Carl Zeiss Smt Gmbh

Christian Hettich

Manfred Maul

Nils Dieckmann

Oliver Natt

Karl-Heinz Schuster

Ulrich Wegmann

Michael Layh

Thomas Korb

Matthias Manger

An illumination system of a microlithographic projection exposure apparatus can include at least one transmission filter which has a different transmittance at least at two positions and which is arranged between a pupil plane and a field plane. The transmittance distribution can be determined such that it has field dependent correcting effects on the ellipticity. In some embodiments the telecentricity and/or the irradiance uniformity is not affected by this correction.

Illumination system of a microlithographic projection exposure apparatus

First test beams (-), after passing through an optical system on optical paths that differ in pairs, impinge on a first measurement region () at angles that differ in pairs with respect to the measurement plane. Second test beams (-), after passing through the optical system on optical paths that differ in pairs, impinge on a second measurement region () at angles that differ in pairs, wherein the second region differs from the first. A value of a first measurement variable of the test beam at the first region is detected for each of the first test beams, and comparably for a second measurement variable at the second region for the second test beams. Impingement regions (-) on reference surface(s) () of the optical system are determined and a spatial diagnosis distribution of a property of the reference surface(s) for each test beam is calculated.

Method for measuring an optical system

An illumination system of a microlithographic projection exposure apparatus can include at least one transmission filter which has a different transmittance at least at two positions and which is arranged between a pupil plane and a field plane). The transmittance distribution can be determined such that it has field dependent correcting effects on the ellipticity. In some embodiments the telecentricity and/or the irradiance uniformity is not affected by this correction.

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Aalen, Germany

Christian Hettich