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由液相外延方法在YAG晶体衬底上得到了可饱和吸收的Cr ,Ca∶YAG晶体外延层 ,给出了Cr,Ca∶YAG晶体外延层在 5 0 0nm～ 15 0 0nm范围内的室温吸收光谱曲线。分析表明 ,由外延方法获得的Cr,Ca∶YAG晶体吸收光谱的主要特征与提拉法晶体基本相同 ,但发现在 75 0nm左右存在一个弱的吸收峰。这个吸收峰极有可能产生于四面体格位的Cr5+ ,可以归属到电偶极容许的2 B1(2 E)→2 B2 (2 T2 )跃迁。
The epitaxial layer of Cr and Ca:YAG, which can be saturable and absorbed, is obtained by liquid phase epitaxy on YAG crystal substrate. The absorption of Cr and Ca:YAG at room temperature in the range of 500 ~ 1500 nm is obtained Spectral curve. The analysis shows that the main characteristics of the absorption spectra of Cr, Ca: YAG crystal obtained by epitaxial method are basically the same as that of Czochralski crystal, but a weak absorption peak is found around 75 0 nm. This absorption peak is most likely to originate from Cr5 + at the tetrahedral site and can be assigned to the 2 B1 (2 E) → 2 B2 (2 T2) transition that is allowed by the dipole.