After a lot of late nights by Prof. Doret and Felix Knollmann ’19, we’ve finally finished our 729 nm E2 transition isotope shift measurements. Final data looks something like this prior to analyzing possible systematics:
Details to come in a forthcoming paper. But, in brief: we use a fiber EOM to span the isotope shift in some pairing of co-trapped calcium isotopes and scan the laser across the 729 nm transition in both ions simultaneously. This gives rise to a pair of spectra; we actually alternate scans across two transitions with opposing magnetic field sensitivities (yielding the four spectra shown).
Fitting for the line-centers allows us to extract a value for the isotope shift which is independent from differential Zeeman shifts between the co-trapped ions.
