The power scaling on mid-infrared Raman fibre lasers (RFLs) is in demand for applications in health, environment and security. In this paper, we present the simulated laser behaviours of the tellurite glass RFLs pumped by 300-W Tm-doped fibre lasers (TDFLs) at $2~\unicode[STIX]{x03BC}\text{m}$ for the first time. By combining the advantages of the TDFLs and tellurite fibre, the output power at $2.35~\unicode[STIX]{x03BC}\text{m}$ has reached over hundreds of watts by first-order Raman shift. Moreover, the cascaded RFLs have been demonstrated with a wavelength extension greater than $3~\unicode[STIX]{x03BC}\text{m}$ and output power of tens of watts. To maximize the output power and the slope efficiency of the RFLs, we further analyse the interaction between the Raman gain and cavity loss, which are determined by fibre length and output reflectance of the laser cavity.

中文翻译：

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用于中红外应用的碲酸盐玻璃拉曼光纤激光器的功率缩放

中红外拉曼光纤激光器 (RFL) 的功率缩放在健康、环境和安全领域的应用中是有需求的。在本文中，我们展示了由 300 W Tm 掺杂光纤激光器 (TDFL) 泵浦的碲酸盐玻璃 RFL 在$2~\unicode[STIX]{x03BC}\text{m}$首次。通过结合 TDFL 和亚碲酸盐光纤的优点，输出功率为$2.35~\unicode[STIX]{x03BC}\text{m}$通过一阶拉曼位移已达到数百瓦。此外，已证明级联 RFL 的波长扩展大于$3~\unicode[STIX]{x03BC}\text{m}$和几十瓦的输出功率。为了最大化 RFL 的输出功率和斜率效率，我们进一步分析了由光纤长度和激光腔的输出反射率决定的拉曼增益和腔损耗之间的相互作用。