Spectroscopy reveals extended gain profiles in ytterbium-doped alkaline earth metal fluorides, suggesting novel laser media.
The optical spectroscopy of an ytterbium-doped multicomponent alkaline earth metal fluoride crystal Yb 3+ ,Y 3+ :(Ca,Sr)F2 was studied with the goal of developing novel gain media for ultrafast mode-locked oscillators. The contribution of phonon-assisted (Stokes) emission to extending the gain profile beyond the range of electronic transitions was evidenced.
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Normani et al. (2025) studied this question.
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