The WIYN One Degree Imager optical design

George H. Jacoby; Charles Harmer; Daniel Harbeck; Gary Muller; Daniel Blanco; Joseph Keyes; John Cavin

doi:10.1117/12.789998

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11 July 2008 The WIYN One Degree Imager optical design

George H. Jacoby, Charles Harmer, Daniel Harbeck, Gary Muller, Daniel Blanco, Joseph Keyes, John Cavin

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Proceedings Volume 7014, Ground-based and Airborne Instrumentation for Astronomy II; 70144S (2008) https://doi.org/10.1117/12.789998
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

The main advantage of the WIYN One Degree Imager (ODI) over other wide-field imagers will be its exceptional image quality. The fine pixel scale (0.11") provides uncompromised sampling of stellar PSFs under most conditions (seeing >0.3"). The telescope routinely delivers the site seeing (median ~ 0.7") which is often below 0.5" FWHM, and can be as low as 0.25". The ODI specifications require the optics to maintain native high quality images. A two-element, fused silica, corrector meets the geometric error budget of 0.10" images, but the first element requires a mildly aspheric surface. The other element serves as the dewar window. A pair of cemented prisms (fused silica plus PBL6Y) serve as an ADC, which is essential to meet the image quality requirements for many observing programs. We describe the optical design details and its performance, the tolerances required, and the trade-offs considered for anti-reflection coatings. This paper is an update to a preliminary three-element design.

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George H. Jacoby, Charles Harmer, Daniel Harbeck, Gary Muller, Daniel Blanco, Joseph Keyes, and John Cavin "The WIYN One Degree Imager optical design", Proc. SPIE 7014, Ground-based and Airborne Instrumentation for Astronomy II, 70144S (11 July 2008); https://doi.org/10.1117/12.789998

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