Abstract
The wavelength range near 3μm has many applications in medical processes due to an overlap with the absorption spectrum of water. Emission of the Er3+ ion near 2.8μm, which operates on the transition from 4I11/2 to 4I13/2 is especially promising as it can be pumped by either 800nm GaAlAs or 980nm InGaAlAs diodes, paving the way for a compact device with low electrical energy consumption.
© 1998 IEEE
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