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    • 4. 发明申请
    • CATADIOPTRIC OBJECTIVE FOR SCATTEROMETRY
    • 用于分光光度法的目标目标
    • WO2013098031A1
    • 2013-07-04
    • PCT/EP2012/073929
    • 2012-11-29
    • ASML HOLDING N.V.
    • SMIRNOV, StanislavJOOBEUR, AdelSHMAREV, YevgeniyVENKATARAMAN, Arun
    • G02B17/08
    • G02B17/08G02B17/0856G02B17/0892G03F7/70625G03F7/70633
    • System and method for correcting field curvature in a catadioptric objective that may be used within an inspection apparatus such as a scatterometer. In one embodiment, a catadioptric optical system (800) includes a first catadioptric element (801) and a second catadioptric element (803). The first catadioptric element (801) includes a first surface (809) being reflective and a second surface (807) focusing the beam reflected by the first surface. The second catadioptric element (803) receives the beam reflected by the second surface (807) of the first catadioptric element (801) and includes a third surface (804) being refractive, a fourth surface (806) being reflective and a fifth surface (808) reflecting and focusing the beam reflected by the fourth surface (806) and a sixth surface being refractive (812). The curvature of at least one surface (804, 806, 808, 812) of the second catadioptric element (803) applies a positive contribution to the field curvature associated with the first catadioptric element (801).
    • 用于校正可以在诸如散射仪的检查装置中使用的反射折射物镜中的场曲率的系统和方法。 在一个实施例中,反射折射光学系统(800)包括第一反射折射元件(801)和第二反射折射元件(803)。 第一反射折射元件(801)包括反射的第一表面(809)和聚焦由第一表面反射的光束的第二表面(807)。 第二反射折射元件(803)接收由第一反射折射元件(801)的第二表面(807)反射的光束,并且包括被折射的第三表面(804),反射的第四表面(806)和第五表面 808)反射和聚焦由第四表面(806)反射的光束和第六表面是折射的(812)。 第二反射折射元件(803)的至少一个表面(804,806,808,812)的曲率对与第一反射折射元件(801)相关联的场曲率施加正贡献。