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Applied Physics B

Isotope-selected measurements of the velocity-controlled Yb atomic beam

R. Ohmukai, Hidetsuka Imajo, K. Hayasaka, U. Tanaka, Makoto Watanabe, S. Urabe

Published May 1, 1997• 17 citations
Publisher
DOI
10.1007/s003400050213

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We demonstrate a simple technique to measure the resonant frequency of the 398.9-nm ${}^{1}{S}_{0}\ensuremath{\leftrightarrow}{}^{1}{P}_{1}$ transition for the different Yb isotopes. The technique, which works by observing and aligning fluorescence spots, has enabled us to measure transition frequencies and isotope shifts with an accuracy of 60 MHz. We provide wavelength measurements for the transition that differ from previously published work. Our technique also allows for the determination of Doppler-shifted transition frequencies for photoionization experiments when the atomic beam and the laser beam are not perpendicular and furthermore allows us to determine the average velocity of the atoms along the direction of the atomic beam.
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.