论文标题
高功率，电子控制的，用户定义的涡流和矢量光束的来源，基于几个模式光纤放大器
High power, electronically-controlled, source of user-defined vortex and vector light beams based on a few-mode fibre amplifier
论文作者
论文摘要
轨道角动量（OAM）的结构光束为从光学通信到基于激光的材料处理提供了额外的自由度。存在许多技术来在激光源内产生此类梁，这些技术主要依赖于使用特殊设计的光学组件，这些光学组件限制了激光功率缩放和拓扑电荷的现成可调节性以及输出OAM梁的极化。在这里，我们表明，可以通过使用计算机控制的仅相位空间光调制器（SLM）来克服其中一些局限性，以适应几个模式光纤放大器中的输入（和随后的输出）束波前（以及随后的输出）。以这种方式，模偶联诱导的射线变形可以缓解纤维放大器内的光束失真，并且我们能够在纤维中引导的任何所需的支撑的空间模式，包括常规的LP模式，标量OAM模式和圆柱形矢量模式，平均功率> 10 W，并具有10 W的峰值功率，并且具有11 kW的峰值功率。我们的结果为实现具有可调性手性和极化的实用大功率结构激光源的实现铺平了道路。
Orbital angular momentum (OAM) based structured light beams provide an additional degree of freedom for practical applications ranging from optical communication to laser-based material processing. Many techniques exist for generating such beams within laser sources and these primarily rely upon the use of specially designed optical components that limit laser power scaling and ready tunability of the topological charge and polarization of the output OAM beams. Here we show that some of these limitations can be overcome by employing a computer controlled reflective phase-only spatial light modulator (SLM) to adaptively tailor the input (and subsequent output) beam wavefront and polarization in a few-mode fibre amplifier. In this way modal-coupling induced beam distortion within the fibre amplifier can be mitigated and we are able to generate at will any desired supported spatial mode guided in the fibre, including conventional LP modes, scalar OAM modes and cylindrical vector modes, at average powers >10 W and with a peak power of >11 kW. Our results pave the way to the realization of practical high-power structured laser sources with tunable chirality and polarization.
