[15p-C32-1~16] CS.2 3.6&3.8 Code-sharing session

△ [15p-C32-12] Single-port, all-polarization-maintaining Er fiber comb for high-stability frequency comparison of optical lattice clocks

〇Noriaki Ohmae^1,2,3, Naoya Kuse⁴, Martin Fermann⁵, Hidetoshi Katori^1,2,3 (1.Univ. of Tokyo, 2.RIKEN, 3.JST-ERATO, 4.IMRA BRL, 5.IMRA America)

Keywords:optical frequency comb, optical lattice clock

An optical lattice clock, which is one of the promising candidates for future redefinition of the second (time and frequency standard), has reached 18-digit accuracy. In order to improve the stability of the frequency ratio measurement of optical lattice clocks with different atomic species, we developed single-port, all-polarization-maintainting Er fiber combs and evaluated their instabilities of frequency ratio measurement. Robustness improved by adopting all-polarization maintaining configuration, and the stability was improved by utilizing single-port configuration to minimize phase-noise contamination.