FIELD: machine building.
SUBSTANCE: at least one laser is used to make through opening with inner symmetric part and asymmetric diffuser with cross-section departing from that of said inner part. Laser angular position relative to substrate is varied only five times. At second angular position polyhedron is removed, in particular, polyhedron with five surface while at third angular position polyhedron with five surfaces is removed.
EFFECT: ruled out damaging of opening side surface by laser beam.
32 cl, 11 dwg
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