利用飞秒光梳和频产生技术测量SF6双光子线的绝对频率
Absolute frequency measurement of an SF6 two-photon line using a femtosecond optical comb and sum-frequency generation
摘要：
我们展示了一种新的简单的技术来测量近30太赫兹的红外频率使用飞秒（fs）激光光梳和和频产生。光频率直接与fs激光器的两个模式之间的距离进行比较，并且所得到的拍音用于控制仅取决于fs激光器的重复率fr的该距离。首次测量了稳定在SF_6双光子线上的CO_2激光器的绝对频率。这条线是一个有吸引力的替代通常的饱和吸收OsO 4共振用于稳定的CO2激光器。第一个结果表明在1 s时的分数Allan偏差为3.10-14。
英文摘要：
We demonstrate a new simple technique to measure IR frequencies near 30 THz using a femtosecond (fs) laser optical comb and sum-frequency generation. The optical frequency is directly compared to the distance between two modes of the fs laser, and the resulting beat note is used to control this distance which depends only on the repetition rate fr of the fs laser. The absolute frequency of a CO2 laser stabilized onto an SF6 two-photon line has been measured for the first time. This line is an attractive alternative to the usual saturated absorption OsO4 resonances used for the stabilization of CO2 lasers. First results demonstrate a fractional Allan deviation of 3.10-14 at 1 s.
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