Stable Kerr frequency combs excited in the vicinity of strong modal dispersion disruptions
Stable Kerr frequency combs excited in the vicinity of strong modal dispersion disruptions
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DOI：
10.1117/12.2652926
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发表时间：
2023-03
期刊：
影响因子：
--
通讯作者：
H. Taheri;A. Savchenkov;A. Matsko
中科院分区：
文献类型：
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作者：
H. Taheri;A. Savchenkov;A. Matsko
在过去的十年中，具有克尔型非线性的光学微谐振器已经成为可靠和通用的光学频率梳源，具有各种应用，包括产生低相位噪声射频（RF）信号，小尺寸精密计时和LiDAR。影响克尔微梳在不同波长范围内产生的关键参数之一是腔模色散。色散效应，如避免模式交叉（AMC）已被证明大大限制锁模微梳的产生，特别是当泵在接近这种中断。我们提出的数值模拟和实验证据表明，使用辅助激光泵浦可以抑制近泵浦AMC的不利影响。我们还报告，为我们所知的第一次，打破的可能性的特征孤子步骤成两个稳定的分支对应于不同的稳定的脉冲序列所产生的双色泵浦和AMC的相互作用。这些发现具有重要意义，特别是在较大的谐振器或在较小的波长，如可见光范围内，其中腔变得过模的频率梳的产生。
Optical microresonators possessing Kerr-type nonlinearity have emerged over the past decade as reliable and versatile sources of optical frequency combs, with varied applications including in the generation of low-phasenoise radio frequency (RF) signals, small-footprint precision timekeeping, and LiDAR. One of the key parameters affecting Kerr microcomb generation in different wavelength ranges is cavity modal dispersion. Dispersion effects such as avoided mode crossings (AMCs) have been shown to greatly limit mode-locked microcomb generation, especially when pumping in close proximity to such disruptions. We present numerical modeling and experimental evidence demonstrating that using an auxiliary laser pump can suppress the detrimental impact of near-pump AMCs. We also report, for the first time to our knowledge, the possibility of the breaking of characteristic soliton steps into two stable branches corresponding to different stable pulse trains arising from the interplay of dichromatic pumping and AMCs. These findings bear significance, particularly for the generation of frequency combs in larger resonators or at smaller wavelengths, such as the visible range, where the cavities become overmoded.