Abstract
Excited-state absorption of Tm3+ ions (3F4→3F2,3 and 3H4) in the KLu(WO4)2 crystal is studied. Mid-infrared laser operation (3H4→3H5) is achieved with this crystal under upconversion pumping at 1.06 μm yielding 433 mW at 2291 nm. © 2022 The Author(s)
© 2022 The Author(s)
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