| 摘要 |
PURPOSE:To obtain a superior spectral reflection characteristic over a wide wavelength range, to have superior durability, and to maintain stable performance by laminating layers made of specific materials in specific order. CONSTITUTION:The optical film thicknesses of the 1st, 2nd, and 3rd layers which are laminated in order on the surface of an optical component are denoted as n1d1 - n3d3 within ranges shown by expressions I - III. Here, lambda is the wavelength of applied light, n1, n2, and n3 are the refractive indexes of the 1st, 2nd, and 3rd layers to the light with the wavelength lambda, and d1, d2, and d3 are the thicknesses of the 1st, 2nd, and 3rd layers. Consequently, reflection prevention effect is superior over a wide wavelength range and the sufficient durability is obtained. |
