ESPRESSO is a fiber feed ultrastable High Resolution Spectrograph designed to work in the Combined-Coudé focus of Very Large Telescopes (VLT). A high resolution (R~100000) and an ultra-high resolution (R~220000) mode will be available to collect the light coming of one VLT telescope. In addition, ESPRESSO has an observing mode which allows to collect light of 2, 3 or 4 VLT units. This mode can feed simultaneously the spectrograph using a 4x1 fiber combiner. In the combiner, the light from 4 octagonal fibers will be mixed when projected onto a square fiber, as a double scrambler device. Here it is presented the design, manufacture, integration and tests for the 4x1 combiner of the ESPRESSO Fiber Link.
Felix Gracia Temich, José Luis Rasilla, Sergio Salata, Francesco Pepe, Gerardo Avila, Denis Mégevand, Rafael Rebolo, and Marco Riva, "Merging light beams from the 4 VLT telescopes," Proc. SPIE 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III, 1070628 (Presented at SPIE Astronomical Telescopes + Instrumentation: June 15, 2018; Published: 10 July 2018); https://doi.org/10.1117/12.2312032.
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