| 摘要 |
There is provided a structure for reducing optical loss in an optical apparatus (homogenizer) for making the intensity distribution of a laser beam uniform.In a multi-cylindrical lens (a glass substrate having a multiplicity of cylindrical lenses formed thereon) used in a homogenizer, convex cylindrical lenses and concave cylindrical lenses are arranged alternately, and the boundaries between the cylindrical lenses have a smooth structure. This makes it possible to reduce scattering of beams that has occurred at the boundaries between the cylindrical lenses.
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