28 July 2008 The Magdalena Ridge Observatory Interferometer: custom near-IR beamsplitter and AR coatings
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This report focuses on the design, application, and testing of custom beamsplitter and anti-reflection coatings for use in the Magdalena Ridge Observatory Interferometer (MROI) beam combiners. The coatings were designed in collaboration with Optical Surface Technologies, and the University of Cambridge. The fringe tracker and science combiners will operate across the J, H, and K bands. The coatings were designed to achieve three optical characteristics critical to optical interferometry: 1) minimized stress of the substrate (leading to induced wavefront errors), 2) high throughput, and 3) high visibilities in broadband unpolarized light. The AR coating has mean reflection losses of less than 0.5%. Beamsplitter coatings experienced visibility losses less than 1% due to group delay dispersion and s and p phase differences.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
E. K. Block, E. K. Block, C. A. Jurgenson, C. A. Jurgenson, D. F. Buscher, D. F. Buscher, C. A. Haniff, C. A. Haniff, J. S. Young, J. S. Young, M. J. Creech-Eakman, M. J. Creech-Eakman, A. Jaramillo, A. Jaramillo, R. Schmell, R. Schmell, "The Magdalena Ridge Observatory Interferometer: custom near-IR beamsplitter and AR coatings", Proc. SPIE 7013, Optical and Infrared Interferometry, 70133M (28 July 2008); doi: 10.1117/12.788229; https://doi.org/10.1117/12.788229

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