Measurement of the 4S(1/2) -> 6S(1/2) transition frequency in atomic potassium via direct frequency-comb spectroscopy
We present an experimental determination of the 4S(1/2)-> 6S(1/2) transition frequency in atomic potassium K-39, using direct frequency-comb spectroscopy. The output of a stabilized optical frequency comb was used to excite a thermal atomic vapor. The repetition rate of the frequency comb was scanned and the transitions were excited using stepwise two-photon excitation. The center-of-gravity frequency for the transition was found to be v(cog) = 822 951 698.09(13) MHz and the measured hyperfine A coefficient of the 6S(1/2) state was 21.93(11) MHz. The measurements are in agreement with previous values and represent an improvement by a factor of 700 in the uncertainty of the center-of-gravity measurement.
Stalnaker, J.E., H.M.G. Ayer, J.H. Baron, et al. 2017. "Measurement of the 4S(1/2) -> 6S(1/2) transition frequency in atomic potassium via direct frequency-comb spectroscopy." Physical Review A 96(1): 012504.
American Physical Society
Physical Review A
Physics and Astronomy