论文标题
使用自由电子激光振荡器的轨道角动量束产生
Orbital angular momentum beam generation using a free-electron laser oscillator
论文作者
论文摘要
具有波长可调性，自由电子激光器（FELS）非常适合在宽的光子能量范围内产生轨道角动量（OAM）梁。我们报告了使用振荡器FEL对OAM梁产生的第一次实验证明。在458 nm左右的激光范围内，我们产生了具有良好的束质量，出色稳定性和实质性腔内功率的连贯混合的OAM梁的四个最低订单。我们还开发了OAM梁的脉冲模式操作，具有高度可再现的时间结构，用于从1到30 Hz的一系列调制频率。这种开发可以扩展到短波长，例如使用未来的X射线弹药振荡器到X射线。这样的OAM FEL的操作还为通过康普顿散射生成OAM伽马射线梁的方式铺平了道路。
With wavelength tunability, free-electron lasers (FELs) are well-suited for generating orbital angular momentum (OAM) beams in a wide photon energy range. We report the first experimental demonstration of OAM beam generation using an oscillator FEL. Lasing around 458 nm, we have produced the four lowest orders of coherently mixed OAM beams with good beam quality, excellent stability, and substantial intracavity power. We have also developed a pulsed mode operation of the OAM beam with a highly reproducible temporal structure for a range of modulation frequencies from 1 to 30 Hz. This development can be extended to short wavelengths, for example to x-rays using a future x-ray FEL oscillator. The operation of such an OAM FEL also paves the way for the generation of OAM gamma-ray beams via Compton scattering.
