| 摘要 |
<p>There is an illumination optical apparatus capable of forming an intensity distribution profile of light in an exit pupil that is substantially symmetrical with respect to an axis or substantially symmetrical and substantially identical in shape in two perpendicular directions with respect to an axis to illuminate an illumination surface under desired illumination conditions. The illumination optical apparatus includes a first fly's-eye optical system (18a) having first optical components and a second fly's-eye optical system (18b) having second optical components arranged in parallel in one-to-one correspondence to the first optical components. An illumination surface (M) is illuminated with light from each of the second optical components in an overlapping manner. The correspondence relationship between the first optical components and the second optical components is established so that an intensity distribution profile of light in an exit pupil of the illumination optical apparatus is substantially symmetrical with respect to an axis or substantially symmetrical and substantially identical in shape in two perpendicular directions with respect to an axis.</p> |
