Optical integrator system, illumination optical apparatus, exposure apparatus, and device manufacturing method
First Claim
1. An optical integrator system comprising a first optical integrator including a plurality of first wavefront dividing elements juxtaposed, and a second optical integrator including a plurality of second wavefront dividing elements juxtaposed, said first optical integrator and said second optical integrator being arranged in order from an entrance side of light;
- wherein each of the first wavefront dividing elements is so constructed that rays obliquely incident to a center on an optical axis of an entrance surface of the first wavefront dividing element are emitted in parallel with the optical axis from the first wavefront dividing element;
each of the second wavefront dividing elements is so constructed that rays obliquely incident to a center on an optical axis of an entrance surface of the second wavefront dividing element are emitted in parallel with the optical axis from the second wavefront dividing element;
a spacing L12 between an exit surface of the first optical integrator and an entrance surface of the second optical integrator satisfies the condition of P2/(2×
tan θ
)<
L12,where P2 is a pitch along a predetermined direction of the second wavefront dividing elements, and θ
a maximum exit angle (half angle) along the predetermined direction of light from the first wavefront dividing elements; and
no lens or optical element having optical power is arranged in the optical path between the first optical integrator and the second optical integrator.
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Accused Products
Abstract
An optical integrator system comprises a first optical integrator including a plurality of first wavefront dividing elements two-dimensionally juxtaposed, and a second optical integrator including a plurality of second wavefront dividing elements two-dimensionally juxtaposed. Each of the first wavefront dividing elements is so constructed that rays obliquely incident to a center on an optical axis of an entrance surface are emitted in parallel with the optical axis. Each of the second wavefront dividing elements is also so constructed that rays obliquely incident to a center on an optical axis of an entrance surface are emitted in parallel with the optical axis. The system satisfies the condition of P2/(2×tan θ)<L12.
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Citations
20 Claims
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1. An optical integrator system comprising a first optical integrator including a plurality of first wavefront dividing elements juxtaposed, and a second optical integrator including a plurality of second wavefront dividing elements juxtaposed, said first optical integrator and said second optical integrator being arranged in order from an entrance side of light;
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wherein each of the first wavefront dividing elements is so constructed that rays obliquely incident to a center on an optical axis of an entrance surface of the first wavefront dividing element are emitted in parallel with the optical axis from the first wavefront dividing element; each of the second wavefront dividing elements is so constructed that rays obliquely incident to a center on an optical axis of an entrance surface of the second wavefront dividing element are emitted in parallel with the optical axis from the second wavefront dividing element; a spacing L12 between an exit surface of the first optical integrator and an entrance surface of the second optical integrator satisfies the condition of P2/(2×
tan θ
)<
L12,where P2 is a pitch along a predetermined direction of the second wavefront dividing elements, and θ
a maximum exit angle (half angle) along the predetermined direction of light from the first wavefront dividing elements; andno lens or optical element having optical power is arranged in the optical path between the first optical integrator and the second optical integrator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An optical integrator system comprising an optical member including a plurality of optical elements juxtaposed and forming a uniform exit angle, and an optical integrator including a plurality of wavefront dividing elements juxtaposed, said optical member and said optical integrator being arranged in order from an entrance side of light;
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wherein each of the optical elements is so constructed that rays obliquely incident to a center on an optical axis of an entrance surface of the optical element are emitted in parallel with the optical axis from the optical element; each of the wavefront dividing elements is so constructed that rays obliquely incident to a center on an optical axis of an entrance surface of the wavefront dividing element are emitted in parallel with the optical axis from the wavefront dividing element; one optical element of the optical member illuminates a region larger than an entrance surface of one wavefront dividing element of the optical integrator and illuminates a region smaller than an entrance surface of the optical integrator, and no lens or optical element having optical power is arranged in the optical path between said optical member and said optical integrator. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification