Frequency combs have high time–frequency accuracy, which makes them useful for applications in precision spectroscopy, ultra-sensitive detection and atomic clocks. Traditional methods of creating frequency combs hinge on material nonlinearities, which are often weak. These methods require high power densities to surpass their initiation thresholds, subsequently limiting their potential use. Here we demonstrate a nonlinear coupling process that efficiently generates magnonic frequency combs by exploiting exceptional points in a coupled system of two different magnon modes. Our approach is a simple and optimal path to produce magnonic frequency combs at low pump power with excellent tunability of exceptional points.

频率梳具有较高的时频精度，这使其可用于精密光谱、超灵敏检测和原子钟等领域。创建频率梳的传统方法取决于材料的非线性，而材料的非线性通常很弱。这些方法需要高功率密度才能超过其引发阈值，从而限制了它们的潜在用途。在这里，我们演示了一种非线性耦合过程，该过程通过利用两种不同磁振子模式的耦合系统中的异常点来有效地生成磁振子频率梳。我们的方法是一种简单且最佳的路径，可以在低泵浦功率下产生磁频率梳，并具有出色的特殊点可调谐性。