Invited Talk: Multi-photon Atom Interferometry via cavity-enhanced Bragg Diffraction

D. O. Sabulsky¹, J. Junca ¹, X. Zou¹, A. Bertoldi¹, M. Prevedelli², Q. Beaufils³, R. Geiger³, A. Landragin³, P. Bouyer¹, and B. Canuel¹
(MIGA Consortium)

¹ LP2N, Laboratoire Photonique, Numérique et Nanosciences, Université Bordeaux-IOGS-CNRS:UMR 5298, rue F. Mitterrand, F-33400 Talence, France
² Dipartimento di Fisica e Astronomia, Universita di Bologna, Via Berti-Pichat 6/2, I-40126 Bologna, Italy
³ LNE-SYRTE, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, 61 avenue de l´Observatoire, F-75014 Paris, France
(Dated: August 22, 2022)

We present our horizontal multi-photon atom interferometer driven via Bragg diffraction enhanced in an optical resonator. A large interrogation mode (4 mm 1/e² diameter) is necessary in such a system, as the atoms cross the interrogation region with a ballistic trajectory. This large mode is achieved using an 80 cm degenerate cavity to mediate the light-matter interaction. Using a sub-Doppler cooled ⁸⁷Rb source, we observe momentum transfer up to 8ℏk and demonstrate inertial sensitivity using significantly reduced optical power (<1 mW), taking advantage of the optical gain of the cavity. Our method is applicable to a vast class of measurement geometries and atomic source – we open a new perspective not only for the realization of high sensitivity multi-axis inertial atom sensors, but also for the future realization of hybrid atom/optical gravitational wave detectors.