15 Avril – Thesis defense - Joseph Junca

16 h Auditorium - Institut Optique d'Aquitaine (Talence)

Progress of the MIGA project toward gravity strain measurements with atom interferometry.

The MIGA project lies at the crossroad between atomic physics and gravitational wave astronomy. Based on atom interferometry, this ambitious project aims at building a gravity strainmeter underground in the low noise laboratory LSSB. Immersed in a facility dedicated to geophysics, MIGA will complement the sensor network already deployed on site as well as being a test bench to study the feasibility of building a low frequency gravitational wave detector based on atom interferometry.
This manuscript presents theoretical and experimental works, more or less independent, that bring understanding to the whole project.
We first estimate the amplitude of gravity strain to be expected on the building site and study their detectability by the MIGA instrument.
We then present the functioning of the core of the instrument that is a $^{87}$Rb cold atom source and its laser system and their experimental characterization.
Taking advantage of the atom source capabilities, the last part of the manuscript demonstrates Bragg interferometry inside a wide waist optical resonator.

Event localization