New data on investigation of novel laser ceramic on the base of cubic scandium sesquioxide: two-band tunable CW generation of Yb³⁺:Sc₂O₃ with laser-diode pumping and the dispersion of refractive index in the visible and near-IR of undoped Sc₂O₃

We report on the first achievement of tunable two-band ``one-micron'' CW oscillation in the 2 F 5/2 → 2 F 7/2 channel of Yb 3+ activator ions in Sc 2 O 3 ceramics with CW laser-diode pumping, as well as on results of precise measurement of the refractive index and its dispersion in spectral range 0.365-2.325 μm and full transmission spectra of undoped Sc 2 O 3 ceramics fabricated by the VSN method.