【摘要】 分析了引起磁光石榴石薄膜光衰减的各种因素,导出了光吸收系数α和光散射系数γ的表达式。采用磁光调制比较法测量了（BiTm）₃（FeGa）₅O₁₂薄膜的α、γ值。与通常方法相比,这种方法不仅消除了衬底吸收,薄膜-衬底界面反射对测量α值的影响,而且可以将γ与α分离开来,从而使得到的α值比较接近于真值。更多还原

【Abstract】 This paper analyses various factors leading to optical attenuation in magneto-optic grauet films and derives expressions of optical absorption coefficient a and optical scattering coefficient γ. Values of a and 7 of (BiTm)3(FeGa)5O12 films were measured on the magnetooptic rotation measurement installation by means of the comparison method of the magneto-optic modulation.By comparison with an ordinary method, it can not only eliminate effect of absorption in a substrate and reflection on the interface between a film and a substrate upon measuring the value of a of garnet films, but also separate optical scattering coefficient γ from optical absorption coefficient a, so that the measured value of a comparatively approaches the true value of optical absorption coefficient of magneto-optic garnet film materials.更多还原