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Latin America Optics and Photonics Conference

Lasing without inversion based on magnetically assisted gain in coherently prepared cold atoms

J. C. de Aquino Carvalho, A. D. M. de Lima, J. W. R. Tabosa

Published Jan 1, 2022• 0 citations
Publisher

Abstract

we report here the work of obtaining with the construction of a ring cavity around a cloud of cold atoms having magnetically assisted gain [Phys. Rev. A 105, 023706 (2022)].
DOI
10.1364/laop.2022.tu1d.7

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This thesis will describe a cold atom ring laser that uses a cloud of magneto-optically trapped potassium atoms as a gain medium and a ring cavity for feedback. Some upgrades to the experiment were necessary, which include a new imaging axis in the vacuum system, a new atom source, alignment of some new optics and detectors to measure the powers and transverse intensity profiles of both counterpropagating cavity modes, and a new tapered amplifier for the magneto-optical trapping beams. The lasing threshold, gain mechanism, intensity correlations, and lasing into the two counterpropagating cavity modes were investigated. The results showed several transverse patterns at the lasing outputs, a threshold as a function of atom number, Mollow gain, a at second-order coherence above threshold, clearly distinguishable from that of fluorescence, nonreciprocity of the TEM\\(_{00}\\) transverse mode as a function of cavity length, and anticorrelated counterpropagating modes.
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.