比消光系数是一个光学名词，用处很广泛。比消光系数是被测溶液对光的吸收大小值；被测溶液浓度高，溶液显色后颜色深，对光吸收大，光透射率低，反之就小。
分子的消光系数等于入射光和透射光强度对数的比。
The molecular extinction coefficient is equal to the ratio of the log of the intensity of the incident and emergent light .
在相同温度不同基底下，熔石英基片薄膜的折射率、损伤阈值高于K 9玻璃基片薄膜，而熔石英基片薄膜的消光系数比K9玻璃基片薄膜的小得多。
In the same temperature and different substrate, the solid silica substrate films 'refractive index and laser induce damage threshold were higher than the K9 substrate films'.
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