Opt Lett. 2018 Jun 15;43(12):2933-2936. doi: 10.1364/OL.43.002933.
We report accurate phase stabilization of an interlocking pair of Kerr-microresonator frequency combs. The two combs, one based on silicon nitride and one on silica, feature nearly harmonic repetition frequencies and can be generated with one laser. The silicon-nitride comb supports an ultrafast-laser regime with three-optical-cycle, 1-picosecond-period soliton pulses and a total dispersive-wave-enhanced bandwidth of 170 THz, while providing a stable phase-link between optical and microwave frequencies. We demonstrate nanofabrication control of the silicon-nitride comb's carrier-envelope offset frequency and spectral profile. The phase-locked combs coherently reproduce their clock with a fractional precision of <6×10/τ, a behavior we verified through 2 h of measurement to reach <3×10. Our work establishes Kerr combs as a viable technology for applications like optical-atomic timekeeping and optical synchronization.
我们报告了一对互锁的 Kerr 微谐振器频率梳的精确相位稳定。这两个梳状器，一个基于氮化硅，一个基于二氧化硅，具有近乎谐波重复频率，可以用一个激光来产生。硅氮化物梳状器支持超快激光模式，具有三个光学周期、1 皮秒周期的孤子脉冲和总色散波增强带宽为 170 THz，同时在光和微波频率之间提供稳定的相位链接。我们演示了硅氮化物梳状器载波包络偏移频率和光谱轮廓的纳米制造控制。锁相梳状器以 <6×10/τ 的分数精度相干地再现其时钟，我们通过 2 小时的测量来验证这种行为，达到了 <3×10。我们的工作确立了 Kerr 梳状器作为光学原子计时和光学同步等应用的可行技术。
