Experimental measurement of tilt correlation with higher-order modes in the time domain for turbulence-induced phase aberrations: implications to airborne laser beam steering

Matthew R. Whiteley; Patrick J. Gardner

doi:10.1117/12.323930

8 September 1998 Experimental measurement of tilt correlation with higher-order modes in the time domain for turbulence-induced phase aberrations: implications to airborne laser beam steering

Matthew R. Whiteley, Patrick J. Gardner

Author Affiliations +

Proceedings Volume 3381, Airborne Laser Advanced Technology; (1998) https://doi.org/10.1117/12.323930
Event: Aerospace/Defense Sensing and Controls, 1998, Orlando, FL, United States

Abstract

Theoretical analysis of the temporal cross-correlation properties of turbulence-induced phase aberrations predict that while tilt is uncorrelated with most higher-order modes at zero time delay, the magnitude of the cross-correlation increases through some maximum value before going to zero at long time delays. To test this theoretical prediction, we employ laboratory measurements of phase induced on a laser beam propagating through a channeled flow of turbulent gas. From these measurements, the temporal cross-correlation of various aberration modes was estimated. Theoretical expressions were derived for these cross-correlations, and the results of these calculations agree well with experimental measurements. Both the experimental and the theoretical results demonstrate that the magnitude of cross- correlation between tilt and higher-order modes is non-zero over a range of temporal delay. Thus, higher-order model measurements may be incorporated into an optimal estimator for tilt, enhancing estimator performance.

Citation Download Citation

Matthew R. Whiteley and Patrick J. Gardner "Experimental measurement of tilt correlation with higher-order modes in the time domain for turbulence-induced phase aberrations: implications to airborne laser beam steering", Proc. SPIE 3381, Airborne Laser Advanced Technology, (8 September 1998); https://doi.org/10.1117/12.323930

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