Abstract
A detailed investigation of the performance of the Fresnel rhomb is given, particular attention being paid to the effect of residual stress birefringence in the rhomb material and of films on the surfaces at which total internal reflection occurs. For glass and silica rhombs good agreement has been obtained between experimental results and theoretically computed phase retardations. The possibility of producing an achromatic quarter-wave system by depositing thin dielectric films on the reflecting surfaces of the rhomb is explored, measurements showing that the variation in phase retardation through the visible spectrum and near ultra-violet extending down to a wavelength of 330 nm can be kept to less than 0.4°.
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