研究了室温下铌酸钙钡单晶的光学性质.分别用分光光度计和椭偏光谱仪测量了铌酸钙钡晶体的透射率和折射率随波长的变化关系,结果表明铌酸钙钡晶体具有正常色散关系,且寻常光折射率no大于异常光折射率ne,说明该晶体为负的单轴晶.折射率之差在短波区达到0.12.透射率光谱显示该晶体在400～900 nm波段是透明的.根据透射率计算了该波段晶体的吸收系数以及它的平方根.通过对该曲线的研究,发现铌酸钙钡晶体吸收边以下对应的跃迁为间接跃迁,计算出间接跃迁的禁带宽度Eg为2.94 eV以及声子能量Ep为0.17 eV.此外,通过改变系统光路中偏振片的透振方向,获得了寻常光和异常光的透射率,并进一步计算了它们的吸收系数.
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