波长可调谐的超短脉冲激光对通讯、生物医药、度量和激光加工等领域研究有着非常重要的意义。通过非线性偏振旋转技术，利用腔内双折射效应搭建了波长可调谐全正色散超短脉冲掺镱光纤激光器。利用腔内双折射引起的光谱滤波效应，通过适当旋转波片和调整双折射滤波器的角度，耗散孤子可以从1 015~1 075 nm连续调谐。在调谐范围内，其脉冲重复频率25.6 MHz，脉冲宽度4.52 ps，输出功率为85 mW。

Controlled wavelength pulses have widespread applications in the fields of telecommunications, biomedical research, metrology, and laser processing. A wide wavelength tunable all-normal-dispersion femtosecond ytterbium-doped fiber laser is designed based on nonlinear polarization rotation with an intracavity birefringence induced spectral filter. Taking advantage of the intracavity-birefringence induced spectral filtering effect, the center wavelength of the mode-locked femtosecond pulse can be continuously tuned from 1 015 nm to 1 075 nm by properly rotating wave plate and adjusting angle of birefringent filter. Over the tuning range, it delivers pulses of 4.52 ps duration at a repetition rate of 25.6 MHz and an output power of 85 mW.