Transmission and opto-mechanical performance of the liquid lens coupling in the Robert Stobie Spectrograph on SALT

Ockert J. Strydom; Éric Depagne; Darragh O'Donoghue; Martin Wilkinson; Wouter Lochner; Jonathan Love; Lisa Crause; Janus Brink; Kenneth H. Nordsieck; J. Alan Schier

doi:10.1117/12.2232243

22 July 2016 Transmission and opto-mechanical performance of the liquid lens coupling in the Robert Stobie Spectrograph on SALT

Ockert J. Strydom, Éric Depagne, Darragh O'Donoghue, Martin Wilkinson, Wouter Lochner, Jonathan Love, Lisa Crause, Janus Brink, Kenneth H. Nordsieck, J. Alan Schier

Author Affiliations +

Proceedings Volume 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II; 99123D (2016) https://doi.org/10.1117/12.2232243
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

Liquid lens coupling provides excellent transmission efficiency when compared to multilayer coatings especially for applications where broadband transmission is required. However, long term reliability of liquid coupling is difficult to achieve. This is typically due to chemical compatibility issues affecting both the optical transmission and the integrity of the opto-mechanical support. As part of a recent service of the Robert Stobie Spectrograph on SALT we had the opportunity to study these problems further and in this paper we provide analysis of problems identified and some solutions to prevent them. We also present general guidelines which could aid future opto-mechanical designs for liquid coupling of lenses.

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Ockert J. Strydom, Éric Depagne, Darragh O'Donoghue, Martin Wilkinson, Wouter Lochner, Jonathan Love, Lisa Crause, Janus Brink, Kenneth H. Nordsieck, and J. Alan Schier "Transmission and opto-mechanical performance of the liquid lens coupling in the Robert Stobie Spectrograph on SALT", Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 99123D (22 July 2016); https://doi.org/10.1117/12.2232243

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