高量级光衰减时对线偏振片组衰光系数的研究  

Light attenuation coefficient of polarization attenuator at high attenuation level

作　　者：黄翀[1] 陈海清[1] 廖兆曙[1] 赵爽[1] 

机构地区：[1]华中科技大学光电子科学与工程学院,武汉430074

出　　处：《物理学报》2010年第3期1756-1761,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10476010)资助的课题~~

摘　　要：利用琼斯矢量法推导实际偏振片的琼斯矩阵和两片偏振片组的透射光强表达式和衰光系数表达式.通过计算说明,在高量级光衰减时用马吕斯定律计算偏振片的衰光率存在一定误差.因此,该衰光系数表达式可作为马吕斯定律实际运用时的修正式.依据该理论推导得出两偏振片组的最大衰光率为2ε2,并得到三偏振片组的关于θ2的透射光强表达式.该式以及相应实验表明在θ1,θ2=90°,135°和90°,315°时最大衰光率可达到2ε4.By use of the Jones vector we deduced the Jones matrix of actual polarizer and light transmission expression, as well as the light attenuation coefficient （LAC） of two polarizers. According to computation, certain error exists when using Malus-Law to calculate polarizer’s light attenuation ratio at high attenuation level. So the deduced LAC expression can be considered as a correction to Malus-Law. We get the maximum light attenuation ratio 2ε~2 of two polarizers and light transmission expression about θ_2 of three polarizers. Both the expression and experimental data indicate that the maximum light attenuation ratio can reach 2ε~4 when θ_1,θ_2=90°,135° or 90°, 315°.

关 键 词：偏振片 光衰减 马吕斯定律 琼斯矩阵 

分 类 号：O436.3[机械工程—光学工程]