Abstract
High quality sesquioxide Er:LuScO3 crystals were grown successfully by the laser floating zone method. Based on the analysis of luminescence spectra and fluorescence lifetimes at the temperatures of 77 K and 300 K. The Er3+-doped sesquioxide shows an effective spectral broadening in the solid solution mixing. Additionally, the local polarization and electron-phonon coupling will be impacted by the increase of Er3+ ions, both of which are favorable for the broadening of spectra. The 10 at% Er:LuScO3 was optimized to operate the 2.7 μm laser, and the largest output power of 326 mW can be acquired with a slope efficiency of 11.3%. To the best of our knowledge, this work was the first to demonstrate a diode-end-pumped Er:LuScO3 crystal laser operation around 3.0 μm.
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