论文标题
Chi（2）微孔子中的Eckhaus不稳定性和参数转换的梯子
Ladder of Eckhaus instabilities and parametric conversion in chi(2) microresonators
论文作者
论文摘要
在过去的十年中，低损失微孔子已经彻底改变了非线性和量子光学元件。特别是，具有二阶Chi（2）的微孔子，非线性具有广泛的光谱可调性和低功率频率转换的优势。最近的观察表明，CHI（2）微孔子中的参数频率转换伴随着信号和惰轮频率的逐步变化。因此，对基于这种行为的理论的机制和发展的更好理解是及时的。在这里，我们报告逐步频率转换起源于所谓的Eckhaus不稳定性的离散序列。在1960年代发现流体动力学中的这些不稳定性之后，它们已成为广泛传播的跨学科概念。现在，我们证明了Eckhaus机制还支持CHI（2）微孔子中频率调整曲线的梯子样结构。
Low loss microresonators have revolutionised nonlinear and quantum optics over the past decade. In particular, microresonators with the second order, chi(2), nonlinearity have the advantages of broad spectral tunability and low power frequency conversion. Recent observations have highlighted that the parametric frequency conversion in chi(2) microresonators is accompanied by stepwise changes in the signal and idler frequencies. Therefore, a better understanding of the mechanisms and development of the theory underpinning this behaviour is timely. Here, we report that the stepwise frequency conversion originates from the discrete sequence of the so-called Eckhaus instabilities. After discovering these instabilities in fluid dynamics in the 1960s, they have become a broadly spread interdisciplinary concept. Now, we demonstrate that the Eckhaus mechanism also underpins the ladder-like structure of the frequency tuning curves in chi(2) microresonators.
