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We have been developing a new clock laser system for an Yb optical lattice clock. The system does not include a high finesse cavity at 578 nm, but a fibre-based frequency comb, which is tightly phase-locked to a narrow linewidth Nd:YAG laser at 1064 nm. The Nd:YAG laser is phase locked to a high finesse cavity at 1064 nm made from ultra low expansion glass.
We have magneto-optically trapped cold ytterbium atoms using an intercombination transition for realizing an optical lattice clock. For this purpose, we have developed a laser-diode-based light source, which is phase-locked to an optical frequency comb, thus attaining both laser frequency stabilization and laser linewidth narrowing.
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