They measured the radio frequency instead of optical frequency measurement with optical frequency comb and technology of octave-spanning.
利用光频梳和倍频技术，把对光频的测量变为对射频的测量，这样就能够很容易地测出光的频率。
They measured the radio frequency instead of optical frequency measurement with optical frequency comb and technology of octave-spanning.
利用光频梳和倍频技术，把对光频的测量变为对射频的测量，这样就能够很容易地测出光的频率。
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