Evaluation of energy migration between Er ions in the fluorescence process of ErYSiO silicate crystals.

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Erbium silicate (Er2SiO5) having 1.6×1022/cm3 Er density is expected as a material for optical sources and optical amplifiers operated at 1.53цm in silicon photonics. Due to short Er-Er distances, however, the energy migration limits the luminescence efficiency. We changed the Er-Er distance by using ErxY2-xSiO5 crystals and evaluated the mechanisms and magnitudes of nonradiative transitions caused by energy migration. We found that nonradiative transitions due to energy migration were almost reduced at x～0.1 (Er～1×1021/cm3). We formed an optical waveguide of 500 цm length and obtained an optical gain of 30dB/cm.