| 摘要 |
The entire processing apparatus is prevented from growing in size due to the size of an optical effective region of an optical element to be processed. The optical effective region of the optical element is divided into a plurality of divided regions by the dividing line and each divided region is sequentially aligned to the processable region of the ion beam. The entire optical effective region is processed by repeating the process of a raster scan with the ion beam for each divided region in all divided regions. The entire processing apparatus can be made to be small by reducing the scanning range of the ion beam.
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