Abstract Up-conversion luminescence of Er 3+ -doped oxyfluoride germanate optical fiber is observed under laser-diode excitation. The enhanced green emission line is due to 2 H 11/2 , 4 S 3/2 → 4 I 15/2 transition of Er 3+ . The integrated luminescence intensity related to 2 H 11/2 , 4 S 3/2 → 4 I 15/2 (green) and 4 F 9/2 → 4 I 15/2 (red) transitions of Er 3+ is reduced with increasing temperature. Several spectroscopic parameters of Er 3+ ions in optical fibers were determined. The spectral linewidth is reduced, whereas the maximum of emission peak is shifted to longer wavelengths with increasing fiber length.

中文翻译：

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连续波激光二极管激发下掺铒氟氧化锗酸盐光纤的绿色上转换发光

摘要 在激光二极管激发下，观察到了掺Er 3+ 氟氧化物锗酸盐光纤的上转换发光。增强的绿色发射线是由于 Er 3+ 的 2 H 11/2 、4 S 3/2 → 4 I 15/2 跃迁。与 Er 3+ 的 2 H 11/2 、4 S 3/2 → 4 I 15/2（绿色）和 4 F 9/2 → 4 I 15/2（红色）跃迁相关的积分发光强度随着增加而降低温度。确定了光纤中 Er 3+ 离子的几个光谱参数。光谱线宽减小，而发射峰的最大值随着光纤长度的增加而移至更长的波长。