高浓度Er^(3+)掺杂Y_3Sc_2Ga_3O_(12)晶体的吸收光谱与晶体场模型研究

Absorption spectra and crystal-field modeling of Er^(3+) doped in Y_3Sc_2Ga_3O_(12) crystal

采用提拉法生长出了高浓度掺铒(35 at%)钇钪镓石榴石(Er:YSGG)激光晶体.测试了该晶体在340—1700 nm波段内的吸收光谱,对其中Er3+的实验能级进行了分析指认.用Er:YSGG的102个实验Stark能级,拟合了它的自由离子参数和晶体场参数,均方根误差(拟合精度)σ为10.34 cm-1.结果表明,参数化Stark能级的拟合结果与实验光谱符合得较好.将拟合得到的Er:YSGG实验结果与文献中已报道Er:YAG的自由离子参数和晶体场参数进行了比较.指出Er:YSGG具有较强的晶体场相互作用或许是其激光效率较高的主要原因之一.

Er3＋-doped Y3Sc2Ga3O12（Er ： YSGG） single crystal is grown by Czochralski method successfully, and the absorption spectra are measured in a wider spectral wavelength range（340–1700 nm）. The experimental energy levels are analyzed and identified. The free-ion and crystal-field parameters are fitted by the experimental energy levels with a root mean square deviation of 10.34 cm-1, and 102 Stark energy levels of Er3＋in YSGG host crystals are assigned. It indicates that the fitting results of Stark energy levels are more satisfactory with the experimental spectra. Finally, the fitting results of free-ion and crystal-field parameters are compared with those already reported of Er ： YAG crystal. A conclusion is drawn that the Er ： YSGG has higher laser efficiency than Er ： YAG, which may result from Er ： YSGG that has a strong crystal field interaction.