Liu Han, Gao Yuan, Jiang Yikang, Lu Xiaosong, Yang Zhijie, Wang Pengfei, Yang Zhiyong
Opt Lett. 2024 Oct 15;49(20):5807-5810. doi: 10.1364/OL.539889.
Mid-infrared (MIR) gain materials are of great significance for the development of MIR tunable fiber lasers. Herein, for the first time, to the best of our knowledge, it is found that GaSe nanocrystals distributed in chalcogenide glass ceramics can provide new tetrahedral-coordinated sites that can be used to activate ultrabroadband MIR emissions of divalent transition metal ions, such as Co. Under the excitation of a 1550 nm diode laser, the transparent Ge-Ga-Se glass ceramic embedded with Co: GaSe nanocrystals shows an intense 2.5-5.5 µm ultrabroadband emission. The peak wavelength is located at ∼4.2 µm and the full width at half maximum exceeds 2 µm. Such emission properties, originating from the dual lattice sites of Ga ions, are superior to those of transparent chalcogenide glass ceramics embedded with Co: ZnSe nanocrystals. Moreover, the gas detection system built based on the glass ceramic shows a sensitivity of 45.9 ppm for butane gas. Therefore, the chalcogenide glass ceramics embedded with active Co: GaSe nanocrystals have great potential in MIR tunable fiber lasers and gas sensing.
中红外（MIR）增益材料对于中红外可调谐光纤激光器的发展具有重要意义。在此，据我们所知，首次发现分布在硫属化物玻璃陶瓷中的GaSe纳米晶体能够提供新的四面体配位位点，可用于激活二价过渡金属离子（如Co）的超宽带中红外发射。在1550 nm二极管激光器的激发下，嵌入Co:GaSe纳米晶体的透明Ge-Ga-Se玻璃陶瓷呈现出强烈的2.5 - 5.5 µm超宽带发射。峰值波长位于~4.2 µm，半高宽超过2 µm。这种源于Ga离子双晶格位点的发射特性优于嵌入Co:ZnSe纳米晶体的透明硫属化物玻璃陶瓷。此外，基于该玻璃陶瓷构建的气体检测系统对丁烷气体的灵敏度为45.9 ppm。因此，嵌入活性Co:GaSe纳米晶体的硫属化物玻璃陶瓷在中红外可调谐光纤激光器和气体传感方面具有巨大潜力。
