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Observation of bistability in a perturbed magneto-optical trap

David Wilkowski, Jean Claude Garreau, Daniel Hennequin

\n \nWe report on the experimental observation of bistability in a\nmagneto-optical trap perturbed by a focalized laser beam. This bistability\nis theoretically interpreted by studing the atomic losses induced by the\nperturbing beam. Comparison with a Monte Carlo model allows us to deduce the\ntrap capture velocity along the perturbing beam.\n\n\n

The European Physical Journal DJan 1, 19987 citations

Deterministic instabilities in the magneto-optical trap

A. Stefano, Ph. Verkerk, Daniel Hennequin

arXiv:physics/0306095The European Physical Journal DJul 27, 200420 citations

Active position stabilization of an atomic cloud in a narrow-line magneto-optical trap using a Raspberry Pi

Christian Sillus, Tobias Franzen, Bastian Pollklesener +1 more

We report on a simple method for an active position stabilization of an atomic cloud trapped in a magneto-optical trap operating on the narrow 182 kHz intercombination line of atomic ytterbium. Our method makes use of the significant sensitivity of the position of a narrow-line magneto-optical trap (MOT) on the laser frequency. After in situ detection of the MOT position using a Pi Camera, an error signal is generated by a Raspberry Pi, which is directly fed back onto the laser frequency. Thus, perturbations of the MOT position, e.g., due to drifts of the Zerodur cavity to which the MOT laser is stabilized or the ambient magnetic field, can be compensated directly. Our method allows for long-term stabilization of the MOT position on a 10 µm scale and thus improves loading of a tightly focused optical trap.We report on a simple method for an active position stabilization of an atomic cloud trapped in a magneto-optical trap operating on the narrow 182 kHz intercombination line of atomic ytterbium. Our method makes use of the significant sensitivity of the position of a narrow-line magneto-optical trap (MOT) on the laser frequency. After in situ detection of the MOT position using a Pi Camera, an error signal is generated by a Raspberry Pi, which is directly fed back onto the laser frequency. Thus, perturbations of the MOT position, e.g., due to drifts of the Zerodur cavity to which the MOT laser is stabilized or the ambient magnetic field, can be compensated directly. Our method allows for long-term stabilization of the MOT position on a 10 µm scale and thus improves loading of a tightly focused optical trap.

Review of Scientific InstrumentsMar 1, 20213 citations

Achieving a Stable Magneto-Optical Trap

Chasen S Himeda

Jan 1, 20180 citations

Parameters involved in a magneto-optical trap

Alex Krüger, R. Zanon, Vanderlei Salvador Bagnato +1 more

Livro de ResumosJan 1, 20120 citations

Raman gain and lasing from cold potassium atoms in a ring cavity

Graeme Harvie

This thesis describes an experiment with a cloud of magneto-optically trapped Potassium-39 spatially overlapped with the modes of a high-finesse ring cavity. Optical gain was observed with the system in steady state, without any beams additional to the normal cooling and repump beams in a potassium-39 magneto-optical trap. This was found to operate on a Raman gain mechanism between atomic hyperfine ground states, which has not been seen under similar conditions with other atomic species. Lasing into the cavity modes was then studied, with a particular focus on aspects specific to the ring cavity geometry. This showed a directional bistability and non-reciprocity. The bistability can be described by existing theory, but the mechanism of the non-reciprocity is unknown, despite a detailed investigation. The second order coherence time of the system was explored below threshold, and demonstrates a strong dependence on gain, which may have applications in the detection of extremely small gains.This thesis describes an experiment with a cloud of magneto-optically trapped Potassium-39 spatially overlapped with the modes of a high-finesse ring cavity. Optical gain was observed with the system in steady state, without any beams additional to the normal cooling and repump beams in a potassium-39 magneto-optical trap. This was found to operate on a Raman gain mechanism between atomic hyperfine ground states, which has not been seen under similar conditions with other atomic species. Lasing into the cavity modes was then studied, with a particular focus on aspects specific to the ring cavity geometry. This showed a directional bistability and non-reciprocity. The bistability can be described by existing theory, but the mechanism of the non-reciprocity is unknown, despite a detailed investigation. The second order coherence time of the system was explored below threshold, and demonstrates a strong dependence on gain, which may have applications in the detection of extremely small gains.

Jul 1, 20200 citations

Observation of bistability in a perturbed magneto-optical trap

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