Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 46: Laser Applications: Laser Spectroscopy
Q 46.2: Vortrag
Mittwoch, 25. März 2015, 14:45–15:00, K/HS2
A narrow linewidth spectroscopy laser for Ar13+ — •Tobias Leopold1, Lisa Schmöger2, Stefanie Feuchtenbeiner2, Joachim Ullrich1, José R. Crespo López-Urrutia2, and Piet O. Schmidt1,3 — 1QUEST Institut, Physikalisch-Technische Bundesanstalt, Braunschweig — 2Max-Planck-Institut für Kernphysik, Heidelberg — 3Institut für Quantenoptik, Leibniz Universität Hannover
In the past precision spectroscopy of highly charged ions (HCIs) was limited by Doppler broadening as the ions were mostly created and investigated in an electron beam ion trap (EBIT) with temperatures of several million Kelvin. Recently, we were able to extract HCIs from an EBIT into a Paul trap and sympathetically cool them to the mK range.
We report on the setup and characterization of a spectroscopy laser for the 1s2 2s2 2p 2P3/2− 2P1/2 transition in Ar13+ at 441 nm with 100 kHz linewidth and long-term stability. A Titanium Sapphire laser at 882 nm is frequency stabilized to an external transfer cavity, providing short term stability, and subsequently frequency doubled using a PPKTP crystal in an enhancement cavity. Absolute frequency stability is achieved by stabilizing the length of the transfer cavity to an atomic transition. A polarization spectroscopy setup locks a 780 nm diode laser to a crossover transition of rubidium D-line hyperfine states. Using the offset sideband locking technique we can scan the resonator length and thereby tune the Titanium Sapphire laser by 700 MHz, which is more than the free spectral range of the transfer cavity.