Three-level all-fiber laser at 915 nm based on polarization-maintaining Nd3+ doped silica fiber
Nd3+ doped fiber lasers at around 900 nm based on the 4F3/2 → 4I9/2 transition have obtained much research attention since they can be used as the laser sources for generating pure blue fiber lasers through frequency doubling technique. Here, all-fiber laser at 915 nm was realized by polarization-maintaining Nd3+ doped silica fiber. A net gain per unit length of up to 1.0 dB/cm at 915 nm was obtained from a 4.5 cm fiber, which to our best knowledge is the highest gain coefficient reported in this kind of silica fiber. The optical-to-optical conversion efficiency varies with active fiber length and the reflectivity of output fiber Bragg grating (FBG), presenting an optimal value of 5.3% at 5.1 cm fiber length and 70% reflectivity of LR-FBG. Additionally, the linear DBR short cavity was constructed to explore its potential in realizing single frequency 915 nm fiber laser. The measurement result of longitudinal mode properties shows it is still multi-longitudinal modes laser operation with 55 mm laser cavity. These results indicate that the Nd3+ doped silica fiber could be used to realize all-fiber laser at 915 nm, which presents potential to be the seed source of high power fiber laser.
South China University of Technology
Institute of Optical Communication Materials, Materials Science and engineering,
Peng Mingying,wang yafei,li xingyu,wu jiamin,peng xiulin,Cao Jiangkun,Yang Changsheng,Xu Shanhui,Yang Zhongmin. Three-level all-fiber laser at 915 nm based on polarization-maintaining Nd3+ doped silica fiber[J].Chinese Optics Letters,,():.