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This document constitutes a specification for a first order, two component,quarter wave retardation plate. The assembly consists of two nominally plane parallel plates of crystal quartz whose axes are nominally at an angles of 90 to one other and nominally parallel to the entrance face of one of the componets. The assembly will be air spaced with pn 632-5 or equivalent and edge cemented. 2. Deviation of a transmitted beam of 632.8nm light normal to polished surface. Filling the clear aperture , shall not exceed 30 second arc. 3. Optical material for component elements is crystalline quartz that satisfied striae grade a specification per 632-4. 4.Polarization characteristics as defined in 632-1 paragraph 2. Leakage shall not exceed 0.3%. Retardance shall satisfy the condition 0.25<R<0.25 waves at 632nm. All tests performed over the clear aperture and in collimated light at normal incidence. 5. 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