We have measured the frequency of the 5s 2S1/2 -4d 2D5/2 clock transition of a single Sr ion confined in a Paul trap. A diode laser locked to an ultrastable Fabry-Perot (F-P) cavity was used to probe the transition with a resolution of 3.5 kHz. The absolute frequency was determined from heterodyne measurements referenced to an iodine stabilized HeNe laser and a CO2 laser yielding a value for the S-D transition of (444 779 043 963±30) kHz. This work could lead to the development of a new optical frequency standard at 674 nm
Published in:
Instrumentation and Measurement, IEEE Transactions on
(Volume:46
,
Issue:
2
)
Date of Publication: Apr 1997