title: Interferometric measurement of the refractive-index gradient distribution in gradient-index optical blanks.
abstract: Anew interferometric method for measuring the refractive-index distribution in a plane-parallel section cut from a gradient-index lens blank is described. A standard double-pass interferometric scheme modified to provide a single pass of the beam through the investigated gradient-index sample is used. The two-dimensional variation of the refractive index in dimensions transverse to the sample surface is measured with an accuracy of better than 1 × 10(-4).
authors.forename: L A
authors.initials: LA
authors.lastname: Gerasimova