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We demonstrate a precision frequency measurement using a phase-stabilized 120-km optical fiber link over a physical distance of 50 km. The absolute frequency of the 87Sr optical lattice clock is measured to be 429228004229874.1(2.4) Hz.
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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