Non-Contact Measurements Of Refractive Index And Surface Curvature

Donald C O'Shea; Shawn A. Tilstra

doi:10.1117/12.948062

29 January 1989 Non-Contact Measurements Of Refractive Index And Surface Curvature

Donald C O'Shea, Shawn A. Tilstra

Proceedings Volume 0966, Advances in Fabrication and Metrology for Optics and Large Optics; (1989) https://doi.org/10.1117/12.948062
Event: 32nd Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1988, San Diego, CA, United States

Abstract

A simple system geometry using a low power laser has been designed to measure the surface curvature of a lens or a mirror or the refractive index of a slab of a transparent material by using the Fresnel reflection from its surfaces. By comparing our measurements of the surface curvature to those using a precision spherometer, we found this method accurate to ±0.1 mm for curvatures from 25 to 75 mm. If the thickness of a parallel plate can be measured, this technique can determine the refractive index of the plate without resorting to demounting or cutting a sample to be measured. Measurements of fused and crystalline quartz flats determined the refractive indices of the samples to ±0.001. The application of this technique to in situ measurements of optical systems and its limitations will be discussed.

Citation Download Citation

Donald C O'Shea and Shawn A. Tilstra "Non-Contact Measurements Of Refractive Index And Surface Curvature", Proc. SPIE 0966, Advances in Fabrication and Metrology for Optics and Large Optics, (29 January 1989); https://doi.org/10.1117/12.948062

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