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Characterization of a refractive logarithmic axicon

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Abstract

We show that it is feasible to design and manufacture a refractive logarithmic axicon that generates a quasi- diffraction-free/Bessel beam with nearly constant beam size and intensity over a predetermined range. The novel optical element was characterized with both coherent and incoherent light, and good correspondence with the predicted behavior of the intensity distribution and spot size was found. The energy flow was also found to be nearly constant over most of the designed range. Logarithmic axicons may find applications in situations where large depth of field and uniform axial intensity/energy distributions are important.

© 2010 Optical Society of America

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