High-concentration Er:YAG single-crystal fibers grown by laser-heated pedestal growth technique

摘要

High-concentration Er:YAG single-crystal fibers have been grown using the laser-heated pedestal growth technique. Instability in the melt and concomitant opacity of fibers were observed at source concentrations higher than 15 mol.%. Spectroscopic examination shows that broadening of the linewidth of the I4→I4 transition is strongly dependent on Er concentration.