Figure 3.3: the linearised scan across the Yb isotopes on the 399nm transition is provided.

Figure 3.3 inset: the linearised scan across the Yb168 399nm transition is provided.

Figure 3.4: the linearised scan across the Yb isotopes (172,174,176) on the 556nm transition is provided.

Figure 3.7: The raw scan for each orthogonal polarisation is provided (on a linearised frequency scale), along with the scaled and differenced spectrum obtain form these.

Figure 3.8: The fluorescence signals for the modulated spectrum and the frequency stabilised laser are provided.

Figure 3.9: The demodulated fluorescence spectroscopy signal is provided on a linearised frequency scale.