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Current Applied Physics

Doppler-dependent fluorescence spectroscopy of Yb atomic gas for trapped-ion experiments

Hyerin Kim, Dahyun Yum, J. Yoo, Eunji Lee, Seoyeon Ko, Hye-In Lee, Taeyoung Choi

Published Jul 16, 2022• 0 citations
Publisher
DOI
10.1016/j.cap.2022.07.006

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Isotope selective optical excitation of atoms is important for experiments with neutral atoms, metrology, and work with trapped ions, including quantum information processing. Polarization-enhanced absorption spectroscopy is used to frequency stabilise a tunable external cavity laser diode system at 398.9 nm for isotope selective photoionization of neutral Yb atoms. This spectroscopy technique is used to measure isotope resolved dispersive features from transitions within a see through configuration Ytterbium hollow-cathode discharge lamp. This Doppler-free dichroic polarization spectroscopy is realised by retro-reflecting a laser beam through the discharge and analysing the polarization dependent absorption with balanced detection. The spectroscopy signal is recovered using lock-in detection of frequency modulation induced by current modulation of the external cavity laser diode. Here, we show the use of polarization-enhanced absorption spectroscopy for isotope selectively loading of 171^{171}171Yb+^++, 172^{172}172Yb+^++, or 174^{174}174Yb+^++ ions into an RF Paul trap.
Polarization effects in gases are investigated by two methods of coherent spectroscopy - stimulated photon echo in molecular gas and laser-induced fluorescence in atomic vapour. A well developed photon echo experimental technique permitted us not only to measure relaxation rates of population, orientation and alignment on degenerated resonant levels in molecular gas but also to study their dependence on particles' longitudinal velocity. The degree of polarization of laser-induced fluorescence in Yb vapour in a mixture with Xe proves a large contribution of depolarizing collisions. The complicated non-exponential fluorescence decay at higher Yb pressures is explained by the radiation trapping.
The authors report preliminary results of precision microwave-optical double resonance spectroscopy on buffer gas cooled /sup 171/Yb/sup +/ ions confined in a linear Paul trap as a microwave frequency standard at 12.6 GHz. They also report laser cooling of trapped /sup 171/Yb/sup +/ ions. Temperatures below 1 K have been achieved, and evidence for a phase transition to a crystal-like state has been found. This temperature is sufficiently low to reduce the fractional second-order Doppler shift of the microwave resonance to below 10/sup -14/.>