2.2 ELECTRICAL, ELECTRONIC, INFORMATION ENGINEERING
Intense 3.5 μm mid-infrared emission has been achieved in Er3+-doped ZBYA glasses, which is ascribed to the Er3+: 4F9/2→4I9/2 transition. Based on the absorption spectrum of Er3+ ions, a 638 nm laser was utilized to directly pump the upper level (Er3+: 4F9/2) to achieve 3.5 μm emission with enhanced quantum efficiency. Spectroscopic parameters were predicted by Judd-Ofelt theory. The maximum emission cross-section of the Er3+-doped ZBYA glass was estimated to be 5.5×10-22 cm2 at 3496 nm. Additionally, the fluorescence spectra and energy level lifetimes of ZBYA glass samples with different Er3+ ions doping concentrations were also measured. The theoretical and experimental results confirm the potential of Er3+-doped ZBYA glasses for use in the development of 3.5 μm mid-infrared fiber lasers.
Zhao, Haiyan; Tian, Ke; Wang, Xin; Liu, Dejun; Wang, Shunbin; Farrell, Gerald; and Wang, Pengfei, "An investigation of 3.5 μm emission in Er3+-doped fluorozirconate glasses under 638 nm laser excitation" (2023). Articles. 46.
National Key Scientific Instrument and Equipment Development Projects of China (61727816); Shenzhen Fundamental Research Program (JCYJ20190808140805488, JCYJ20190808173401660, JCYJ20190808173619062); Basic and Applied Basic Research Foundation of Guangdong Province (2019A1515110320); National Natural Science Foundation of China (11874332, 62105217).
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