RT Journal Article T1 Optimal achromatic wave retarders using two birefringent wave plates A1 Vilas Prieto, José Luis A1 Sánchez Brea, Luis Miguel A1 Bernabeu Martínez, Eusebio AB Two plates of different birefringence material can be combined to obtain an achromatic wave retarder. In this work, we achieve a correction for the overall retardation of the system that extends the relation to any azimuth. Current techniques for the design of achromatic wave retarders do not present a parameter that characterizes its achromatism on a range of wavelengths. Thus, an achromatic degree has been introduced, in order to determine the optimal achromatic design composed with retarder plates for a spectrum of incident light. In particular, we have optimized a quarter retarder using two wave plates for the visible spectrum. Our technique has been compared to previous results, showing significant improvement. PB The Optical Society Of America SN 1559-128X YR 2013 FD 2013-03-20 LK https://hdl.handle.net/20.500.14352/33596 UL https://hdl.handle.net/20.500.14352/33596 LA eng NO © 2013 Optical Society of America.This work was supported by the project “Photonic Transceiver for Secure Communications Space” of the European Space Agency with Tecnológica Ingeniería, Calidad y Ensayos, and by project DPI2011-27851 of the Ministerio de Ciencia e Innovacion of Spain. NO Agencia Espacial Europea (ESA) NO Tecnológica Ingenieria Calidad y Ensayos (España) NO Ministerio de Ciencia e Innovación (MICINN), España DS Docta Complutense RD 21 abr 2025