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Proceedings Paper

Adaptive optics with the deformable mirror not in pupil: Part I. Experimental results
Author(s): Mala Mateen; Darryl Sanchez; Troy Rhoadarmer; Loretta Arguella; Denis W. Oesch; Deborah Fung; Roger Petty; Patrick Kelly; R. Anthony Vincent; Jeff Richey
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Paper Abstract

This is the first of two papers discussing aspects of placing the deformable mirror in a location not conjugate to the pupil plane of the telescope. The Starfire Optical Range, Air Force Research Laboratory's Directed Energy Directorate is in the process of developing a high efficiency AO system for its 3.5m optical telescope. The objective is to achieve maximum diffraction limited performance, i.e., largest pupil diameter possible, and maximum optical throughput. The later can be achieved by placing the deformable mirror outside the pupil. However placing the DM in a location not conjugate to the pupil results in a degradation in optical performance. This paper discusses experimental measurements of the degradation. In this paper we discuss the DM-not-in-pupil experimental testbed, the difficulties associated with creating this type of testbed, and how these difficulties were overcome. We also present results from the successful lab demonstration of closed loop performance with the DM placed out of pupil. We experimentally measured the degradation in Strehl and implemented a mitigation technique. Our experimental results indicate the mean degradation in Strehl as a result of placing the DM out of pupil to be between 7% and 9 %. This result is comparable with wave optics simulation and theoretical results which will be discussed in a companion paper, "Adaptive optics with DM not in pupil - Part 2: Mitigation of Degradation".

Paper Details

Date Published: 26 August 2008
PDF: 18 pages
Proc. SPIE 7093, Advanced Wavefront Control: Methods, Devices, and Applications VI, 70930A (26 August 2008); doi: 10.1117/12.794845
Show Author Affiliations
Mala Mateen, Air Force Research Lab. (United States)
Darryl Sanchez, Air Force Research Lab. (United States)
Troy Rhoadarmer, SAIC (United States)
Loretta Arguella, Boeing-LTS (United States)
Denis W. Oesch, SAIC (United States)
Deborah Fung, SAIC (United States)
Roger Petty, Boeing-LTS (United States)
Patrick Kelly, Air Force Research Lab. (United States)
R. Anthony Vincent, Air Force Research Lab. (United States)
Jeff Richey, Air Force Research Lab. (United States)

Published in SPIE Proceedings Vol. 7093:
Advanced Wavefront Control: Methods, Devices, and Applications VI
John D. Gonglewski; Richard A. Carreras; Troy A. Rhoadarmer, Editor(s)

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