Method for measuring and suppressing repetition rate phase noise of femtosecond laser using optical fiber delay line광섬유 지연 라인을 이용한 펨토초 레이저의 반복률 위상 잡음 측정 및 억제 방법
Provided is a method of measuring a phase noise of a repetition rate of a femtosecond laser including generating a combined signal using a first wavelength element and a second wavelength element of an optical pulse train generated by the femtosecond laser, which is mode-locked, guiding the combined signal to a first path and a second path, allowing a signal of the second path to interfere with the signal of the first path, and outputting an interfering combined signal, dividing the interfering combined signal into a first interference signal and a second interference signal, converting the interference signals to radio frequency signals, and detecting a baseband signal including a frequency noise of the repetition rate from the radio frequency signals using a mixer.