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。

youdao

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。

youdao

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。

youdao

The best-known is probably the Hubble Space Telescope , which operates at optical frequencies.

ECONOMIST: Telescopes are getting bigger, better and less tangible

Some experts in the field seriously question whether it is possible to develop materials capable of perfect lensing at optical frequencies.

BBC: Last Updated: Monday, 8 March 2004, 09:03 GMT

The extent of the problem, at least at optical frequencies, has recently been catalogued by Pierantonio Cinzano and Fabio Falchi at the University of Padua, Italy, and Christopher Elvidge at the National Geophysical Data Centre in Boulder, Colorado.

ECONOMIST: Going, going, nearly gone