7 papers
Measurement of the reduced dipole matrix element in Ba
N. Jayjong, M. D. K. Lee, K. J. Arnold +1
We present a high-precision measurement of the reduced electric-dipole matrix element in . By comparing off-resonant scatt…
Absolute frequency measurement of a Lu standard against the NRC-FCs2 fountain with uncertainty
K. J. Arnold, Bin Jian, Zhao Zhang +6
We report an improved absolute frequency measurement of the Lu optical frequency standard, evaluated via a remote link to the NRC-FCs2 caesium fount…
Zero crossings of the differential scalar polarizability of Ba clock transition
N Jayjong, M D K Lee, K J Arnold +1
The differential scalar polarizability of the Ba S-to-D clock transition has a zero crossing near 481nm, which is measured to be 623.603\,13(17)\,THz.…
Lu optical frequency references with accuracy verified at the 19th digit
K. J. Arnold, M. D. K. Lee, Zhao Qi +4
We report a comprehensive evaluation of all known sources of systematic uncertainty for two independent Lu single-ion optical references, finding total systematic uncer…
Precision measurement of the microwave clock transitions
M. D. K. Lee, Qi Zhao, Qin Qichen +4
We report precision measurement of the unperturbed microwave transition frequencies in to a fractional uncertainty of . We find t…
Zeeman Degenerate Sideband Cooling in Lu
Qin Qichen, Qi Zhao, M. D. K. Lee +4
We explore degenerate Raman sideband cooling in which neighboring Zeeman states of a fixed hyperfine level are coupled via a two-photon Raman transition. The degenerate coupling be…
Enhanced micromotion compensation using a phase modulated light field
K. J. Arnold, N. Jayjong, M. L. D. Kang +4
We investigate sideband spectroscopy of a trapped ion using a probe laser phase modulated at the trap drive frequency. The enhanced sensitivity of our technique over traditional si…