Opt Lett. 2018 Sep 15;43(18):4485-4488. doi: 10.1364/OL.43.004485.
We propose a simple scheme for difference frequency generation in free electron lasers (FELs), in which the electron beam interacts with a dual-frequency laser and emits intense coherent radiation at the difference frequency. We analytically show that the microbunch formation in the electron beam, which is the most important process in FELs, is dominated by nonlinear wave mixing in the proposed scheme. Numerical examples of applying the proposed scheme to generating terahertz radiation are presented as one of the most important applications.
我们提出了一种在自由电子激光器（FEL）中产生差频的简单方案，其中电子束与双频激光相互作用，并在差频处发射强相干辐射。我们分析表明，在提出的方案中，电子束中的微束形成（这是 FEL 中最重要的过程）由非线性波混合主导。作为最重要的应用之一，给出了将提出的方案应用于产生太赫兹辐射的数值示例。
