학술논문
The optical Ca frequency standard
Document Type
Conference
Author
Source
Proceedings of the 1999 Joint Meeting of the European Frequency and Time Forum and the IEEE International Frequency Control Symposium (Cat. No.99CH36313) Frequency control Frequency and Time Forum, 1999 and the IEEE International Frequency Control Symposium, 1999., Proceedings of the 1999 Joint Meeting of the European. 2:700-705 vol.2 1999
Subject
Language
ISSN
1075-6787
Abstract
PTB operates an optical wavelength/frequency standard by stabilizing the frequency of a laser to the intercombination transition /sup 3/P/sub 1/-/sup 1/S/sub 0/ of laser cooled ballistic atomic /sup 40/Ca at /spl lambda//spl cong/657 nm. The uncertainty of the standard was evaluated by the use of two independent systems. After comparison of the optical frequency with the Cs atomic clock the frequency is determined to be 455 986 240 494.13 (12) kHz.