Hannover 2020 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 55: Matter Wave Optics

Q 55.7: Talk

Friday, March 13, 2020, 12:30–12:45, a310

Atomic Raman vs. Bragg diffraction in microgravity — •Sabrina Hartmann¹, Jens Jenewein¹, Enno Giese¹, Albert Roura², Wolfgang P. Schleich^1,2, and the QUANTUS team¹ — ¹Institut für Quantenphysik and Center for Integrated Quantum Science and Technology (IQ^ST), Universität Ulm — ²Institut für Quantentechnologien, Deutsches Zentrum für Luft- und Raumfahrt

The design of future atom-interferometric space missions requires making a decision about the main diffraction mechanism, Bragg [1] or Raman, at an early stage. With this goal in mind, we present a comprehensive study of Raman and Bragg diffraction in a retro-reflective geometry. This setup allows to couple to one (single diffraction) or two counter-propagating light gratings (double diffraction) [2,3] and to observe the transition from one case to the other through a change of the Doppler detuning.

We show that single Raman diffraction reaches high efficiencies for a broad parameter regime, but double Raman diffraction can only be performed efficiently in a Bragg-type regime due to additional off-resonant couplings. Moreover, broad momentum distributions experience appreciable losses in a double-diffraction scheme during a mirror pulse [4].

The QUANTUS project is supported by the German Aerospace Center (DLR) with funds provided by the Federal Ministry of Economics and Energy (BMWi) under grant number 50WM1956 (QUANTUS V).