Open AccessDevelopment of 8-branch Er:fiber frequency comb for Sr and Yb optical lattice clocks
Author(s) -
Yusuke Hisai,
Daisuke Akamatsu,
Takeyuki Kobayashi,
Sho Okubo,
Hajime Inaba,
Kazumoto Hosaka,
Masami Yasuda,
Feng–Lei Hong
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.006404
Subject(s) - frequency comb , optics , ytterbium , laser , beat (acoustics) , comb generator , fiber laser , bandwidth (computing) , atomic clock , physics , wavelength , materials science , telecommunications , computer science
We demonstrate an 8-branch Er:fiber frequency comb with seven application ports, which can be individually optimized for applications with different wavelengths. The beat between the comb and a cw laser has a signal-to-noise ratio exceeding 30 dB at a resolution bandwidth of 300 kHz. The 8-branch frequency comb is used to perform frequency locking for four repumping and lattice lasers, and the frequency measurement of two clock lasers of strontium and ytterbium optical lattice clocks. We have achieved reliable optical lattice clock operation, thanks to the stable frequency locking and measurement obtained by using the 8-branch frequency comb. The developed frequency comb is a powerful experimental tool for various applications, including not only optical lattice clocks, but also research on quantum optics that use many frequency-stabilized lasers.