Zerodur polygon mirrors with four to 36 faces are now available from Rolyn Optics Co. The mirrors feature face-to-face accuracy of 1 arc sec, pyramidal error of 90 (±3) arc sec or better, and l/10 flatness. The width across, depending on the number of faces, ranges from 10 to 150 mm (±0.05 mm), axial thickness varies from 5 to 50 mm (±0.25 mm) and center holes range from 10 to 80 mm (±0.05 mm) in diameter. The faces are aluminized.

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