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A: Fachverband Atomphysik
A 40: Precision spectroscopy of atoms and ions III (with Q)
A 40.4: Vortrag
Freitag, 4. März 2016, 11:45–12:00, f428
A tunable laser with a drift <100 kHz through stabilization to the Rb D2 line — •Tobias Leopold1, Lisa Schmöger1,2, Stefanie Feuchtenbeiner2, Nils Scharnhorst1, Ian D. Leroux1, José R. Crespo López-Urrutia2, and Piet O. Schmidt1,3 — 1Physikalisch-Technische Bundesanstalt, 38116 Braunschweig — 2Max-Planck-Institut für Kernphysik, 69117 Heidelberg — 3Institut für Quantenoptik, Universität Hannover
Stable lasers with a narrow linewidth are an important tool for precision spectroscopy. Here, we present a simple and versatile laser system for spectroscopy of trapped highly charged ions at sub-Kelvin temperatures. While covering the wavelength range from 780 - 890 nm we reach a linewidth and longterm frequency drift on the 50 kHz level, corresponding to a fractional instability of <1 × 10−10.
As frequency reference we use a low-cost 780 nm DFB-laser stabilized to a hyperfine transition of the rubidium D2 line by modulation transfer spectroscopy. The stability of this laser is transfered to the spectroscopy laser by use of an optical reference cavity. Tunability over 1.5 GHz in closed-loop operation is possible by means of the offset sideband locking technique. We measure the instability of both reference and spectroscopy laser against a Maser-stabilized frequency comb.
The laser system presented here will be used for spectroscopy of the 1s22s22p 2P1/2 − 2P3/2 transition in trapped Ar13+ ions at 441 nm. Sympathetically cooled in a laser cooled cloud of beryllium ions the 100 Hz natural linewidth is expected to be Doppler broadened to several 100 kHz.