Quasi-achromatic Fresnel zone lens with ring focus.
Citations
38 citations
Cites background from "Quasi-achromatic Fresnel zone lens ..."
...Quasi-achromatic lenses with capabilities to change focal distance by changing wavelength wavelength have been investigated [7]....
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Cites background from "Quasi-achromatic Fresnel zone lens ..."
...Therefore, the increase in diffraction angle of the spiral axicon and the decrease in focal length of the FZL cancel each other out, resulting in a wavelength independent diameter of the flower-like pattern.(33) The wavelength dependency is analyzed for a variation of wavelength by 50 nm for Λ 1⁄4 190 μm....
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...The combination of a binary axicon with a binary FZL enables the wavelength independent ring diameter property.(33) As seen earlier,(33) when the wavelength changes, the diameter of the irradiance profile remains constant although there is a shift in the focal plane position....
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References
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"Quasi-achromatic Fresnel zone lens ..." refers background in this paper
...The value of the phase (Φ1 or Φ2) controls the efficiency of the BFZL [15] or the BF....
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...Fresnel axicons (fraxicons) [14,15] and diffractive axicons [16,17] for generation of Bessel beams and ring patterns have also been proposed and demonstrated....
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19 citations
19 citations