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Q: Fachverband Quantenoptik und Photonik
Q 48: Quantum Effects II
Q 48.6: Talk
Thursday, March 17, 2022, 11:45–12:00, Q-H13
Characterisation of lasing from cold trapped Yb atoms — •Saran Shaju, Dmitriy Sholokhov, and Jürgen Eschner — —Universität des Saarlandes, Germany
We observe optical gain and laser emission from a medium of a few thousand Ytterbium-174 atoms which are magneto-optically trapped (MOT), using their 1S0→ 1P1 transition at 399 nm, inside a 5-cm long high-finesse cavity. The cavity output is observed as continous wave lasing on the 1S0→ 3P1 intercombination line at 556 nm when the atoms are laser-pumped on the same transition. The physics behind the observation is understood as a multi-photon lasing mechanism involving the MOT transition [1]. By heterodyne analysis, we analyse the frequency characteristics of the system versus pump and cavity detuning. By cooling the atoms near the Doppler limit of the intercombination transition, we observe an increase in atomic density and a corresponding reduction of the laser threshold.
[1] H. Gothe, D. Sholokhov, A. Breunig, M. Steinel, and J. Eschner. Phys. Rev. A, 99, 013415, 2019.