Mainz 2017 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 18: Quantum Effects: Cavity QED I

Q 18.2: Vortrag

Dienstag, 7. März 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 1S01P1 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 1S03P1 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.

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