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Proceedings Paper

IMAKA: imaging from MAuna KeA optical design
Author(s): Clinton Evans; Hua Lin; Ashley McColgan; Neil Rowlands; Derrick Salmon
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Paper Abstract

The 'IMAKA (Imaging from MAuna KeA) instrument is a wide field visible light imager incorporating Ground Layer Adaptive Optics (GLAO) to take maximum advantage of the excellent seeing available at the Canada-France-Hawaii Telescope (CFHT). It requires better than 0.3" image quality simultaneously over a total field of view of approximately one square degree (~3 x 10-4 sr). This requirement along with other criterions and constraints raises a challenge for optical design. The advent of orthogonal transfer (OT) CCDs allows the tip-tilt portion of the atmospheric correction to be performed at the science detector itself. 'IMAKA will take full advantage of the large array mosaics of OTCCDs. Since the size of the adaptive mirror would drive the cost and hence implementation of the overall 'IMAKA instrument, a review of possible optical design configurations which minimize the size (diameter) of the deformable mirror is undertaken. A promising design was obtained and developed in more detail. This all reflective system is described along with its predicted optical performance. An opto-mechanical design concept was developed around this nominal optical design which takes into account various constraints due to its required location on the top end of the Canada France Hawaii Telescope. The design concept is feasible and meets the optical performance requirements.

Paper Details

Date Published: 20 July 2010
PDF: 14 pages
Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 773537 (20 July 2010); doi: 10.1117/12.857285
Show Author Affiliations
Clinton Evans, COM DEV International Ltd. (Canada)
Hua Lin, COM DEV International Ltd. (Canada)
Ashley McColgan, COM DEV International Ltd. (Canada)
Neil Rowlands, COM DEV International Ltd. (Canada)
Derrick Salmon, Canada-France-Hawaii Telescope Corp. (United States)


Published in SPIE Proceedings Vol. 7735:
Ground-based and Airborne Instrumentation for Astronomy III
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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