Shere William, Fokoua Eric Numkam, Jasion Gregory T, Poletti Francesco
Opt Express. 2022 Oct 24;30(22):40425-40440. doi: 10.1364/OE.473681.
We investigate the design of hollow-core fibers for the delivery of 10s of kilowatt average power from multi-mode laser sources. For such lasers, delivery through solid-core fibers is typically limited by nonlinear optical effects to 10s of meters of distance. Techniques are presented here for the design of multi-mode anti-resonant fibers that can efficiently couple and transmit light from these lasers. By numerical simulation we analyze the performance of two anti-resonant fibers targeting continuous-wave lasers with M up to 13 and find they are capable of delivering MW-level power over several kilometers with low leakage loss, and at bend radii as small as 35 cm. Pulsed lasers are also investigated and numerical simulations indicate that optimized fibers could in principle deliver nanosecond pulses with greater than 100 mJ pulse energy over distances up to 1 km. This would be orders of magnitude higher power and longer distances than in typical machining applications using the best available solid core fibers.
我们研究了用于从多模激光源传输数十千瓦平均功率的空心光纤的设计。对于此类激光器，通过实心光纤传输通常会受到非线性光学效应的限制，传输距离仅为数十米。本文介绍了用于设计多模抗谐振光纤的技术，这种光纤能够有效地耦合和传输来自这些激光器的光。通过数值模拟，我们分析了两种针对M值高达13的连续波激光器的抗谐振光纤的性能，发现它们能够在数公里的距离上以低泄漏损耗传输兆瓦级功率，并且在弯曲半径小至35厘米的情况下也能如此。我们还研究了脉冲激光器，数值模拟表明，优化后的光纤原则上可以在长达1公里的距离上传输脉冲能量大于100 mJ的纳秒脉冲。这将比使用现有最佳实心光纤的典型加工应用中的功率高出几个数量级，传输距离也更长。
