Senarmont's and Turdy's Compensator for All Visible Light

Abstract

A composite quarter-wave plate has been made up of two sheets of phase plate. It is discussed how the composite quarter-wave plate transforms a state of polarized light by using Müller's matrix, Stokes' parameter and Poincaré sphere. Instead of the quarter-wave plate, the composite quarter wave plate can be used for Sénarmont's and Turdy's compensator. That can make it possible to measure retardation of samples for all visible light. Good results of experimental data are obtained.