MIGA will be a new, hybrid detector that couples laser and matter-wave interferometry to study sub Hertz variations of the strain tensor of space-time and gravitation. Using a novel approach exploiting a set of atomic interferometers simultaneously manipulated by the resonant optical field of a 200m cavity, this instrument will allow at the same time a better understanding of the evolution of the gravitational field and a new tool for gravitational waves (GW) detection. The experimental concept of MIGA relies on matter wave interferometry, where a dilute ensemble of cold atoms in free fall accrue phase shifts by the application of beamsplitter and mirror laser pulses building up an interferometer roughly analogous to an optical Mach-Zehnder interferometer.
MIGA - Matter-wave laser Interferometer Gravitation Antenna
At the LP2N in Talence (France), we are working on a prototype to study cavity enhanced atom interferometry with Bragg pulses and Large Momentum Transfer (LMT) thanks to the power build up in the optical cavities.
It consists of a single atom interferometer interrogated by two L = 80 cm long cavities. Atoms (Rubidium 87) are first cooled in two dimensions with a 2D Magneto-Optical Trap (MOT) to load a 3D MOT. They are launched from the 3D MOT on a vertical trajectory using a frequency shift between the upper and lower cooling beams where they experience a sub Doppler cooling to reach a temperature of few μK. A velocity and magnetic selection is performed by 2 Raman pulses. At the apex of their trajectory the atoms enter to the interferometer area where they are interrogated by a π/2 − π − π/2 cavity enhanced Bragg pulses sequence. On their way down, the atoms pass through the detection system, where the populations of both states involved in the interferometer are detected by fluorescence.
The waist of the in-cavity Bragg beams needs to be of the order of several mm to interrogate efficiently the cold-atom clouds and obtain a high interference contrast. To achieve such a large waist in a stable 80-cm-long cavity, we opted for a marginally stable resonator geometry with two plan mirrors located at the focal f = 40 cm point of a biconvex lens which magnifies the beam size at the cavity input.
MIGA - Team Members
Characterizing Earth gravity field fluctuations with the MIGA antenna for future Gravitational Wave detectors, J. Junca, A. Bertoldi, D. O. Sabulsky, G. Lefèvre, X. Zou, J. -B. Decitre, R. Geiger, A. Landragin, S. Gaffet, P. Bouyer, B. Canuel, arXiv:1902.05337
Exploring gravity with the MIGA large scale atom interferometer, B. Canuel, A. Bertoldi, L. Amand, E. Borgo di Pozzo, B. Fang, R. Geiger, J. Gillot, S. Henry, J. Hinderer, D. Holleville, G. Lefèvre, M. Merzougui, N. Mielec, T. Monfret, S. Pelisson, M. Prevedelli, S. Reynaud, I. Riou, Y. Rogister, S. Rosat, E. Cormier, A. Landragin, W. Chaibi, S. Gaffet, P. Bouyer, Nature Scientific Reports 8, 14064 (2018) arXiv:1703.02490
Watt-level single-frequency tunable neodymium MOPA fiber laser operating at 915-937 nm, S. Rota-Rodrigo, B. Gouhier, M. Laroche, J. Zhao, B. Canuel, A. Bertoldi, P. Bouyer, N. Traynor, B.Cadier, T. Robin, G. Santarelli, Opt. Lett. 42, 4557-4560 (2017) arXiv:1711.07236
Studies of general relativity with quantum sensors, G. Lefevre, G. Condon, I. Riou, L. Chichet, M. Essayeh, M. Rabault, L. Antoni-Micollier, N. Mielec, D. Holleville, L. Amand, R. Geiger, A. Landragin, M. Prevedelli, B. Barrett, B. Battelier, A. Bertoldi, B. Canuel, P. Bouyer, to appear in "Proceedings of the 52nd Rencontres de Moriond on Gravitation". arXiv:1705.10475
Atom interferometry in a marginally stable optical resonator, I. Riou, N. Mielec, G. Lefèvre, M. Prevedelli, A. Landragin, P. Bouyer, A. Bertoldi, R. Geiger, and B. Canuel, Journal of Physics B: Atomic, Molecular and Optical Physics, Volume 50, Number 15 (2017). arXiv:1701.01473
MIGA: Combining laser and matter wave interferometry for mass distribution monitoring and advanced geodesy, B. Canuel, S. Pelisson, L. Amand, A. Bertoldi, E. Cormier, B. Fang, S. Gaffet, R. Geiger, J. Harms, D. Holleville, A. Landragin, G. Lefèvre, J. Lhermite, N. Mielec, M. Prevedelli, I. Riou, P. Bouyer, Proceedings of SPIE Photonics Europe conference, Brussels (Belgium), 3-7 April 2016. arXiv:1604.02072
Low frequency gravitational wave detection with ground-based atom interferometer arrays, W. Chaibi, R. Geiger, B. Canuel, A. Bertoldi, A. Landragin, and P. Bouyer, Phys. Rev. D 93, 021101(R) (2016). arXiv:1601.00417
Matter-wave laser Interferometric Gravitation Antenna (MIGA): New perspectives for fundamental physics and geosciences, R. Geiger, L. Amand, A. Bertoldi, B. Canuel, W. Chaibi, C. Danquigny, I. Dutta, B. Fang, S. Gaet, J. Gillot, D. Holleville, A. Landragin, M. Merzougui, I. Riou, D. Savoie, P. Bouyer, Proceedings of the 50th Rencontres de Moriond "100 years after GR", La Thuile (Italy), 21-28 March 2015. arXiv:1505.07137
The matter-wave laser interferometer gravitation antenna (MIGA): New perspectives for fundamental physics and geosciences, B. Canuel, L. Amand, A. Bertoldi, W. Chaibi, R. Geiger, J. Gillot, A. Landragin, M. Merzougui, I. Riou, S. P. Schmid, and P. Bouyer, Proceedings of i-DUST 2014, E3S Web of Conferences 4, 01004 (2014).
MIGA Newletter, Issue No. 1, August 2015 with a highlight on first atom head installed at LP2N by the SYRTE team