (2012). doi:10.1117/1.OE.51.10.106001
Atmospheric turbulence imparts phase distortions on propagating optical waves. These distortions couple into amplitude fluctuations at the pupil of a telescope, which, for strong enough phase distortions, produce zeros in the amplitude called branch points. In our earlier work, we presented the case that branch points can be utilized as a source of information on the turbulent atmosphere. Using our bench-top data, we have demonstrated several properties of branch points including motion, density, persistence and separation. We have shown that the pupil plane motion of subsets of branch points scales to the velocities of atmospheric turbulence layers and identifies the number of branch point producing layers. We have identified empirical relationships for density and separation as functions of the strength and altitude for a single layer. All of this work has been done using a bench-top adaptive optics system utilizing a two-layer atmospheric turbulence simulator. In this paper, we use simulations to verify these previous results by showing that all of these branch point properties follow similar behaviors in independently anchored wave optics simulations.
© 2012 Society of Photo-Optical Instrumentation Engineers (SPIE)
Denis W. Oesch, Carolyn M. Tewksbury-Christle, Darryl J. Sanchez, Patrick R. Kelly, "Aggregate behavior of branch points: characterization in wave optical simulation," Optical Engineering 51(10), 106001 (17 October 2012). https://doi.org/10.1117/1.OE.51.10.106001


Optical simulations

Velocity measurements

Optical engineering

Adaptive optics

Atmospheric modeling

Atmospheric turbulence

Back to Top