We report on the development of double-cladding active multicore fibre composed of seven single-mode cores of ytterbium doped silica. Laser action in laboratory fibre laser setup is achieved with 61% slope efficiency for optimum fibre length of 14.5 m using incoherent combining of beams generated in each single fibre core. The total mode effective area as a sum of effective areas of generated modes coming out from all cores is 1120 m², opening perspectives for high power scalability. The measured aggregated beam quality of M ² = 17.6 is determined by 95 m distance between single mode active cores. The proposed fibre is a perspective component for development of high power all-fibre laser for lidars.

我们报告了由七个掺镱二氧化硅单模芯组成的双包层有源多芯光纤的开发。实验室光纤激光器设置中的激光作用通过使用每个单纤芯中产生的光束的非相干组合实现，斜率效率为 61%，最佳光纤长度为 14.5 m。总模式有效面积作为来自所有核心的生成模式的有效面积之和为 1120m ²，开启高功率可扩展性的前景。测得的M ² = 17.6 的聚合光束质量由 95m 单模有源核心之间的距离。所提出的光纤是开发用于激光雷达的高功率全光纤激光器的重要组成部分。