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Energy Transfer between Er3+ and Pr3+ for 2.7 μm Fiber Laser Material
Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Science, Shanghai 201800, China
Graduate School of Chinese Academy of Science, Beijing 100039, China
College of Materials Science and Technology, China Jiliang University, Hangzhou 310018, China
These authors contributed equally to this work.
* Author to whom correspondence should be addressed.
Received: 1 November 2013; in revised form: 26 December 2013 / Accepted: 30 December 2013 / Published: 8 January 2014
Abstract: Energy transfer mechanisms between Er3+ and Pr3+ in Er3+/Pr3+ codoped germinate glass are investigated in detail. Under 980 nm LD pumping, 2.7 μm fluorescence intensity enhanced greatly. Meanwhile, 1.5 μm lifetime and fluorescence were suppressed deeply due to the efficient energy transfer from Er3+:4I13/2 to Pr3+:3F3,4, which depopulates the 4I13/2 level and promotes the 2.7 μm transition effectively. The obvious change in J-O parameters indicates that Pr3+ influences the local environment of Er3+ significantly. The increased spontaneous radiative probability in Er3+/Pr3+ glass is further evidence for enhanced 4I11/2 → 4I13/2 transition. The Er3+:4I11/2→Pr3+:1G4 process is harmful to the population accumulation on 4I11/2 level, which inhibits the 2.7 μm emission. The microscopic energy transfer coefficient of Er3+:4I13/2→Pr3+:3F3,4 is 42.25 × 10−40 cm6/s, which is 11.5 times larger than that of Er3+:4I11/2→Pr3+:1G4. Both processes prefer to be non-phonon assisted, which is the main reason why Pr3+ is so efficient in Er3+:2.7 μm emission.
Keywords: 2.7 μm emission; energy transfer micro-parameters; germanate glass
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MDPI and ACS Style
Li, X.; Yang, B.; Zhang, J.; Hu, L.; Zhang, L. Energy Transfer between Er3+ and Pr3+ for 2.7 μm Fiber Laser Material. Fibers 2014, 2, 24-33.
Li X, Yang B, Zhang J, Hu L, Zhang L. Energy Transfer between Er3+ and Pr3+ for 2.7 μm Fiber Laser Material. Fibers. 2014; 2(1):24-33.
Li, Xiangtan; Yang, Binhua; Zhang, Junjie; Hu, Lili; Zhang, Liyan. 2014. "Energy Transfer between Er3+ and Pr3+ for 2.7 μm Fiber Laser Material." Fibers 2, no. 1: 24-33.