Abstract
Pr amplifier gain efficiencies for different glass hosts and loss coefficients are compared. The gain bandwidth of a sulfide-based amplifier is limited by bottlenecking in the lower level 3H5, but can be improved by adding a second pump resonant with the 3H5-1G4 transition. A hybrid sulfide/fluoride amplifier also improves the bandwidth, and gives a remarkably flat gain spectrum from 1300–1350 nm.
© 2000 Optical Society of America
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