Illumination optical system, exposure apparatus, and exposure method
First Claim
1. An illumination optical system that illuminates an irradiated surface with light supplied from a light source, the illumination optical system comprising:
- a diffractive optical element disposed in an optical path of linearly polarized light supplied from the light source and that forms a multipole illumination field including a plurality of illumination fields;
an optical integrator that forms a multipole light source including a plurality of planar light sources with light that has passed through the multipole illumination field; and
a polarization optical member disposed in an illumination optical path and that sets a polarization direction of light that has passed through the multipole light source to a predetermined polarization direction.
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Abstract
An illumination optical system illuminates an irradiated surface with light supplied from a light source. The illumination optical system includes a diffractive optical element disposed in an optical path of linearly polarized light supplied from the light source. The diffractive optical element forms a multipole illumination field including a plurality of illumination fields. The illumination optical system also includes an optical integrator that forms a multipole light source including a plurality of planar light sources with light that has passed through the multipole illumination field. The illumination optical system also includes a polarization optical member disposed in an illumination optical path and that sets a polarization direction of light that has passed through the multipole light source to a predetermined polarization direction.
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Citations
23 Claims
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1. An illumination optical system that illuminates an irradiated surface with light supplied from a light source, the illumination optical system comprising:
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a diffractive optical element disposed in an optical path of linearly polarized light supplied from the light source and that forms a multipole illumination field including a plurality of illumination fields; an optical integrator that forms a multipole light source including a plurality of planar light sources with light that has passed through the multipole illumination field; and a polarization optical member disposed in an illumination optical path and that sets a polarization direction of light that has passed through the multipole light source to a predetermined polarization direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of illuminating an irradiated surface with light supplied from a light source, the method comprising:
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diffracting linearly polarized light from the light source to form a multipole illumination field including a plurality of illumination fields; forming a multipole light source including a plurality of planar light sources with light that has passed through the multipole illumination field; and setting a polarization direction of light that has passed through the multipole light source to a predetermined polarization direction. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification