在搭建的窄瞬时线宽的扫频激光光源的基础上,通过实验和数值模型对影响激光瞬时线宽的主要因素进行了研究。研究结果发现,扫频激光的瞬时线宽会随着色散的增加而变宽,滤波器的带宽和加载给滤波器的信号都会影响瞬时线宽,同时腔内的模式竞争能够保证更窄的激光瞬时线宽。 On the basis of the swept frequency laser source with narrow instantaneous line width, the main factors affecting the instantaneous line width of the laser are studied through experiments and numerical models. The results show that the instantaneous linewidth of the swept laser will broaden with the increase of the dispersion. The bandwidth of the filter and the signal applied to the filter will affect the instantaneous linewidth, and the mode competition in the cavity can ensure a narrower laser Instantaneous line width.