This interferometer is designed to measure 75 by 40 cm laser glass. The entire surface is measured at a Brewster's angle, 56.57 degrees, with an s-polarization beam. The reflected beam is retro-reflected by a highly reflective mirror. Thus, a 75 by 40 cm surface can be tested with a 60-cm aperture. The most troublesome problem is the ghost reflection from the rear surface of a flat while the front surface is being measured. After the second surface is polished to ensure the transmitted wavefront quality, not the quality of the surface itself. Therefore, the second surface does not need to be measured directly. To avoid reflection from both surfaces, the laser is switched to a p-polarization after the first surface is measured while the flat is still at a Brewster's angle. Thus, the transmitted wavefront is not affected by the reflection. We believe that a 60-cm clear aperture, Fizeau phase-shifting interferometer is the most practical and accurate instrument for testing 75 by 40 cm optical flats. In this paper, we briefly summarize the important design factors, and show in theory that the design can meet the required performance.
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