基于高Q值氮化硅微环反射镜的窄线宽单模光纤激光器

[摘要] 实现了一种基于片上高Q值氮化硅（Si3N4）微环反射镜的单模光纤激光器。利用微环反射镜的窄线宽特性，可以在使用较长增益光纤的同时保证激光的单模激射。由于激光谐振腔的加长，可以得到更好的线宽特性。实验中，采用长度为12 cm的掺铒光纤作为增益介质。通过在掺铒光纤的两端分别使用布拉格光栅（FBG）和微环反射镜，构建了一个基于法布里－珀罗（FP）谐振效应的光纤激光器，微环反射镜的Q值达到2.5×105。获得了线宽为8 kHz的单频激光输出。

[关键词] 光纤激光器；集成光器件；微环；窄线宽

[Abstract] A single frequency erbium-doped fiber laser with an on-chip high-Q silicon nitride (Si3N4) micro-ring reflector is demonstrated in this paper. As a result of the narrow bandwidth of the micro ring cavity, longer gain media can be employed and single-frequency lasing can still be realized, which is also beneficial for better linewidth performance. In our demonstration, the compact laser cavity is composed of an on-chip micro ring with a Q value of up to 2.5 x 105, a 12 centimeters erbium doped fiber and a fiber Bragg grating (FBG). The linewidth of the laser output is about 8 kHz.

[Keywords] fiber laser; integrated optics devices; micro ring; narrow linewidth