Mainz 2017 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 18: Quantum Effects: Cavity QED I
Q 18.2: Talk
Tuesday, March 7, 2017, 11:15–11:30, P 4
Signatures of Raman-lasing in a side-pumped Ytterbium atom-cavity system — •Hannes Gothe, Anna Breunig, Martin Steinel, and Jürgen Eschner — Universität des Saarlandes, Saarbrücken
A few million Ytterbium atoms are magneto-optically trapped inside a 5 cm long high-finesse cavity using the dipole-allowed 1S0 ↔ 1P1 line at 399 nm (29 MHz linewidth). The atoms are side-pumped with 556 nm-light (i.e. laser-excited under 90∘ to the cavity axis) near the 1S0 ↔ 3P1 intercombination line (182 kHz linewidth), and the scattering into the cavity modes is observed at the output mirrors. Cavity emission is found above a threshold pump intensity and atom number; moreover, the emitted photons show a flat g(2) correlation function. Both observations indicate a lasing process. The conditions and properties of this emission are studied in detail. We will discuss a four-photon Raman process including pump and trap light as the suspected underlying mechanism.