Eur. Phys. J. D 57, 247-252 (2010)
https://doi.org/10.1140/epjd/e2010-00052-5

Fiber-laser-based clockwork for long-term measurements and comparisons of visible optical frequency standards

¹ Frequency and Time Group, Institute for National Measurement Standards, National Research Council of Canada, Ottawa, ON, K1A 0R6, Canada
² Department of Physics and Astronomy, University of British Columbia, Vancouver, BC, V6T 1Z1, Canada

Corresponding author: john.bernard@nrc.ca

Received: 26 August 2009
Revised: 9 December 2009
Published online: 2 March 2010

Abstract

A long-term clockwork capable of linking visible optical frequency standards to the radio frequency domain is demonstrated with a continuous measurement stretching eight days. The clockwork is based on a femtosecond fiber laser frequency comb. Using this system, an uncorrected measurement of the ⁸⁸Sr⁺ frequency standard at 445 THz (674 nm) is completed and is in excellent agreement with previous measurements.