论文标题
脉冲泵的正常分散kerr迷你谐振器中的频率梳子产生
Frequency comb generation in a pulse-pumped normal dispersion Kerr mini-resonator
论文作者
论文摘要
以正常分散性驱动的Kerr微孔子通常需要存在局部分散扰动，例如避免模式交叉诱导的扰动，以启动光频梳的形成。在这项工作中，我们通过实验表明，可以通过驾驶脉冲泵源来驱动谐振器来提高这一要求。我们还表明，控制泵重复速率与空腔自由谱范围（FSR）之间的对线化提供了一种简单的机制来调整输出梳的中心频率。使用仅6厘米半径的纤维迷你谐振器，我们在实验上以3 thz的带宽为单位平坦的梳子，其中心频率可以通过超过2 THz调节。通过以0.54 GHz FSR的谐波驱动空腔，我们能够生成可在0.54至10.8 GHz之间的线间距的梳子。调整输出梳子的中心频率和频率间距的能力突出了该平台的灵活性。此外，我们证明，在大型泵腔除外的条件下，相同的空腔还支持一种新形式的拉曼辅助异常分散腔孔。
Kerr microresonators driven in the normal dispersion regime typically require the presence of localized dispersion perturbations, such as those induced by avoided mode crossings, to initiate the formation of optical frequency combs. In this work, we experimentally demonstrate that this requirement can be lifted by driving the resonator with a pulsed pump source. We also show that controlling the desynchronization between the pump repetition rate and the cavity free-spectral range (FSR) provides a simple mechanism to tune the center frequency of the output comb. Using a fiber mini-resonator with a radius of only 6 cm we experimentally present spectrally flat combs with a bandwidth of 3 THz whose center frequency can be tuned by more than 2 THz. By driving the cavity at harmonics of its 0.54 GHz FSR, we are able to generate combs with line spacings selectable between 0.54 and 10.8 GHz. The ability to tune both the center frequency and frequency spacing of the output comb highlights the flexibility of this platform. Additionally, we demonstrate that under conditions of large pump-cavity desynchronization, the same cavity also supports a new form of Raman-assisted anomalous dispersion cavity soliton.
