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波长为1.55μm附近的激光,对人的眼睛是安全的,在光通讯上有重要应用。晶体中Er3+离子通过4I13/2→4I15/2跃迁可以产生该波长的激光。但Er3+对1.55μm波长激光有较强吸收,而对InGaAs和AlGaAs激光二极管(LD)的激光则吸收很弱,因此用LD抽运Er3+掺杂晶体输出1.55μm激光几乎是不可
Laser light with a wavelength of about 1.55μm is safe for human eyes and has important applications in optical communication. Er3 + ions in the crystal can generate laser of this wavelength through 4I13 / 2 → 4I15 / 2 transition. However, Er3 + has a strong absorption for 1.55μm laser and a weak absorption for InGaAs and AlGaAs laser diodes (LD). Therefore, it is almost impossible to use Er3 + laser to pump 1.55μm laser