Opt Lett. 2019 Nov 1;44(21):5230-5233. doi: 10.1364/OL.44.005230.
The high-power, short-wavelength operation of a thulium-doped silica fiber laser at 1726 nm has been demonstrated in a core-pumped monolithic (all-fiber) resonator configuration, in-band pumped by a high-power erbium-only fiber laser operating at 1580 nm. The thulium fiber laser yielded 47 W in a single-spatial-mode output beam for 60-W absorbed pump power. The corresponding slope efficiency, with respect to an absorbed pump power of 80%, compares favorably with the theoretical maximum (Stokes) efficiency of 91.5%. The prospects for further scaling of single-mode power in this wavelength regime to >100 W are considered, as well as the potential applications for high-power lasers operating in this difficult-to-reach wavelength band.
已在芯泵浦的整体式（全光纤）谐振腔结构中演示了掺铥石英光纤激光器在 1726nm 的高功率、短波长运行，该谐振腔采用高功率掺铒光纤激光器在 1580nm 波段内泵浦。对于 60W 的吸收泵浦功率，掺铥光纤激光器在单空间模式输出光束中产生了 47W 的功率。相对于 80%吸收泵浦功率，相应的斜率效率与理论最大值（斯托克斯）效率 91.5%相当。考虑到在 >100W 的单模功率方面进一步扩展该波长范围的可能性，以及在难以达到的该波长波段中运行的高功率激光器的潜在应用。
