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閔勝圭,玄在慶 慶熙大學校 1991 論文集 Vol.20 No.-
The achromatic 90˚ and 180˚ phase retarder devices are designed that are made of three right-angle prisms cemented together. These devices exploit the upon total internal reflections at the reflecting surfaces of prisms. The light beam is totally internally reflected four times, and input and output beams maintain collinearity. It is seen that neither the usual FK-3 prisms nor the BK-7 prisms yield 90˚ and 180˚ phase retardation. However, if the reflecting surfaces are coated with suitable dielectric thin films, achromatic phase shifts of the magnitude desired can be obtained. MgF_2 and ZnS are used as low and high refractive-index film materials in the computations. The optimum MgF_2 and ZnS layer thicknesses are obtained by minimizing the standard donation. In the case of BK-7 device, if only one surface is coated with an optimal thickness of 15.63 nm ZnS 67.53 nm MgF_2, a standard deviation of 1.66˚ is obtained over the wavelength range 405-707 nm. In the case of FK-3 device, if all four surfaces are coated, it is necessary to use a MgF_2 layer of 54.4 nm for each surface to obtain a minimum in the standard deviation of 0.61˚ over the wavelength range 405-707 nm.