Abstract
We report on polarized excited-state absorption (ESA) spectroscopy of thulium-doped fluoride crystals (KY3F10, LiYF4, LiLuF4 and BaY2Y8). The 3F4 → 3F2,3 and 3F4→3H4 ESA channels suitable for upconversion pumping of ~2.3 μm thulium lasers were studied.
© 2020 The Author(s)
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