Light-Shifts of an Integrated Filter-Cell Rubidium Atomic Clock
AEROSPACE CORP EL SEGUNDO CA PHYSICAL SCIENCES LABS
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In this work, we consider the light-shift coefficients observed in rubidium Rb atomic frequency standards, and how the units of measurement reported for light-shift coefficients trace back to the underlying physical parameters of the light-shift. We then measure the light-shift coefficient in an integrated filter-cell, commercial Rb clock, which is similar to the Rb clock design currently flying on Galileo and BeiDou satellites. We measure the light-shift coefficient for two different rf-discharge lamps i.e., a pure 87 Rb lamp and a lamp filled with the natural Rb isotope abundance, and show that under certain conditions it is possible to combine light-shift data. Our light-shift coefficients are consistent with those reported for the Galileo Rb clock under the assumption of a natural or 85 Rb isotopically enriched rf- discharge lamp for the Galileo clock.
- Lasers and Masers
- Metallurgy and Metallography
- Test Facilities, Equipment and Methods