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Proceedings Paper

Evaluation of phase-shifting techniques for a self-referencing interferometer wavefront sensor
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Paper Abstract

The Air Force Research Laboratory is developing a Self-Referencing Interferometer (SRI) wavefront sensor (WFS) for applications requiring laser propagation in strong scintillation. This paper compares several phase-shifting techniques that can be used to capture interference patterns and examines their effects on SRI WFS performance. These techniques include temporal, spatial, and spatial-temporal phase shifting. Temporal phase shifting allows for straightforward setup, alignment, and calibration, though its performance is degraded by changes in the atmosphere between measurements. Spatial phase shifting effectively "freezes" the atmosphere, but requires more rigorous camera calibration and alignment. Spatial-temporal phase shifting balances the benefits and challenges of both methods. This paper includes a discussion of the tradeoffs involved in selecting an appropriate phase-shifting approach for a given application. Laboratory results demonstrate the advantages and disadvantages of each technique in evaluation of SRI WFS performance.

Paper Details

Date Published: 30 August 2005
PDF: 12 pages
Proc. SPIE 5894, Advanced Wavefront Control: Methods, Devices, and Applications III, 58940R (30 August 2005); doi: 10.1117/12.619448
Show Author Affiliations
Melissa S. Corley, Air Force Research Lab. (United States)
Troy A. Rhoadarmer, Air Force Research Lab. (United States)

Published in SPIE Proceedings Vol. 5894:
Advanced Wavefront Control: Methods, Devices, and Applications III
Mark T. Gruneisen; John D. Gonglewski; Michael K. Giles, Editor(s)

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