title: Focus Retrocollimated Interferometry for Long-Radius-of-Curvature Measurement.
abstract: Focus retrocollimated interferometry is described for measuring long radius of curvature (>/=1 m), and achievable accuracy is discussed. It is shown that this method can be applied to both concave and convex spherical surfaces and can provide measurement to accuracy of 0.01-0.1%.
authors: Y
authors: Y
authors: Xiang