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arXiv physics/0503240physics.atom-ph
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镱原子1 S 0 - 3 P0光钟跃迁的观测和绝对频率测量

Observation and absolute frequency measurements of the 1S0 - 3P0 optical clock transition in ytterbium

C. W. Hoyt, Z. W. Barber, C. W. Oates, T. M. Fortier, S. A. Diddams, L. Hollberg

摘要:

本文报道了镱的两个奇同位素的(6s^2)1 S_0-(6s 6p)3 P_0高禁带跃迁的直接激发。当扫描激发激光频率时,通过监测磁光阱中~70 uK处原子云的耗尽来检测吸收。在171 Yb(F=1/2)中测得的频率为518,295,836,593.2 +/- 4.4 kHz。在173 Yb(F=5/2)中测得的频率为518,294,576,850.0 +/- 4.4 kHz。测量是由NIST铯喷泉钟校准的飞秒激光频率梳进行的,不确定性降低了近百万倍。这些J=0到J=0跃迁的自然线宽被计算为~10 mHz,使得它们非常适合于支持基于光晶格中的限制的新一代光学原子钟。

英文摘要:

We report the direct excitation of the highly forbidden (6s^2) 1S0 - (6s6p) 3P0 optical transition in two odd isotopes of ytterbium. As the excitation laser frequency is scanned, absorption is detected by monitoring the depletion from an atomic cloud at ~70 uK in a magneto-optical trap. The measured frequency in 171Yb (F=1/2) is 518,295,836,593.2 +/- 4.4 kHz. The measured frequency in 173Yb (F=5/2) is 518,294,576,850.0 +/- 4.4 kHz. Measurements are made with a femtosecond-laser frequency comb calibrated by the NIST cesium fountain clock and represent nearly a million-fold reduction in uncertainty. The natural linewidth of these J=0 to J=0 transitions is calculated to be ~10 mHz, making them well-suited to support a new generation of optical atomic clocks based on confinement in an optical lattice.

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