Subnatural Linewidth Superradiant Lasing with Cold 88Sr Atoms

Publikation: Bidrag til tidsskriftLetterForskningfagfællebedømt

Superradiant lasers operate in the bad-cavity regime, where the phase coherence is stored in the spin state of an atomic medium rather than in the intracavity electric field. Such lasers use collective effects to sustain lasing and could potentially reach considerably lower linewidths than a conventional laser. Here, we investigate the properties of superradiant lasing in an ensemble of ultracold Sr88 atoms inside an optical cavity. We extend the superradiant emission on the 7.5 kHz wide P31→S10 intercombination line to several milliseconds, and observe steady parameters suitable for emulating the performance of a continuous superradiant laser by fine tuning the repumping rates. We reach a lasing linewidth of 820 Hz for 1.1 ms of lasing, nearly an order of magnitude lower than the natural linewidth.

TidsskriftPhysical Review Letters
Udgave nummer22
Antal sider5
StatusUdgivet - 2 jun. 2023

Bibliografisk note

Funding Information:
We thank Stefan A. Schäffer, Mikkel Tang, and Asbjørn A. Jørgensen for contributions to the experimental apparatus as well as helpful discussions. This project was supported by the European Union’s (EU) Horizon 2020 research and innovation program under the Marie Skłodowska-Curie Grant Agreement No. 860579 (MoSaiQC) and Grant Agreement No. 820404 (iqClock project), the USOQS project (17FUN03) under the EMPIR initiative, and the Q-Clocks project under the European Commission’s QuantERA initiative. We acknowledge funding from VILLUM FONDEN via Research Grant No. 17558.

Publisher Copyright:
© 2023 American Physical Society.


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