Institute of Photonic Technology, Jena 07745, Germany. martin.leich@ipht‑jena.de
Opt Lett. 2013 Mar 1;38(5):676-8. doi: 10.1364/OL.38.000676.
We demonstrate the inscription of a 266 nm UV femtosecond pulse-induced fiber Bragg grating (FBG) in an Yb-doped fiber during optical pumping at 976 nm and the initiation of lasing with increasing grating reflectivity. Output spectra show the emission of the pumped fiber changing from the broad-ranged amplified spontaneous emission in the nonlasing case to the narrow-range laser operation due to the enhancement of FBG reflectivity during inscription. The proposed technique enables the direct characterization and control of FBG performance in fiber lasers. After FBG fabrication, we investigate the spectral characteristics of the fiber laser for different laser powers and study the influence of a thermal treatment of the FBG.
我们演示了在 976nm 光泵浦下，通过 266nm 的紫外飞秒脉冲写入掺镱光纤布拉格光栅（FBG），并随着光栅反射率的增加，实现激光的起始。输出光谱显示，与非激光情况下的宽波段放大自发辐射相比，由于写入过程中 FBG 反射率的增强，泵浦光纤的发射发生了变化，从而实现了窄波段激光运转。该技术可以直接对光纤激光器中的 FBG 性能进行表征和控制。在 FBG 制作完成后，我们研究了不同激光功率下光纤激光器的光谱特性，并研究了 FBG 热处理对其的影响。
