影响扫频激光光源瞬时线宽因素的研究

Study on Factors Influencing Instantaneous Line Width of Frequency-Swept Laser Source

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。

Based on the homemade frequency-swept laser source with a narrow instantaneous line width,the main factors influencing the laser instantaneous line width are investigated by numerical model and experiment.The research results indicate that the instantaneous line width of the frequency-swept laser increases with the increment of dispersion,and the filter bandwidth and the signal pattern loaded to the filter both influence the instantaneous line width.At the same time,the intra-cavity mode competition can ensure a narrower instantaneous laser line width.