LNE-SYRTE, Observatoire de Paris, CNRS, UPMC, Paris, France.
Opt Lett. 2012 Sep 1;37(17):3477-9. doi: 10.1364/OL.37.003477.
With 199Hg atoms confined in an optical lattice trap in the Lamb-Dicke regime, we obtain a spectral line at 265.6 nm for which the FWHM is ~15 Hz. Here we lock an ultrastable laser to this ultranarrow 1S0-3P0 clock transition and achieve a fractional frequency instability of 5.4×10(-15)/✓τ for τ ≤ 400 s. The highly stable laser light used for the atom probing is derived from a 1062.6 nm fiber laser locked to an ultrastable optical cavity that exhibits a mean drift rate of -6.0×10(-17) s(-1) (-16.9 mHz s(-1) at 282 THz) over a six month period. A comparison between two such lasers locked to independent optical cavities shows a flicker noise limited fractional frequency instability of 4×10(-16) per cavity.
在兰姆-迪克（Lamb-Dicke）区的光学晶格阱中限制了 199Hg 原子，我们得到了一条 265.6nm 的谱线，其半峰全宽约为 15Hz。在此，我们将超稳定激光锁定在这个超窄的 1S0-3P0 钟跃迁上，并实现了τ≤400s 时 5.4×10(-15)/✓τ 的分数频率不稳定性。用于原子探测的高度稳定激光光源自锁定到超稳定光学腔的 1062.6nm 光纤激光器，该光学腔在六个月的时间内表现出平均漂移率为-6.0×10(-17) s(-1)（在 282THz 处为-16.9mHz s(-1)）。两个锁定到独立光学腔的这种激光器之间的比较表明，每个腔的闪烁噪声限制的分数频率不稳定性为 4×10(-16)。
