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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 le...
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Citations
... Refractive axicons were not extensively investigated in imaging applications; some of the few investigations used a combination of a regular axicon and a lens in an imaging system [7]. We also successfully used a 10°regular axicon for imaging with a fiberoptics bundle over an extended DOF [14]. In the present paper we investigate, for the first time to our knowledge, imaging applications of refractive logarithmic and Fresnel axicons (some preliminary results were reported in [15]). ...
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.
We have proposed and fabricated a new mid-infrared reflector using the guided-mode resonance (GMR). The GMR reflector consists of subwavelength Ge grating on GaAs substrate with a low-refractive-index SiO x layer in between. With a total thickness of about 2 μm, a near-100% reflectivity at 8 μm has been obtained both theoretically and experimentally.
