Compensation analysis of a rotationally shearing interferometer using exact ray trace

Enoch Gutierrez-Herrera; Marija Strojnik; Gonzalo Paez

doi:10.1117/12.798999

3 September 2008 Compensation analysis of a rotationally shearing interferometer using exact ray trace

Enoch Gutierrez-Herrera, Marija Strojnik, Gonzalo Paez

Proceedings Volume 7082, Infrared Spaceborne Remote Sensing and Instrumentation XVI; 708210 (2008) https://doi.org/10.1117/12.798999
Event: Optical Engineering + Applications, 2008, San Diego, California, United States

Abstract

We are interested in designing, fabricating and characterizing a Dove prism for interferometric use. In a previous work, we determined the prism tolerance to manufacturing errors. When the manufacturing tolerance of the angles is maintained within ± 0.35 arc sec, the maximum wave-front deviation is better than λ/10 (at 633 nm). Afterward, we studied the optical (angular) and the error-induced misalignments, caused by an interferometric Dove prism. The misalignment analysis showed that to ensure a maximum OPD of λ/10 (at 633 nm) the tolerance to misalignment must be ± 0.33 arc sec. In this work, we analyze the mirror movements in a Rotationally-Shearing Interferometer to reach a performance better than λ/10 (at 633 nm), employing exact ray trace. The compensation study shows the presence of a 0.66 arc sec window needed to ensure such performance. In addition, we demonstrate that it is possible to reduce the wave-front deviation caused by manufacturing errors of the interferometric Dove prism, by implementing fine mirror movements. The analysis illustrates that a piezoelectric might be used to control the mirror mounts, thus ensuring the desired performance.

Citation Download Citation

Enoch Gutierrez-Herrera, Marija Strojnik, and Gonzalo Paez "Compensation analysis of a rotationally shearing interferometer using exact ray trace", Proc. SPIE 7082, Infrared Spaceborne Remote Sensing and Instrumentation XVI, 708210 (3 September 2008); https://doi.org/10.1117/12.798999

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