Coherence time of a cold-atom laser below threshold

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Colleges, School and Institutes


We experimentally study the coherence time of a below-threshold Raman laser in which the gain medium is a gas of magneto-optically trapped atoms. The second-order optical coherence exhibits photon bunching with a correlation time that is varied by two orders of magnitude by controlling the gain. Results are in good agreement with a simple analytic model that suggests the effect is dominated by gain, rather than dispersion, in this system. Cavity ring-down measurements show the photon lifetime, related to the first-order coherence time, is also increased.


Original languageEnglish
Pages (from-to)5448-5451
Number of pages4
JournalOptics Letters
Issue number19
Publication statusPublished - 25 Sep 2020