利用啁啾光纤布拉格光栅作为光谱滤波器和色散控制元件来控制掺镱保偏锁模光纤激光的光谱形状和腔内色散.实验装置采用线性腔设计, 利用半导体饱和吸收镜作为锁模器件, 实现掺镱保偏光纤激光器的被动锁模激光输出.当泵浦功率为52 mW时, 获得了脉冲宽度为4.26 ps, 重复频率为15.7 MHz, 平均功率为9.8 mW 的稳定锁模脉冲激光输出.输出激光中心波长为1 030 nm, 3dB谱宽为7.2 nm, 对应理想傅里叶变换极限脉宽约为150 fs.

High stability mode-locked fiber laser whose key is to obtain a stable mode-locked pulse output has broad applications in the optical frequency comb, micro-processing and other fields. In this paper, chirped fiber Bragg grating, as the spectral filter and the dispersion control element, has been used to control the spectral shape and chromatic dispersion of the Yb-doped fiber laser. The mode-locked polarization maintaining fiber laser was obtained by semiconductor saturated absorption mirror. The maximum output power of laser was 9.8 mW by the pump power of 52 mW. The fundamental repetition rate was 15.7 MHz. The center wavelength and the spectral bandwidth were 1 030 nm and 7.2 nm, respectively. The pulse width was measured to be 4.26 ps, corresponding ideal Fourier transform limit pulse width is about 150 fs.