宽带
物理
频率梳
超连续谱
光学
孤子
带宽(计算)
四波混频
色散(光学)
波长
非线性光学
光电子学
光子晶体光纤
电信
激光器
计算机科学
非线性系统
量子力学
作者
Grégory Moille,Edgar F. Perez,Jack A. Stone,Ashutosh Rao,Xiyuan Lu,Tahmid Sami Rahman,Yanne K. Chembo,Kartik Srinivasan
标识
DOI:10.1038/s41467-021-27469-0
摘要
Abstract Broadband and low-noise microresonator frequency combs (microcombs) are critical for deployable optical frequency measurements. Here we expand the bandwidth of a microcomb far beyond its anomalous dispersion region on both sides of its spectrum through spectral translation mediated by mixing of a dissipative Kerr soliton and a secondary pump. We introduce the concept of synthetic dispersion to qualitatively capture the system’s key physical behavior, in which the second pump enables spectral translation through four-wave mixing Bragg scattering. Experimentally, we pump a silicon nitride microring at 1063 nm and 1557 nm to enable soliton spectral translation, resulting in a total bandwidth of 1.6 octaves (137–407 THz). We examine the comb’s low-noise characteristics, through heterodyne beat note measurements across its spectrum, measurements of the comb tooth spacing in its primary and spectrally translated portions, and their relative noise. These ultra-broadband microcombs provide new opportunities for optical frequency synthesis, optical atomic clocks, and reaching previously unattainable wavelengths.
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