On Fabry–Pérot Etalon-based Instruments. I. The Isotropic Case

This work has been supported by the Spanish Ministry of Economy and Competitiveness through projects ESP2014-56169-C6-1-R and ESP-2016-77548-C5-1-R and by Spanish Science Ministry >Centro de Excelencia Severo Ochoa> Program under grant SEV-2017-0709. D.O.S. also acknowledges financial support through the Ramon y Cajal fellowship.