Design of the KOSMOS oil-coupled spectrograph camera lenses

Thomas P. O'Brien; Mark Derwent; Paul Martini; Gary Poczulp

doi:10.1117/12.2053594

28 July 2014 Design of the KOSMOS oil-coupled spectrograph camera lenses

Thomas P. O'Brien, Mark Derwent, Paul Martini, Gary Poczulp

Proceedings Volume 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation; 915141 (2014) https://doi.org/10.1117/12.2053594
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

Abstract

We present the design details of oil-coupled lens groups used in the KOSMOS spectrograph camera. The oil-coupled groups use silicone rubber O-rings in a unique way to accurately center lens elements with high radial and axial stiffness while also allowing easy assembly. The O-rings robustly seal the oil within the lens gaps to prevent oil migration. The design of an expansion diaphragm to compensate for differential expansion due to temperature changes is described. The issues of lens assembly, lens gap shimming, oil filling and draining, bubble mitigation, material compatibility, mechanical inspection, and optical testing are discussed.

Citation Download Citation

Thomas P. O'Brien, Mark Derwent, Paul Martini, and Gary Poczulp "Design of the KOSMOS oil-coupled spectrograph camera lenses", Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 915141 (28 July 2014); https://doi.org/10.1117/12.2053594

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