title: Atom interferometry in an optical cavity.
abstract: We propose and demonstrate a new scheme for atom interferometry, using light pulses inside an optical cavity as matter wave beam splitters. The cavity provides power enhancement, spatial filtering, and a precise beam geometry, enabling new techniques such as low power beam splitters (<100  μW), large momentum transfer beam splitters with modest power, or new self-aligned interferometer geometries utilizing the transverse modes of the optical cavity. As a first demonstration, we obtain Ramsey-Raman fringes with >75% contrast and measure the acceleration due to gravity, g, to 60  μg/sqrt[Hz] resolution in a Mach-Zehnder geometry. We use >10(7) cesium atoms in the compact mode volume (600  μm 1/e(2) waist) of the cavity and show trapping of atoms in higher transverse modes. This work paves the way toward compact, high sensitivity, multiaxis interferometry.
authors: Department of Physics, University of California, Berkeley, California 94720, USA.
authors: Paul
authors: P
authors: Hamilton
authors: Department of Physics, University of California, Berkeley, California 94720, USA.
authors: Matt
authors: M
authors: Jaffe
authors: Department of Physics, University of California, Berkeley, California 94720, USA.
authors: Justin M
authors: JM
authors: Brown
authors: Department of Physics, University of California, Berkeley, California 94720, USA.
authors: Lothar
authors: L
authors: Maisenbacher
authors: Department of Physics, University of California, Berkeley, California 94720, USA.
authors: Brian
authors: B
authors: Estey
authors: Department of Physics, University of California, Berkeley, California 94720, USA.
authors: Holger
authors: H
authors: Müller