In this work, a thin-film MoS₂/WS₂/MoS₂/WS₂ heterostructure is employed as a saturable absorber (SA) material for efficient ultrafast pulsed laser operation, achieving a 17.54 GHz Q-switched mode-locked Nd:GGG waveguide laser fabricated by femtosecond laser direct-writing (FsLDW). The mode-locked pulse duration is measured to be as short as 31 ps. The maximum laser slope efficiency and the average output power are determined to be 29.27% and 310 mW, respectively. Such a high-performance compact pulsed laser exhibits promising applications of crystalline waveguide structures and layered heterostructures in ultrafast integrated photonics. This work represents the very first experimental demonstration of a pulsed laser based on FsLDW Nd:GGG waveguides and the very first demonstration of using a MoS₂/WS₂/MoS₂/WS₂ heterostructure as an efficient SA.

中文翻译：

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由异质结构分层材料调制的 17GHz 波导激光器

在这项工作中，薄膜 MoS ₂ /WS ₂ /MoS ₂ /WS ₂异质结构被用作可饱和吸收体 (SA) 材料，用于高效的超快脉冲激光操作，实现了 17.54 GHz Q由飞秒激光直写 (FsLDW) 制造的开关锁模 Nd:GGG 波导激光器。测得的锁模脉冲持续时间短至 31 ps。最大激光斜率效率和平均输出功率分别确定为 29.27% 和 310 mW。这种高性能紧凑型脉冲激光器在超快集成光子学中展示了晶体波导结构和层状异质结构的有前景的应用。这项工作代表了基于 FsLDW Nd:GGG 波导的脉冲激光器的首次实验演示，以及使用 MoS ₂ /WS ₂ /MoS ₂ /WS ₂异质结构作为高效 SA 的首次演示。