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将二维材料硒化钨(WSe_2)与聚合物聚乙烯醇(PVA)混合制成饱和吸收体薄膜,在掺铒保偏光纤激光器中实现了稳定的调Q运转。全保偏的腔体能够最大程度减少环境对激光腔双折射的扰动,在此基础上,研究了硒化钨聚乙烯醇(WSe_2-PVA)饱和吸收体薄膜在调Q运转中的稳定性。研究发现,当材料中的热量累积到一定阈值后,聚合物基底材料首先进入熔融状态,随后热量在薄膜中进一步累积,导致硒化钨受热损坏,表现为饱和吸收体薄膜的损耗急剧增加。
The two - dimensional material WSe_2 and polymer PVA were mixed to form a saturated absorber film, and a stable Q - switched operation was achieved in erbium - doped PM fiber lasers. The fully-preserved partial cavity minimizes the environmental perturbation to the birefringence of the laser cavity. Based on this, the stability of the WSe_2-PVA saturable absorber film in Q-switched operation is studied. The results show that when the heat in the material accumulates to a certain threshold, the polymer matrix material first enters the molten state, and then the heat accumulates further in the film, resulting in the damage of the tungsten selenide, which shows the sharp increase of the loss of the saturated absorber film.