Adaptive optics with the deformable mirror not in pupil: Part I. Experimental results

Details Adaptive optics with the deformable mirror not in pupil: Part I. Experimental results Adaptive optics with the deformable mirror not in pupil: Part I. Experimental results

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008spie.7093e...6m&link_type=abstract

Advanced Wavefront Control: Methods, Devices, and Applications VI. Edited by Gonglewski, John D.; Carreras, Richard A.; Rhoadar

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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".

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