Opt Express. 2023 Feb 27;31(5):8441-8452. doi: 10.1364/OE.479227.
The stimulated Raman scattering (SRS) process in gas-filled hollow-core fiber is mostly used to realize the wavelength conversion, which has the potential to produce narrow-linewidth and high-power fiber laser output. However, limited by the coupling technology, the current research is still at a few watts power level. Here, through the fusion splicing between the end-cap and the hollow-core photonics crystal fiber, several hundred watts pump power can be coupled into the hollow core. Homemade narrow-linewidth continuous wave (CW) fiber oscillators with different 3 dB linewidths are used as the pump sources, then the influences of the pump linewidth and the hollow-core fiber length are studied experimentally and theoretically. As the hollow-core fiber length is 5 m the H pressure is 30 bar, 109 W 1 Raman power is obtained with a Raman conversion efficiency 48.5%. This study is significant for the development of high-power gas SRS in hollow-core fibers.
充气体空芯光纤中的受激拉曼散射（SRS）过程主要用于实现波长转换，它有可能产生窄线宽和高功率的光纤激光输出。然而，受限于耦合技术，目前的研究仍然处于几瓦特的功率水平。在这里，通过端帽与空芯光子晶体光纤的熔接，可以将几百瓦特的泵浦功率耦合进空芯。使用不同 3dB 线宽的自制窄线宽连续波（CW）光纤振荡器作为泵浦源，然后从实验和理论两方面研究了泵浦线宽和空芯光纤长度的影响。当空芯光纤长度为 5m、H 压力为 30bar 时，获得了 109W 的 1 阶拉曼功率，拉曼转换效率为 48.5%。这项研究对于空芯光纤中高功率气体 SRS 的发展具有重要意义。
