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构建了一种能够直接输出高功率贝塞尔超短脉冲的光纤激光放大器.该方案基于在光纤端面特殊设计和制备的微型负轴锥镜,针对常规超短脉冲光纤激光放大系统所设计,不需要引入其他分立整形器件,避免了目前基于轴锥透镜产生贝塞尔光束的通用方法所带来的额外烦琐准直工作,极大简化了产生贝塞尔光束的方法.其中的微型负轴锥镜由聚焦粒子束刻蚀法在一段掺镱大模场光子晶体光纤的端面制备,它和光纤激光系统中的固有准直透镜构成了集成化的光束整形器件.基于数值模拟结果成功搭建的系统与理论设计一致,直接输出了在米量级具有高度准直无衍射特性的啁啾皮秒贝塞尔超短脉冲波包,平均功率高达10.1W,对应脉冲能量178nJ,经过光栅对压缩后脉冲宽度可达140fs.
A fiber laser amplifier capable of direct output of high power Bessel ultrashort pulses was constructed based on a micro negative cone mirror specially designed and prepared on the fiber end face, designed for a conventional ultrashort pulse fiber laser amplification system without The need to introduce additional discrete shaping devices avoids the additional cumbersome collimation efforts that are currently being done with the general approach to generating Bessel beams from axicon lenses and greatly simplifies the generation of Bessel beams, The mirror is fabricated by focused particle beam etching on the end face of a section of ytterbium-doped large-mode photonic crystal fiber, which is integrated with the inherent collimating lens in the fiber laser system. Based on the numerical simulation results, In keeping with the theoretical design, the chirp picosecond ultrashort pulse packet with a high degree of collimation and no diffraction on the order of magnitude is directly output with an average power of up to 10.1 W and a pulse energy of 178 nJ, Width up to 140fs.