The polarization aberrations of a fold mirror can be compensated by orienting a second fold mirror’s -polarization with the first mirror’s -polarization. This crossed-mirror configuration compensates the polarization for a single angle to zero and leaves a linear variation of diattenuation and retardance for a spherical wavefront. Two sets of crossed fold mirrors when properly oriented compensate the remaining linear variation and leave a much reduced quadratic variation in a large compensated field of view.
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