Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 54: Posters: Quantum Optics and Photonics IV
Q 54.2: Poster
Thursday, March 12, 2020, 16:30–18:30, Empore Lichthof
Effects of multiple lattices on atomic light-pulse diffraction — •Jens Jenewein1, Sabrina Hartmann1, Enno Giese1, Albert Roura1,2, Wolfgang P. Schleich1,2, and and the QUANTUS Team1,2 — 1Institut für Quantenphysik and Center for Integrated Quantum Science and Technology (IQST ), Universität Ulm, D-89069 Ulm, Germany — 2Institute of Quantum Technologies, German Aerospace Center (DLR), Söflinger Str. 100, D-89077 Ulm, Germany
We study in detail the differences between Raman and Bragg diffraction for different regimes in a retro-reflective geometry [1]. Moreover, we demonstrate the transition between double and single diffraction for an increasing Doppler detuning. Besides the intrinsic limitations of the efficiency of a double-Bragg mirror pulse, imperfections in the orthogonality of the polarizations pose an even more important problem in large-momentum-transfer atom interferometry, as found in related experiments by the QUANTUS project. In order to circumvent these difficulties and to enhance the efficiency, we provide an alternative diffraction technique for mirrors based on standing waves which can be understood as a second-order single-Bragg pulse and demonstrate the robustness against polarization imperfections.
The QUANTUS and BECCAL projects are supported by the German Aerospace Center (DLR) with funds provided by the Federal Ministry for Economic Affairs and Energy (BMWi) under grant numbers 50WM1956 and 50WP1705.
[1] S. Hartmann, J. Jenewein et al., arXiv:1911.12169 [quant-ph]