高阶模抑制型MILO慢波结构高频特性分析北大核心CSCD

理论分析了高阶模抑制型磁绝缘线振荡器(MILO)慢波结构,推导了其各分区电磁场分布.通过对场分布的进一步分析可以发现,角向开槽使得原始MILO结构中的两个简并的HEM11模式去简并,分裂成为极化方向与开槽方向垂直或平行的两个模式；通过改变慢波结构叶片间开槽角向位置相对关系,可以破坏高阶模式之间π模谐振关系,从而抑制高阶模式的起振,使器件稳定工作在基模.

Supercontinuum source using Q-switched all-fiber nanosecond pulsed laser based on acousto-optical modulation

The laser system based on Q-switched technique of acousto-optical modulation is all-fiber using passive fibers as media to generate supercontinuum, which can output different-width supercontinuum only by adjusting the pump power and repetition rate. With higher pump power, lower repetition rate, longer passive fiber, a wider supercontinuum is obtained. The supercontinuum range can be extended by splicing a passive fiber, and the supercontinuum width exceeds 700 nm when the passive fiber is 200 m long at 1 kHz modulation frequency, 1.0% duty and 4.68 W pump power. The all-fiber nanosecond pulsed laser has simple configuration with fully fiberized cavities without the need for free-space components, allowing for robust and compact system designs. It’s parameters can be easily adjusted by the acousto-optical modulator, which greatly extends the applications in industrial deployment.