摘要
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 saturable absorber Cr,Ca∶YAG based on the undoped YAG was successfully grown by liquid phase epitaxy. The results from the absorption spectra analysis of the Cr,Ca∶YAG show that the main features in visible and near infrared range are the same as these by the Czochralski. Nevertheless, there is a weak absorption band centered around λ≈750 nm, which is first observed in the YAG lattice field. This weak band is interpreted as the arising from tetrahedrally coordinated Cr 5+ , and proposed to assign to the electric dipole allowed 2B 2( 2E)→ 2B 1( 2T 2) transition.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2002年第3期374-378,共5页
Acta Optica Sinica
基金
国防科技预研基金 (99J2 .1.3DZ0 2 0 2 )资助课题
