We compared two methods for measuring large optical frequency differences: an optical frequency comb generator, which creates a large number of sidebands from a single-mode laser through electro-optic modulation, and an optical frequency interval divider chain, which divides a frequency gap successively by two until it becomes accessible to a radio-frequency counter. By locking two diode lasers to two modulation sidebands of a comb generator, similar to 1 THz apart, and measuring this interval with a chain of four phase-locked interval dividers, we demonstrate for the first time to our knowledge the accuracy of both techniques within an experimental limit of 6.8 x 10(-15). (C) 1998 Optical Society of America. [References: 15]
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机译：我们比较了两种测量大光频差的方法：一种光梳式发生器，它通过电光调制从单模激光器产生大量边带;以及一种光分频器链，它连续地划分一个频率间隙。减2，直到射频计数器可以访问为止。通过将两个二极管激光器锁定在梳状发生器的两个调制边带上，相距约1 THz，并用四个锁相间隔分频器链测量该间隔，我们首次证明了这两种技术的准确性实验极限为6.8 x 10（-15）。 （C）1998年美国眼镜学会。 [参考：15]
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