Academic paper

The Calibration System of the iLocater Spectrograph

Authors: Sai Vidyud Senthil Nathan, Jonathan Crass, Julia E. Brady, Mark Derwent, Marcelo Tala Pinto, Brian Sands, Jackson Datkuliak, Jonathan Shover, Christian Schwab, Julian St\"urmer, Stanimir O. Letchev, Jacob Pember, Jayde Spiegel, Erin Duell, Daniel Pappalardo, Marshall C. Johnson, Michael Engelman, Matheus J. Castro, Justin R. Crepp, Ondrej Kitzler, Thomas Legero, Xavier Lesley-Salda\~na, Richard Pogge, Dane Zielinski-NicolsonPublished: 2026-07-29Paper ID: 2607.27330Category: astro-ph.IMLicense: CC BY 4.0

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Abstract

iLocater is a new near-infrared, extreme precision radial velocity (EPRV) instrument delivered to the Large Binocular Telescope in the summer of 2026. The instrument utilizes single-mode fibers (SMFs) for light transmission, including its calibration systems. We present an overview of the iLocater calibration system, detailing the specific sources and the hardware required to inject calibration light into the SMFs. Furthermore, we discuss the hardware that efficiently switches between these sources and distributes the light to all necessary instrument locations, entirely eliminating the need for free-space propagation.

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