A Yb3 + -doped ring fiber laser based on the principle of nonlinear polarization rotation was constructed. Two kinds of dual-wavelength output ( DWO) including the equal-amplitude and unequal-amplitude DWOs were obtained and their output powers were measured. The results show that the laser conversion efficiencies of different wavelengths were rather different due to gain difference. The DWO tunability was also analyzed, and the influence of pump power on DWO at 1 029 nm and 1 048 nm was investigated. The laser outputs from dual- to seven-wavelengths were observed, and the corresponding pump power ranges and the maximum output power were measured.%通过构建基于非线性偏振旋转机理的掺Yb3+环形光纤激光器,获得了等幅和非等幅两种双波长输出状态,分别测量其输出功率.结果表明,由于不同波段激光增益的差别较大,因此不同波长的转换效率相差较大.分析了双波长输出的可调谐特性,并考察了泵浦功率对1 029 nm和1 048 nm双波长输出的影响.观察到2～7个波长的输出,并测量了其泵浦功率区间及最大输出功率.
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