A wavefront at high radio frequencies or optical frequencies impinging on the atmosphere is distorted.
高射电频率或光学频率的波阵面进入大气时受到畸变。
NIST scientists also have demonstrated the most precise synthesis ever of optical frequencies, generating specific colors with a reproducibility of 19 digits.
NIST的科学家们还证明了最精确的光频段综合，通过19位数字的重复可以产生各种特定的颜色。
The experiments are a significant step toward next-generation "atomic clocks" based on optical rather than microwave frequencies.
此实验对下一代“原子钟”的产生是重要的一步，下一代“原子钟”将是基于光频而不再是微波频率。
An optical "frequency comb" is a very precise tool for measuring different colors-or frequencies-of light.
光学“频率梳”是一种精确测量光的颜色或频率的工具。
An optical "frequency comb" is a very precise tool for measuring different colors-or frequencies-of light.
光学“频率梳”是一种精确测量光的颜色或频率的工具。
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