A wavefront at high radio frequencies or opticalfrequencies 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。
2
NIST scientists also have demonstrated the most precise synthesis ever of opticalfrequencies, 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。
3
The experiments are a significant step toward next-generation "atomic clocks" based on optical rather than microwave frequencies.