Erlangen 2018 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 33: Poster Session II
A 33.21: Poster
Mittwoch, 7. März 2018, 16:15–18:15, Redoutensaal
UV laser systems for sympathetic cooling of highly charged ions using 9Be+ — •Lukas Spieß1, Lisa Schmöger2, Julian Stark1, Janko Nauta1 und José R. Crespo López-Urrutia1 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 2Institut für Experimentalphysik, Universität Innsbruck, Austria
Precisely measuring the spectrum of cold, highly charged ions (HCIs) is of particular interest for metrology and measuring a possible variation of the fine structure constant. Since HCIs in general lack suitable optical transitions for laser cooling, at CryPTEx [1][2] HCIs are sympathetically cooled by a second laser-cooled ion species. For this purpose 9Be+ is chosen because it can be trapped alongside various HCIs in a linear Paul trap. The photoionization laser for creation of 9Be+ is based on [3]. It consists of a 940 nm diode laser which is twice frequency doubled: firstly using a PPKTP crystal and secondly a BBO crystal. The produced light at 235 nm interacts with the 2s1S0 - 2p1P1 transition for resonance-enhanced two photon ionization. The produced ions are then Doppler-cooled via the 2S1/2 - 2P3/2 transition at 313 nm. The required laser is based on [4] and is generated from fiber lasers at 1051 nm and 1550 nm. In a first stage, 626 nm light is produced by sum frequency generation in a PPLN crystal, followed by second harmonic generation in a BBO crystal to generate the needed 313 nm light.
[1] M. Schwarz et al., Rev. Sci. Instr. 83
[2] L. Schmöger et al., Science 347
[3] H.-Y. Lo et al., Appl. Phys. B 114
[4] A. C. Wilson et al., Appl. Phys. B 105