Bonn 2025 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 26: Poster – Precision Measurement, Metrology, and Quantum Effects
Q 26.34: Poster
Tuesday, March 11, 2025, 14:00–16:00, Tent
Strongly coupled Yb atoms in a high-finesse cavity: lasing and spectral dynamics — •Saran Shaju1, Dmitriy Sholokhov1, Ke Li1, Simon B. Jäger2, and Jürgen Eschner1 — 1Universität des Saarlandes, Experimentalphysik, 66123 Saarbrücken, Germany — 2Physikalisches Institut, University of Bonn, Nussallee 12, 53115 Bonn, Germany
We report on the investigation of optical gain and lasing emission from an ensemble of a few thousand Yb atoms which are magneto-optically trapped using the 1S0 – 1P1 transition at 399 nm, inside a 5 cm-long high-finesse cavity. By optically pumping the atoms on the 1S0 – 3P1 intercombination transition at 556 nm, continuous-wave lasing on the same transition is observed [1]. We have analyzed this two-photon lasing process using heterodyne detection techniques and formulated an empirical modeled based on Bloch equations [2]. Employing magneto-optical trapping solely on the intercombination line results in a colder, denser atomic ensemble, facilitating the collective strong coupling regime in cavity QED. In this setting, we observe additional light scattering from the side-pumped atoms, outside the lasing regime. We investigate experimentally and theoretically these atom number-dependent dynamics that emerge from the strong nonlinear interactions.
[1] H. Gothe et al., Phys. Rev. A 99, 013415 (2019).
[2] D. Sholokhov et al., arXiv:2404.16765 (2024).
Keywords: Cold Yb atoms; Magneto optical trap; Cavity QED; Cold atom lasing; Strong coupling regime