Optical system, exposure system, and exposure method
First Claim
1. An optical system including an optical axis, comprising:
- a first optically transparent member which is made of a uniaxial crystal material and a crystallographic axis of which is arranged substantially in parallel with the optical axis;
a second optically transparent member which is made of a uniaxial crystal material and a crystallographic axis of which is arranged substantially in parallel with the optical axis; and
an optical member located in an optical path between the first optically transparent member and the second optically transparent member and including a predetermined power,wherein a beam bundle of substantially spherical waves in a substantially circular polarization state is incident to the first optically transparent member.
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Accused Products
Abstract
An optical system is able to achieve a substantially azimuthal polarization state in a lens aperture while suppressing loss of light quantity, based on a simple configuration. The optical system of the present invention is provided with a birefringent element for achieving a substantially circumferential distribution or a substantially radial distribution as a fast axis distribution in a lens aperture, and an optical rotator located behind the birefringent element and adapted to rotate a polarization state in the lens aperture. The birefringent element has an optically transparent member which is made of a uniaxial crystal material and a crystallographic axis of which is arranged substantially in parallel with an optical axis of the optical system. A light beam of substantially spherical waves in a substantially circular polarization state is incident to the optically transparent member.
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Citations
31 Claims
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1. An optical system including an optical axis, comprising:
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a first optically transparent member which is made of a uniaxial crystal material and a crystallographic axis of which is arranged substantially in parallel with the optical axis; a second optically transparent member which is made of a uniaxial crystal material and a crystallographic axis of which is arranged substantially in parallel with the optical axis; and an optical member located in an optical path between the first optically transparent member and the second optically transparent member and including a predetermined power, wherein a beam bundle of substantially spherical waves in a substantially circular polarization state is incident to the first optically transparent member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An optical system including an optical axis, comprising:
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a first optically transparent member which is made of a uniaxial crystal material and a crystallographic axis of which is arranged substantially in parallel with the optical axis, the first optically transparent member being arranged at a first position; and a second optically transparent member which is at a position different from the first position in a direction of the optical axis and is made of uniaxial crystal and a crystallographic axis of which is arranged substantially in parallel with the optical axis, wherein a beam bundle of substantially spherical waves in a substantially circular polarization state is incident to the first optically transparent member. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification