Null corrector design for white light scatterplate interferometry on a large conic surface

Rex M. Kremer; Brian J. DeBoo; Jose M. Sasian

doi:10.1117/12.449971

10 December 2001 Null corrector design for white light scatterplate interferometry on a large conic surface

Rex M. Kremer, Brian J. DeBoo, Jose M. Sasian

Proceedings Volume 4442, Novel Optical Systems Design and Optimization IV; (2001) https://doi.org/10.1117/12.449971
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

We present a method for designing and testing a null corrector for use with scatterplate interferometry on a large conic mirror. The null corrector in a scatterplate interferometer must maintain OPD of less than 1/2 wave over a finite field size for optimal fringe visibility. Our design uses an aspheric diamond-turned mirror (DTM) to exactly cancel out the spherical aberration of the surface under test. The DTM has the additional benefit of being useable in other types of interferometers for testing of the conic surface in a null condition. Low power refractive elements correct field aberrations over the finite aperture of the scatterplate. The null corrector can be certified using another smaller DTM or a computer generated hologram (CGH). This design has the advantages of being small in size, less expensive than designs using spherical surfaces (due to the small size of the null-correcting mirror), useable with other interferometers, and easy to align.

Citation Download Citation

Rex M. Kremer, Brian J. DeBoo, and Jose M. Sasian "Null corrector design for white light scatterplate interferometry on a large conic surface", Proc. SPIE 4442, Novel Optical Systems Design and Optimization IV, (10 December 2001); https://doi.org/10.1117/12.449971

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KEYWORDS

Mirrors

Aspheric lenses

Interferometry

Monochromatic aberrations

Light scattering

Interferometers

Spherical lenses

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