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Design of two delay lines for optical interferometers

This paper describes the designs of the delay lines constructed for the Mark III Optical Interferometer (M3OI) currently operating on Mt. Wilson and for the Infrared Optical Telescope Array (IOTA) to be constructed for Mt. Hopkins. Special attention is given to experience with M3OI which was used to improve the design of the IOTA system. Schematics are presented for the IOTA instrument layout, the IOTA coarse delay line, and the IOTA long delay line.