The imaging properties of three types of refractive axicons are examined by using them in an imaging system. A linear axicon, a logarithmic axicon, and a Fresnel axicon are characterized by determining their point spread functions (PSFs) experimentally and by numerical simulation. The PSFs, which vary along the depth of field for the cases considered in the present investigation, are used in digital filters to denoise the images. A comparison of the imaging performance of these three optical elements is presented.
It is shown that an axicon telescope system preserves isotropy and scaling in both the transverse and longitudinal directions as opposed to regular lens telescopes. Also, a coherent fiber optics imaging bundle was used with an axicon lens permitting viewing with an extended depth of field as compared to using a fiber optics bundle with a regular lens.Axicon, Telescope, Bessel beam, Fiber-optics imaging.
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