Mr. Daniel E. Green Profile

Daniel E. Green

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Proceedings Article | 11 November 1999 Paper

Polished homogeneity testing of Corning fused silica boules

Andrew Fanning, Joseph Ellison, Daniel Green

Proceedings Volume 3782, (1999) https://doi.org/10.1117/12.369224

KEYWORDS: Polishing, Silica, Wavefronts, Surface finishing, Interferometers, Reflection, Time metrology, Refraction, National Ignition Facility, Interferometry

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Interferometrically measuring the index of refraction variation (index homogeneity) of glass blanks requires that the blanks be made transparent to the interferometer laser. One method for achieving this is to 'sandwich' a rough ground blank between two polished flats while adding an index matching liquid at each surface interface. This is better known as oil-on-flat (OOF) or oil-on-plate testing. Another method requires polishing both surfaces and is better known as polished homogeneity (PHOM) testing or the Schwider method. Corning Inc. historically has used OOF testing to measure the index homogeneity of disk-shaped, fused silica boules over multiple 18' diameter apertures. Recently a boule polishing and PHOM testing process was developed by Corning for measuring the homogeneity over 24' diameter apertures to support fused silica production for the National Ignition Facility (NIF). Consequently, the PHOM technique has been compared to the OOF process using a number of different methods including repeatability/reproducibility studies, data stitching, and vibration analysis. The analysis performed demonstrates PHOM's advantages over OOF testing.

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