Fig. 3: Spectroscopic measurements of Cs-vapor cells equipped with make-seal structures.

D1 absorption lines contrast and full width at half maximum (FWHM) for a 6-cell cluster (a) and a 4-cell cluster (b) preceding and following the make-seal actuation. Despite a slight and temporary change of the contrast, the values are not affected by laser sealing. Note that the measurement gaps correspond to MS actuation campaigns of other cell clusters during which the wafer was removed from the spectroscopy bench. c Evolutions of absorption contrast and FWHM during 30 weeks for a dozen of sealed and individually diced cells, including MS-CP shown in Fig. 2c. Note that the time origin (t = 0 days) corresponds to the date of activation of the dispensers. The graph therefore starts at t = 240 days when the cells were diced. Average values of contrast and linewidths are slightly larger in c than in a and b due to better thermalization of the individual cells compared to the wafer