title: Demonstration of a tunable-bandwidth white-light interferometer using anomalous dispersion in atomic vapor.
abstract: Recently, the design of a white-light cavity has been proposed using negative dispersion in an intracavity medium to make the cavity resonate over a large range of frequencies and still maintain a high cavity buildup. This Letter presents the first demonstration of this effect in a free-space cavity. The negative dispersion of the intracavity medium is caused by bifrequency Raman gain in an atomic vapor cell. A significantly broad cavity response over a bandwidth greater than 20 MHz has been observed. A key application of this device would be in enhancing the sensitivity-bandwidth product of the next generation gravitational wave detectors that make use of the so-called signal-recycling mirror.
authors.affiliation: Department of EECS, Northwestern University, Evanston, Illinois 60208, USA.
authors.forename: G S
authors.initials: GS
authors.lastname: Pati
authors.forename: M
authors.initials: M
authors.lastname: Salit
authors.forename: K
authors.initials: K
authors.lastname: Salit
authors.forename: M S
authors.initials: MS
authors.lastname: Shahriar