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    • 168. 发明公开
    • PROTECTIVE OVERCOAT FOR REPLICATED DIFFRACTION GRATINGS
    • SCHUTZÜBERZUGFÜRWIEDERHOLTES BEUGUNGSGITTER
    • EP1027172A1
    • 2000-08-16
    • EP98939909.2
    • 1998-08-11
    • Cymer, Inc.
    • MORTON, Richard, G.
    • B05D5/06C23C14/24C23C14/46G02B5/18
    • H01S3/225C23C14/0694C23C14/16C23C14/225C23C14/24G02B1/105G02B1/14G02B5/1838G02B5/1847G02B5/1852G02B5/1861G03F7/70025G03F7/70041G03F7/70558G03F7/70575H01S3/03
    • An overcoat protected diffraction grating. A replica grating having a thin aluminum reflective grating surface is produced by replication of a master grating or a submaster grating. The thin aluminum reflective surface may be craked or have relatively thick grain boundaries containing oxides and hydroxides of aluminum and typically is also naturally coated with an aluminum oxide film. The grating is subsequently recoated in a vacuum chamber with a thin, pure, dense aluminum overcoat and then also in the vacuum the aluminun overcoat is coated with a thin film of MgF2. The grating is especially suited for use for wavelength selection in an ArF laser operating producing an ultraviolet laser beam at a wavelength of about 193 nm. The oxygen free aluminum overcoat prevents the ultraviolet light from causing damage by stimulating chemical reactions in grating materials under the aluminum grating surface or in the aluminum overcoat oxide film. The MgF2 additionally prevents oxidation on the surface of the aluminum overcoat.
    • 外涂保护衍射光栅。 具有薄铝反射光栅表面的复制光栅通过主光栅或子光栅的复制产生。 薄的铝反射表面可能是破裂的或具有含有氧化物和铝的氢氧化物的相对较厚的晶界,并且通常也自然地涂覆有氧化铝膜。 随后在具有薄的,纯的,致密的铝外涂层的真空室中重新涂覆光栅,然后在真空中,铝外涂层涂覆有MgF 2的薄膜。 该光栅特别适用于在大约193nm波长下产生紫外激光束的ArF激光器中进行波长选择。 无氧铝外套防止紫外线通过在铝光栅表面或氧化铝膜下的光栅材料中刺激化学反应而引起损伤。 MgF2另外防止铝外套的表面氧化。