Opt Lett. 2018 Jul 15;43(14):3349-3352. doi: 10.1364/OL.43.003349.
1T-phase titanium diselenide (1T-TiSe), a model two-dimensional (2D) transition metal dichalcogenide, has attracted much attention due to its intriguing electrical and optical properties. In this work, a 1T-TiSe-based high-quality large-area saturable absorber (SA) (1T-TiSe-SA) was successfully fabricated with the liquid-phase exfoliation method. With the as-prepared 1T-TiSe-SA, a stable, passively Q-switched laser operating at 2.95 μm was first realized. Under an absorbed pump power of 3.35 W, the maximum average output power was 130 mW with a slope efficiency of 5%. A pulse width of 160.5 ns was obtained, which is the shortest among 3.0 μm passively Q-switched lasers ever achieved with 2D materials as SAs, to the best of our knowledge. The results indicate that 1T-TiSe is a promising alternative as a nonlinear optical modulator for short-pulse laser generation near the 3.0 μm mid-infrared region.
1T 相二硒化钛（1T-TiSe）作为一种典型的二维（2D）过渡金属二卤化物，由于其独特的电学和光学性质而备受关注。本工作采用液相剥离法成功制备了基于 1T-TiSe 的高质量大面积可饱和吸收体（SA）（1T-TiSe-SA）。利用所制备的 1T-TiSe-SA，首次实现了稳定的、被动调 Q 的 2.95μm 激光运转。在吸收泵浦功率为 3.35W 时，获得了最大平均输出功率为 130mW、斜率效率为 5%的激光输出。所获得的脉宽为 160.5ns，是目前已报道的基于二维材料作为 SA 的 3μm 被动调 Q 激光中最短的，据我们所知。这些结果表明 1T-TiSe 是一种很有前途的近 3μm 中红外短脉冲激光产生用非线性光学调制材料。
