Hannover 2013 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 20: Poster: Precision spectroscopy of atoms and ions (with Q)
A 20.14: Poster
Dienstag, 19. März 2013, 16:00–18:30, Empore Lichthof
Laser Systems for the Preparation of Cold Highly Charged Ions — •Sita Eberle1, Oscar O. Versolato1, Matthias Kohnen2, Alexander Windberger1, Maria Schwarz1, Piet O. Schmidt2, Joachim Ullrich1,2, and José R. Crespo Lopez-Urrutia1 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Deutschland — 2Physikalisch-Technische Bundesanstalt, Braunschweig, Deutschland
Highly charged ions (HCIs) are of particular interest for metrology as well as for studying fundamental physics. Narrow optical transitions would provide for new frequency standards with low sensitivity to external fields. Stringent tests of bound-state QED as well as parity violation benefit from strong enhancement effects. For these purposes we have designed a cryogenic Paul trap that enables the trapping and sympathetic laser cooling of HCIs for precision spectroscopy. The coolant of choice is the Be+ ion which requires a Doppler-cooling laser system operating at 313nm wavelength that we constructed in collaboration with PTB. A separate system was developed for the photo-ionization of Be+ ions at 235nm wavelength that can deliver up to several 10mW of UV. It is based on frequency quadrupling an amplified diode laser system operating at 940nm with up to 1500mW output power. Thermal lensing issues limit the first second harmonic generation (SHG) stage, based on resonance enhanced doubling in a bow-tie cavity using an AR-coated PPKTP crystal. The second SHG system also relies on resonance enhanced doubling in a bow-tie cavity employing a Brewster-cut BBO crystal.