Illumination optical apparatus and projection exposure apparatus
First Claim
1. An illumination optical apparatus which illuminates a mask having a pattern with illumination light, the apparatus comprising:
- a plurality of birefringent members arranged in an optical path of the illumination light on an incidence side of a pupil plane of the illumination optical apparatus along an optical axis of the illumination optical apparatus, which change a polarization direction of the illumination light, being incident on a first birefringent member of the plurality of birefringent members in a linearly polarized state, so that the polarization direction of the illumination light on the pupil plane is substantially coincident with a circumferential direction about the optical axis, the first birefringent member being arranged on an incidence side relative to the rest of the plurality of birefringent members,wherein the first birefringent member of the plurality of birefringent members has a fast axis of which direction is different from a direction of a fast axis of a second birefringent member, different from the first birefringent member, of the plurality of birefringent members.
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Accused Products
Abstract
An illumination optical apparatus and projection exposure apparatus capable of reducing a light quantity loss when a mask is illuminated with a polarized illumination light. An illumination optical system for illuminating a reticle with an illumination light and a projection optical system for projecting the pattern image of the reticle onto a wafer are provided. An illumination light emitted from an exposure light source in a linearly polarized state in the illumination optical system passes through first and second birefringent members having different fast axis directions and is converted into a polarized state that is substantially linearly polarized in a circumferential direction with the optical axis as the center in an almost specific annular area, and them illuminates the reticle under an annular illuminating condition after passing through a fly-eye lens.
273 Citations
25 Claims
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1. An illumination optical apparatus which illuminates a mask having a pattern with illumination light, the apparatus comprising:
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a plurality of birefringent members arranged in an optical path of the illumination light on an incidence side of a pupil plane of the illumination optical apparatus along an optical axis of the illumination optical apparatus, which change a polarization direction of the illumination light, being incident on a first birefringent member of the plurality of birefringent members in a linearly polarized state, so that the polarization direction of the illumination light on the pupil plane is substantially coincident with a circumferential direction about the optical axis, the first birefringent member being arranged on an incidence side relative to the rest of the plurality of birefringent members, wherein the first birefringent member of the plurality of birefringent members has a fast axis of which direction is different from a direction of a fast axis of a second birefringent member, different from the first birefringent member, of the plurality of birefringent members. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification