Figure 2
From: Carrier thermometry of cold ytterbium atoms in an optical lattice clock
The carrier spectrum. (a) The central carrier transitions for different lattice frequencies. Far away from the magic frequency, the line is broadened and shifted due to the ac Stark effect. (b) The carrier spectra for different lattice frequencies, where the line shape is symmetric and narrow at the magic frequency accompanied by the asymmetric and broadened line shapes at non-magic frequencies.
