Journal
PHYSICAL REVIEW LETTERS
Volume 121, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.121.163603
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Funding
- UK EPSRC [EP/J016985/1]
- DSTL [DSTLX1000092132]
- EPSRC [EP/J016985/1, 1820172] Funding Source: UKRI
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We demonstrate lasing into counterpropagating modes of a ring cavity using a gas of cold atoms as a gain medium. The laser operates under the usual conditions of magneto-optical trapping with no additional fields. We characterize the threshold behavior of the laser and measure the second-order optical coherence. The laser emission exhibits directional bistability, switching randomly between clockwise and counterclockwise modes, and a tunable nonreciprocity is observed as the atoms are displaced along the cavity axis.
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