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Laser emission in the 1.5-1.6 µm range is important for fiber optic communications. A major candidate as an active ion is Er3+, whose emission from the first excited level falls in this region. Since at high Er concentrations an efficient up-conversion (with rate P1) takes place, depopulating the emitting level (4I13/2), only very diluted Er systems were considered.
© 1994 IEEE
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