| 摘要 |
Four kinds of dielectrics in the form of a mixture of ZrO2 and TiO2 having a refractive index of 2.07, MgF2 having a refractive index of 1.37, Al2O3 having a refractive index of 1.61, and TiO2 having a refractive index of 2.27 are laminated on a transparent glass substrate in twenty layers. Two kinds of unpolarized light beam splitters having ratios of the reflected light to the transmitted light of 7:3 and 8:2, respectively, are thereby obtained. Both kinds of unpolarized light beam splitters have the twentieth layer, that is the outermost layer, formed with MgF2. The difference between the reflectance of the polarizing P component and the reflectance of the polarizing S component of the reflected light is set to be below 10%.
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