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
18 citations
"Quasi-achromatic Fresnel zone lens ..." refers background or methods in this paper
...A FZL is designed to be a phase-only element [1,19] in the u − v configuration [18] for the phase condition shown in 1559-128X/14/091970-05$15....
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...Therefore, no additional collimating optics is required [18]....
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...The difference in these valuesmay be due to fabrication errors and any remaining spherical aberration [18]....
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...The spherical aberration introduced by the glass substrate on which the device is fabricated is corrected by modifying the radius of BFZL according to [18]....
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...(2) and (7) after applying suitable aberration correction [18]....
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8 citations
"Quasi-achromatic Fresnel zone lens ..." refers background in this paper
...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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"Quasi-achromatic Fresnel zone lens ..." refers methods in this paper
...Recently, composite optical elements using FZLs have been reported for applications in photomixing generation of THz radiation and optical trapping [12,13]....
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