Share Email Print

Proceedings Paper

Finite outer scale considerations for beam-steering optimization
Author(s): Matthew R. Whiteley
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

Finite turbulence outer scale attenuates turbulence power at low spatial frequencies, providing a finite variance for turbulence-induced phase. The temporal properties of low spatial-frequency aberrations such as tilt are affected directly by finite outer scale turbulence models. When optical estimation techniques are used in beam-steering applications, the estimator form and its performance are related directly to the correlative properties of tilt and higher-order modes as determined by the value of Lo/D. In this work, we consider the effect of finite turbulence outer scale on the performance of optical tilt compensation incorporating time-delayed tilt plus higher-order modes. The results indicate that while smaller values of Lo/D provide for higher Strehl ratios after tilt compensation, the Strehl ratio gain obtained through optimal compensation is reduced with decreasing values of Lo/D. For the relative aperture diameter D/r0 equals 5 and using time-delayed tilt plus higher-order modes through Zernike 15, the Strehl ratio gain with time delay vr/D equals 0.5 is approximately 15 for L0D equals 100. Under the same conditions, the Strehl ratio gain for L0D equals 2 is approximately 3.

Paper Details

Date Published: 3 August 1999
PDF: 11 pages
Proc. SPIE 3706, Airborne Laser Advanced Technology II, (3 August 1999); doi: 10.1117/12.356974
Show Author Affiliations
Matthew R. Whiteley, Air Force Research Lab. (United States)

Published in SPIE Proceedings Vol. 3706:
Airborne Laser Advanced Technology II
Todd D. Steiner; Paul H. Merritt, Editor(s)

© SPIE. Terms of Use
Back to Top