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11 July 2018 PPPP: an on-sky experiment for zero-cone effect LGS alternative
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PPPP, Pupil Plane Projected Pattern, is a LGS alternative (described more fully in the paper by Yang, this meeting #10703-26) which is inherently free of focal anisoplanatism. It has other practical and scientific advantages, but it is the disadvantages that this paper concentrates on since they are foremost when considering a real implementation. An on-sky test of the technique is funded and here we describe progress in solving the fundamental questions for any new technique: how to actually do it at a real telescope? Our targeted platform is a Nasmyth platform of the 4.2m WHT on La Palma. We discuss the difficulties of projecting an afocal beam from the primary mirror without causing excessive back-reflections/-scatter, which drowns the beam-profile, and instead suggest two alternative experiments. By splitting the validation of PPPP on-sky into two parts, each experiment can address a separate aspect of the validation without the disadvantage of trying to “do it all” within one experiment.
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Nazim A. Bharmal, Richard M. Myers, and Huizhe Yang "PPPP: an on-sky experiment for zero-cone effect LGS alternative", Proc. SPIE 10703, Adaptive Optics Systems VI, 1070362 (11 July 2018); doi: 10.1117/12.2313166;

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