and Yb, laser crystals are grown by the Bridgman method. Room-temperature absorption, photoluminescence spectra, and fluorescence lifetimes of ions in the crystals have been investigated. Experimental results show that ions codoping with as charge compensators can suppress the deoxidization of to . The result of diode-pumped laser operation of a Yb, single crystal is reported for the first time to the best of our knowledge . With a -doped sample, we obtained output power at for of incident power at .
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