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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.
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.
A light source to drive the 1S0-3Po transition in Yb atoms is generated by two solid state lasers: a Nd:YAG laser and a Yb:YAG laser, using a sum-frequency generation (SFG) scheme. SFG power of about 22 mW is obtained at the required frequency.
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