Project supported by the National Natural Science Foundation of China(Grant No.62275272);the Training Program for Excellent Young Innovators of Changsha,China(Grant No.KQ2206003).
We report a single-frequency linearly polarized Q-switched fiber laser based on an Nb_(2)GeTe_(4)saturable absorber(SA).The Nb_(2)GeTe_(4)SA triggers passive Q-switching of the laser,and an un-pumped Yb-doped fiber to...