利用光学周期平均法能够清晰地描绘带有噪声的周期性图象。
Noisy images with a periodic structure can be cleared by utilizing optical periodic average method.
研究发现，当采用12个光学周期的特定组合脉冲时，孤立阿秒脉冲可以实现。
It is shown that by adopting particular combined pulse with 12 optical cycles, single attosecond pulse can be obtained.
在天文学中，在光学天文学中，我们不能测量周期或者可见光的频率。
In astronomy, in optical astronomy, we cannot measure the period or the frequency of optical light.
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