Tian Haochen, Yang Wenkai, Kwon Dohyeon, Li Runmin, Zhao Yuwei, Kim Jungwon, Song Youjian, Hu Minglie
Opt Express. 2020 Mar 30;28(7):9232-9243. doi: 10.1364/OE.386231.
A simple and practical apparatus enabling repetition rate (frep) noise, carrier-envelope frequency (fceo) noise and n optical comb mode (νn) noise spectra measurements with high precision is established. The frep and νn noise spectra are measured by a fiber delay line interferometer, while fceo noise spectrum is measured by an f-2f interferometer. We utilize this apparatus to characterize the noise performance of an Er-fiber optical frequency comb (OFC) and analyze the origin of dominant noise sources. Moreover, this apparatus provides a powerful tool for diagnosing noise dynamics intrinsic in mode-locked lasers and OFCs. To this end, we uncover the anti-correlation between frep and fceo noise as well as the impact of servo loops on noise characteristics in the stabilized OFC.
建立了一种简单实用的装置，能够高精度地测量重复频率（frep）噪声、载波包络频率（fceo）噪声和n阶光学频率梳模式（νn）噪声谱。frep和νn噪声谱由光纤延迟线干涉仪测量，而fceo噪声谱由f-2f干涉仪测量。我们利用该装置表征了掺铒光纤光学频率梳（OFC）的噪声性能，并分析了主要噪声源的起源。此外，该装置为诊断锁模激光器和OFC中固有的噪声动态提供了一个强大的工具。为此，我们揭示了frep和fceo噪声之间的反相关性以及伺服环路对稳定OFC中噪声特性的影响。
