Adaptive Optics with the Deformable Mirror not in Pupil Part I: Experimental Results (Postprint)

Abstract : This is the first of two papers discussing aspects of placing the deformable mirror in location not conjugate to the pupil plane of the telescope. The Starfire Optical Range, Air Force Research Lab is in the process of developing a high efficiency AO system for its 3.5m 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 degradation in optical performance. This paper discusses experimental measurements of the degradation.