Cementing and testing of the 4MOST WFC/ADC doublets

Graeme Jonas; Abe Romeril; Dave Cochrane; Dijana Bogunović; Damien Jones; Samuel C. Barden; Joar Brynnel

doi:10.1117/12.2561953

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13 December 2020 Cementing and testing of the 4MOST WFC/ADC doublets

Graeme Jonas, Abe Romeril, Dave Cochrane, Dijana Bogunović, Damien Jones, Samuel C. Barden, Joar Brynnel

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Proceedings Volume 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV; 114513A (2020) https://doi.org/10.1117/12.2561953
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

The 4-meter Multi-Object Spectroscopic Telescope (4MOST) is a wide-ﬁeld, high-multiplex spectroscopic survey facility under development for the Visible and Infrared Survey Telescope for Astronomy (VISTA) of the European Southern Observatory (ESO). The 4MOST Wide Field Corrector and Atmospheric Dispersion Corrector (ADC) lenses have been manufactured and tested at KiwiStar Optics, New Zealand. The two ADC wedged doublets form a Risley Prism Pair; are both 650 mm in diameter and relatively thin; and have been cemented using Sylgard 184 silicone elastomer. The cementing procedure and its challenges are reported here. Interferometric measurements of the single surfaces, glass blanks and the ﬁnished doublets have been compared in order to assess the eﬀect of the cementing process on the ﬁnal surface ﬁgures of the doublets before and after positioning in their cells.

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Graeme Jonas, Abe Romeril, Dave Cochrane, Dijana Bogunović, Damien Jones, Samuel C. Barden, and Joar Brynnel "Cementing and testing of the 4MOST WFC/ADC doublets", Proc. SPIE 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV, 114513A (13 December 2020); https://doi.org/10.1117/12.2561953

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