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A: Fachverband Atomphysik

A 7: Präzisionsmessungen und Metrologie 3

A 7.8: Vortrag

Montag, 12. März 2012, 18:15–18:30, V7.03

Towards Testing General Relativity with a dual species interferometer — •Jonas Hartwig, Dennis Schlippert, Ulrich Velte, Daniel Tiarks, Sven Ganske, Olga Lysov, Ernst Maria Rasel, and Wolfgang Ertmer — Institut für Quantenoptik, Hannover, Germany

We report on our work directed towards a dual species matter-wave interferometer for performing a differential measurement of the acceleration of free falling ⁸⁷Rb and ³⁹K atoms to test Einstein’s equivalence principle (universality of free fall). Based on minimal Standard Model Extension calculations this combination of elements is very sensitive for composition based equivalence principle violating effects.

During free fall, a Mach-Zehnder type interferometry sequence employing stimulated Raman transitions is applied synchronously for both species, achieving high common noise rejection. With an expected single shot resolution of ∼5×10⁻⁸g the apparatus will allow for studying systematics at a level of few parts in 10⁹g after 100 s integration time.

To guarantee well defined starting conditions the two species will be trapped in an optical dipole trap formed by an Fiber Laser of 1960 nm wavelength. The special properties of this dipole trap allow for fast and efficient cooling. Also, use of evaporative and/or sympathetic cooling techniques is possible.

We will show the enviromental noise limited performance of the single species Rubidium gravimeter and the progress in the implementation of the Potassium Interferometer.