Abstract

We report the first observation to our knowledge of the $6s^2\hspace{0.17em}{{}^{1}S}_0-6s6p\hspace{0.17em}{{}^{1}P}_1^{\circ }$ transition (398.8 nm) of ¹⁶⁸Yb. The relative position of this spectral line was directly determined by using a laser sideband technique to simultaneously probe pairs of lines. The hyperfine structure of ¹⁷¹Yb and the isotope shifts of ¹⁷⁰Yb, ¹⁷¹Yb, and ¹⁷⁴Yb were determined to an accuracy of better than 6 MHz and found to differ by as much as 23 MHz from previous results. By using photon-burst spectroscopy to carry out these measurements we obtained subnatural linewidths and fully resolved the ¹⁷⁰Yb and ¹⁷¹Yb lines, which otherwise overlap in fluorescence.

© 1993 Optical Society of America

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