Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 41: Poster: Quantum Sensing

FM 41.18: Poster

Dienstag, 24. September 2019, 16:30–18:30, Tents

Control of the spin relaxation in hot atomic ensembles for spatially resolved magnetometry — •Victor Lebedev, Stefan Hartwig, and Thomas Middelmann — PTB 8.21, Abbestr. 2-12, D-10587 Berlin, Germany

Spin relaxation, both longitudinal and transverse, plays an essential role in quantum sensors based on thermal spin-polarized vapor. In case of magnetic field sensor, balance between pumping on one side, and collisional and inhomogeneous broadening, on the other side, defines the sensitivity and spatial resolution of the sensing atomic sub-ensemble. Recent developments in optical pumping techniques open new ways in such ensemble preparation, using diode lasers with high spatial and temporal coherence, spatially resolved and high-bandwidth light-polarization instrumentation and fast intelligent control electronics. We investigate various approaches for the local spin preparation, ranging from conventional pump-probe techniques to structured light pumping and spin polarization imaging. We discuss fundamental and technical limitations of such systems and their possible applications. Our pilot results on inhomogeneous broadening suppression in alkali vapor magnetometer will be presented at the meeting.