Jang Jae K, Okawachi Yoshitomo, Zhao Yun, Ji Xingchen, Joshi Chaitanya, Lipson Michal, Gaeta Alexander L
Opt Lett. 2021 Aug 1;46(15):3657-3660. doi: 10.1364/OL.423654.
We investigate the conversion efficiency (CE) of soliton modelocked Kerr frequency combs. Our analysis reveals three distinct scaling regimes of CE with the cavity free spectral range (FSR), which depends on the relative contributions of the coupling and propagation loss to the total cavity loss. Our measurements, for the case of critical coupling, verify our theoretical prediction over a range of FSRs and pump powers. Our numerical simulations also indicate that mode crossings have an adverse effect on the achievable CE. Our results indicate that microresonator combs operating with spacings in the electronically detectable regime are highly inefficient, which could have implications for integrated Kerr comb devices.
我们研究了孤子锁模克尔频率梳的转换效率（CE）。我们的分析揭示了转换效率与腔自由谱范围（FSR）之间存在三种不同的标度关系，这取决于耦合损耗和传播损耗对总腔损耗的相对贡献。对于临界耦合情况，我们的测量结果在一系列自由谱范围和泵浦功率范围内验证了我们的理论预测。我们的数值模拟还表明，模式交叉对可实现的转换效率有不利影响。我们的结果表明，在电子可检测范围内以特定间距运行的微谐振器梳效率极低，这可能会对集成克尔梳器件产生影响。
