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    • 90. 发明授权
    • Reflective spectral filtering of high power extreme ultra-violet radiation
    • 大功率极紫外辐射的反射光谱滤波
    • US06700700B2
    • 2004-03-02
    • US10408033
    • 2003-04-03
    • Michael Goldstein
    • Michael Goldstein
    • F21V906
    • G03F7/70575G03F7/70158G03F7/70191G03F7/702
    • In one embodiment of the invention, a grating structure etched on a mirror substrate has a grating period causing diffracting, out of an optical path, a first incident radiation within a first band around a first wavelength. A multi-layer coating deposited on the grating structure reflects the first incident radiation, in the optical path, within the first band and a second incident radiation within a second band around a second wavelength. In another embodiment, a first multi-layer coating deposited on a mirror substrate reflects a first incident radiation within a first band around a first wavelength and a second incident radiation, in an optical path, within a second band around a second wavelength. A grating structure is deposited on the first multi-layer coating. The grating structure is etched to have a grating period causing diffracting, out of the optical path, the second incident radiation within the second band.
    • 在本发明的一个实施例中,蚀刻在镜面基板上的光栅结构具有光栅周期,从而在光路内衍射围绕第一波长的第一波段内的第一入射辐射。 沉积在光栅结构上的多层涂层反射在光路内的第一入射辐射在第一波段内,第二入射辐射在第二波段内反射第二波长。 在另一个实施例中,沉积在反射镜基板上的第一多层涂层在围绕第二波长的第二波段内围绕第一波长和第二入射辐射在第一波段内反射第一入射辐射。 光栅结构沉积在第一多层涂层上。 光栅结构被蚀刻以具有光栅周期,从而使光路中的第二入射辐射在第二波段内衍射。