Enhanced 2.7 µm wavelength sub-80 ns pulse generation via iron-chromium co-doped ZnS polycrystalline

作者：Shuaiyi Zhang, Xiaohui Hu, Xiang Zheng Kong, Jianxin Zhao, Guocheng Sun, Hongxia Wang, Enlin Cai, Qingyue Zhang, Shanming Li, Xia Wang, Dunlu Sun, Yin Hang · 发表于：Optics Express · 年份：2025 · DOI：10.1364/oe.550836 · 被引用次数：4 · 研究领域：Laser-Matter Interactions and Applications、Solid State Laser Technologies、Photonic Crystal and Fiber Optics

ions, when used as a saturable absorber (SA), exhibits a longer recovery time and a larger excited state absorption cross-section compared to Fe:ZnS polycrystalline, due to the sensitizing effect of co-doping. The energy level structure and energy transfer process of Fe,Cr:ZnS polycrystalline were analyzed. A 2.7 µm wavelength passively Q-switched (PQS) pulsed laser was simulated and experimentally tested. The experiment achieved a narrower pulse width of 78 ns with a repetition rate of 44 kHz, compared to the Fe:ZnS SA Q-switched laser. The experimental results closely matched the simulation in terms of pulse profile, repetition rate, and pulse width. To the best of our knowledge, this is the first time that Fe,Cr:ZnS polycrystalline is used as a SA to realize PQS lasing. The superior characteristics of co-doped crystals as SAs have also been highlighted.