Liu Jun, Shen Deyuan, Huang Haitao, Zhao Chujun, Zhang Xiaoqi, Fan Dianyuan
Opt Express. 2014 Mar 24;22(6):6605-12. doi: 10.1364/OE.22.006605.
Highly efficient and high-power operation of Raman fiber lasers in fixed-wavelength and wavelength-tunable cavity configurations based on a graded-index multimode fiber is reported. Fixed-wavelength and wavelength tunable operating regimes are achieved using volume Bragg gratings (VBGs) with center wavelengths of 1658 nm and 1750 nm, respectively. The fixed-wavelength laser yielded a maximum output power of 10.5 W at 1658.3 nm with a FWHM linewidth of ~0.1 nm for the launched pump power of 23.4 W, corresponding to a slope efficiency of 82.7% with respect to the launched pump power. The measured beam quality in the form of M² factor is ~1.35, corresponding to the fundamental mode of the fiber. For the wavelength-tunable Raman fiber laser, a wavelength tuning range of 37 nm from 1638.5 to 1675.1 nm is obtained with a maximum output power of 3.6 W at 1658.5 nm for the launched pump power of 13.0 W.
报道了基于渐变折射率多模光纤的固定波长和波长可调谐腔配置的拉曼光纤激光器的高效和高功率运行。分别使用中心波长为1658 nm和1750 nm的体布拉格光栅（VBG）实现了固定波长和波长可调谐工作模式。对于23.4 W的泵浦功率，固定波长激光器在1658.3 nm处产生了10.5 W的最大输出功率，半高宽线宽约为0.1 nm，相对于泵浦功率的斜率效率为82.7%。以M²因子形式测量的光束质量约为1.35，对应于光纤的基模。对于波长可调谐拉曼光纤激光器，在13.0 W的泵浦功率下，在1658.5 nm处获得了3.6 W的最大输出功率，波长调谐范围为37 nm，从1638.5到1675.1 nm。
