Can be made from most optical materials
Two axicons together produce a thick-walled hollow “pipe” of light. An axicon followed by a spherical lens produces an annular focus. The axicons can be used to convert a parallel laser beam into a thick-walled hollow “pipe” of light or to produce an annular focus.
Geometry/curvature : conical, axicon
Material : glass
Optical characteristics : visible
Diameter : Min.:
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