CPC G02B 5/1814 (2013.01) [B23K 26/0652 (2013.01); G02B 5/20 (2013.01); G02B 27/0944 (2013.01); G02B 27/0988 (2013.01)] | 16 Claims |
1. A spatial frequency filter device for use with a laser beam, the spatial frequency filter device comprising:
a neutral region, which is configured to transmit or reflect the laser beam; and
a deflecting region, which radially adjoins the neutral region and is configured to deflect beam components of the laser beam from a beam axis of the laser beam,
wherein the deflecting region has a constant portion, in which a deflecting effect on the beam components of the laser beam for each location in the constant portion is configured to be independent of a distance of a location from the neutral region, and
wherein the deflecting region has a variation portion, in which the deflecting effect on the beam components of the laser beam is configured to vary, dependent on a distance from the neutral region.
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