Balaswamy V, Arun S, Chayran G, Supradeepa V R
Opt Express. 2018 Feb 5;26(3):3046-3053. doi: 10.1364/OE.26.003046.
Cascaded Raman fiber lasers have offered a convenient method to obtain scalable, high-power sources at various wavelength regions inaccessible with rare-earth doped fiber lasers. A limitation previously was the reduced efficiency of these lasers. Recently, new architectures have been proposed to enhance efficiency, but this came at the cost of enhanced complexity, requiring an additional low-power, cascaded Raman laser. In this work, we overcome this with a new, all-passive architecture for high-efficiency cascaded Raman conversion. We demonstrate our architecture with a fifth-order cascaded Raman converter from 1117nm to 1480nm with output power of ~64W and efficiency of 60%.
级联拉曼光纤激光器提供了一种便捷的方法，可在稀土掺杂光纤激光器无法覆盖的各个波长区域获得可扩展的高功率光源。此前这些激光器的一个局限是效率较低。最近，人们提出了新的架构来提高效率，但这是以增加复杂性为代价的，需要额外的低功率级联拉曼激光器。在这项工作中，我们通过一种用于高效级联拉曼转换的全新全被动架构克服了这一问题。我们展示了我们的架构，它是一个从1117nm到1480nm的五阶级联拉曼转换器，输出功率约为64W，效率为60%。
