Design of a 24-in. phase shifting Fizeau interferometer

Chiayu Ai; Robert E. Knowlden; Joseph A. Lamb

doi:10.1117/12.276334

17 July 1996 Design of a 24-in. phase shifting Fizeau interferometer

Chiayu Ai, Robert E. Knowlden, Joseph A. Lamb

Proceedings Volume 2860, Laser Interferometry VIII: Techniques and Analysis; (1996) https://doi.org/10.1117/12.276334
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

This interferometer is designed to measure 75x40 cm laser glass. The entire surface is measured at a Brewsters angle, 56.57°, with an s-polarization beam. The reflected beam is retro-reflected by a highly reflective mirror. Thus, a 75x40 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, both surfaces are reflective and their beams can interfere. However, the second surface of a flat is to be 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 75x40 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.

Citation Download Citation

Chiayu Ai, Robert E. Knowlden, and Joseph A. Lamb "Design of a 24-in. phase shifting Fizeau interferometer", Proc. SPIE 2860, Laser Interferometry VIII: Techniques and Analysis, (17 July 1996); https://doi.org/10.1117/12.276334

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