Recent results on the 688 THz Yb+ single-ion optical frequency standard are presented. The relative uncertainty of absolute frequency measurements of the standard was reduced to 2.0×10−15. We prepare to observe the electric-octupole transition of Yb+ at 642 THz with sub-hertz resolution. Measurements of the frequency ratio between the 688 THz and 642 THz transitions in Yb+ will permit to search for temporal variations of the fine structure constant.

© 2007 Optical Society of America

PDF Article


You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
Login to access OSA Member Subscription