REFRACTIVE INDEX DISTRIBUTION MEASUREMENT METHOD, REFRACTIVE INDEX DISTRIBUTION MEASUREMENT DEVICE, AND OPTICAL ELEMENT MANUFACTURING METHOD

摘要

PROBLEM TO BE SOLVED: To measure the refractive index distribution of a lens to be inspected with high accuracy.;SOLUTION: A first reference lens 120 whose shape and refractive index are known and the first surface of a lens 60 be inspected are brought closer and a first interference fringe is measured, a second reference lens 125 whose shape and refractive index are known and the second surface of the lens 60 be inspected are brought closer and a second interference fringe is measured, and the transmission wavefront of the light having passed through the first reference lens 120, the lens 60 to be inspected, and the second reference lens 125. The shape of the first surface of the lens 60 be inspected is calculated from the first interference fringe, the shape of the second surface of the lens 60 be inspected is calculated from the second interference fringe, and the refractive index distribution of the lens 60 to be inspected is calculated using the refractive index of the first reference lens 120, the refractive index of the second reference lens 125, and the shapes of first and second surfaces and the transmission wavefront of the lens 60 to be inspected.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2016,JPO&INPIT