The production of an annular ring of light with a variable diameter has applications in laser material processing and
machining, particle manipulation, and corneal surgery. This can readily be accomplished using a positive and negative
axicon pair. However, negative axicons are very expensive and difficult to obtain with small diameters. In this paper,
we present a design of an annular ring zoom system using two positive axicons. One axicon is placed a distance before a
primary lens that is greater than some prescribed minimum, and the second axicon is placed after the primary lens. The
position of the second axicon determines the ring diameter. The ring diameter can be zoomed from some maximum
design size to a zero diameter ring (spot). Experimental results from a developmental system will be presented.
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