Demonstration of a white light interferometer using fast light

Abstract

This paper presents the first demonstration of a white-light-cavity in a free-space cavity. Design of a whitelight-cavity has been proposed using negative dispersion in an intra-cavity medium to make the cavity resonate over a large range of frequencies and still maintain a high cavity build-up. The negative dispersion of the intra-cavity medium is caused by bi-frequency Raman gain in an atomic vapor cell. A significantly broad cavity response over a bandwidth greater than 20 MHz has been observed.