The Magdalena Ridge Observatory Interferometer: custom near-IR beamsplitter and AR coatings

E. K. Block; C. A. Jurgenson; D. F. Buscher; C. A. Haniff; J. S. Young; M. J. Creech-Eakman; A. Jaramillo; R. Schmell

doi:10.1117/12.788229

28 July 2008 The Magdalena Ridge Observatory Interferometer: custom near-IR beamsplitter and AR coatings

E. K. Block, C. A. Jurgenson, D. F. Buscher, C. A. Haniff, J. S. Young, M. J. Creech-Eakman, A. Jaramillo, R. Schmell

Proceedings Volume 7013, Optical and Infrared Interferometry; 70133M (2008) https://doi.org/10.1117/12.788229
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

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.

Citation Download Citation

E. K. Block, C. A. Jurgenson, D. F. Buscher, C. A. Haniff, J. S. Young, M. J. Creech-Eakman, A. Jaramillo, and 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); https://doi.org/10.1117/12.788229

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