Frequency combs based on mode-locked femtosecond lasers allow measurements of optical transition frequencies with a relative accuracy below 1 part in 1015. Such measurements are ultimately limited by the frequency instability and uncertainty of the microwave reference realizing the Si-second, such as a caesium fountain clock. As optical frequency standards (OFS) outperform their microwave counterparts with respect to short- term stability and uncertainty, future measurements are likely to be direct comparisons between different optical frequency standards located in different laboratories, and often different countries.
© 2007 IEEEPDF Article
More Like This
G. Grosche, B. Lipphardt, H. Schnatz, G. Santarelli, P. Lemonde, S. Bize, M. Lours, F. Narbonneau, A. Clairon, O. Lopez, A. Amy-Klein, and Ch. Chardonnet
CMKK1 Conference on Lasers and Electro-Optics (CLEO) 2007
T. Nikas, A. Bogris, and D. Syvridis
CI_5_3 The European Conference on Lasers and Electro-Optics (CLEO_Europe) 2015
CMI1 Conference on Lasers and Electro-Optics (CLEO) 2007