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Partial energy level diagram of ions indicating the main emissions observed after pumping at . Straight arrows indicate radiative transitions while wavy arrows represent nonradiative transitions.
Room-temperature -polarized emission spectra associated to the transition measured in different experimental conditions: Bulk or low pump power waveguide emission (full circles), waveguide emission at high pumping levels (open circles), and waveguide laser emission (continuous line).
Output efficiency curves measured in and width channel waveguides (open and full circles, respectively).
Calculated modal intensity distributions at pump and signal wavelengths in the and width channel waveguides. The diagram in the lower part of the figure indicates the coordinate reference system.
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