Letter refractive index variation measurements of fluids using common-path Zeeman interferometry

Abstract

A common-path Zeeman interferometry technique has been deveioped and applied for the measurements of refractive index gradients of the fluids to an accuracy of Δn=9.4 × 10⁻⁹. The Zeeman interferometry technique has over 100 times better resolution than the other interferometry techniques. A linear refractive index profile of the solution at the interface of the growing L-arginine phosphate crystal from solution was measured successfully using a scanning Zeeman interferometry technique.