Energy Transfer between Er 3 + and Pr 3 + for 2 . 7 μm Fiber Laser Material
نویسندگان
چکیده
Energy transfer mechanisms between Er and Pr in Er/Pr 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 Er:I13/2 to Pr:F3,4, which depopulates the I13/2 level and promotes the 2.7 μm transition effectively. The obvious change in J-O parameters indicates that Pr influences the local environment of Er significantly. The increased spontaneous radiative probability in Er/Pr glass is further evidence for enhanced I11/2 → I13/2 transition. The Er:I11/2→Pr:G4 process is harmful to the population accumulation on I11/2 level, which inhibits the 2.7 μm emission. The microscopic energy transfer coefficient of Er:I13/2→Pr:F3,4 is 42.25 × 10 cm/s, which is 11.5 times larger than that of Er:I11/2→Pr:G4. Both processes prefer to be non-phonon assisted, which is the main reason why Pr is so efficient in Er:2.7 μm emission. OPEN ACCESS
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