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Experimental study of the mode instability onset threshold in high-power FA-LPF lasers

机译:高功率FA-LPF激光器模式不稳定阈值的实验研究

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We report here on an experimental investigation of the temporal behavior of transverse mode instabilities into "fully aperiodic large-pitch fibers" (FA-LPFs) operated in high-power continuous-wave laser configuration. To ensure an effective transverse single-mode emission into FA-LPFs, a perfect index matching between the active core and the background cladding materials (Delta n = 0) is required. The original design of such fibers enables an effective transverse single-mode emission by strengthening the higher-order mode delocalization out of the gain region, even for high heat load levels, consequently leading to the improvement of the beam spatial quality. The study was conducted over fibers of various gain region diameters, from 58 to 100 mu m, for a refractive index mismatch Delta n of about + 8 x 10(-5). The emitted beam is characterized using both M-2 measurements and time traces to study the changeover of a stable temporal behavior to an unstable one. (C) 2017 Optical Society of America
机译:我们在这里报告上的实验研究横向模式不稳定的时间行为的成高功率连续波激光器配置操作“完全非周期性大沥青纤维”(FA-的LPF)。以确保有效的横向单模发射到FA-的LPF,(德尔塔N = 0)是必需的活性芯和所述包层的背景材料之间的完美的折射率匹配。这样的纤维的原始设计通过加强高阶模式离域出来的增益区的,甚至对于热负荷高的水平,从而导致光束空间质量的提高使得能够有效横向单模发射。这项研究是在不同增益区直径的纤维进行的,从58至100微米,对于折射率失配达N的约+ 8×10(-5)。所发射的光束是使用M-2的测量和时间跟踪既稳定时间行为的切换研究不稳定的一个表征。 (c)2017年光学学会

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