Berlin 2014 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 9: Matter wave optics II
Q 9.7: Talk
Monday, March 17, 2014, 15:30–15:45, DO26 208
Double Bragg Diffraction in a Matter Wave Interferometer with BECs — •Hauke Müntinga1, Claus Lämmerzahl1, and the QUANTUS Team1,2,3,4,5,6 — 1ZARM, U Bremen — 2LU Hannover — 3HU Berlin — 4U Hamburg — 5U Ulm — 6TU Darmstadt
Matter wave interferometers based on Bragg diffraction have recently gained momentum in comparison to Raman diffraction due to their ability to directly populate higher diffraction orders with a single laser pulse to scale sensitivity. In microgravity, the system becomes symmetric, and Double Diffraction occurs [1]: The atoms are at rest and interact with both beam pairs, thus three momentum states are coupled. This suppresses systematic effects from laser phase noise and makes Double Diffraction an interesting tool to investigate for precision measurements.
In this talk, we report on first ground based experiments carried out in the QUANTUS-I apparatus [2]: The laser beams are aligned perpendicular to gravity, and with a delta-kick cooled BEC a Mach-Zehnder type interferometer is created. A small gravitational acceleration is introduced resulting in a phase shift in the interferometer signal. We demonstrate scalability of the system by observing interference fringes with first order, sequential first order, and second order Bragg pulses. The QUANTUS project is supported by the German Space Agency DLR with funds provided by the Federal Ministry of Economics and Technology (BMWi) under grant number DLR 50WM1131-1137.
[1] Giese et al., PRA 88, 053608
[2] Müntinga, Ahlers, Krutzik, Wenzlawski et al., PRL 110, 093602