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We demonstrate the spectroscopy of 171Yb atoms confined in a one-dimensional (1D) optical lattice and the absolute frequency measurement of the clock transition. The absolute frequency of the 1S0(F = 1/2) - 3P0(F = 1/2) clock transition in 171Yb is determined to be 518 295 836 590 864(28) Hz with respect to the SI second.
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.
A light source using sum-frequency generation is developed for the ytterbium clock transition at 578 nm. Doppler-free spectroscopy of iodine lines near the Yb clock transition and frequency stabilization are demonstrated with the light source.
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