Ho Seong Lee et al 2003 Metrologia 40 224 doi:10.1088/0026-1394/40/5/303
Ho Seong Lee1, Taeg Yong Kwon1, Hoon-Soo Kang2, Young-Ho Park2, Cha-Hwan Oh2, Sang Eon Park3, Hyuck Cho3 and V G Minogin4
Show affiliationsWe present an evaluation of the frequency shifts in an optically pumped caesium-beam frequency standard caused by the neighbouring transitions. We analyse the shifts caused by the Rabi and Ramsey pulling effects and find a well-known result for the Rabi pulling but a new result for the Ramsey pulling. The revised Ramsey shift is found to be proportional to not the imaginary but the real part of the ground-state atomic coherence. The value of the Ramsey shift is proportional to the first power of the Rabi frequency defined by a small orthogonal component of the microwave field and the inverse value of the Zeeman splitting. We compare the shifts caused by the neighbouring transitions and show that the relative contributions of the Rabi and Ramsey pulling effects crucially depend on the quality of optical pumping. We estimate that the Rabi shift for the KRISS-1 caesium-beam frequency standard is at a relative level of 10−14 while the Ramsey shift is at a relative level of 10−12.
32.80.Xx Level crossing and optical pumping
32.60.+i Zeeman and Stark effects
Issue 5 (October 2003)
Received 16 April 2003
Published 2 September 2003
Ho Seong Lee et al 2003 Metrologia 40 224
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