Quasi-achromatic Fresnel zone lens with ring focus.
Citations
38 citations
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...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
189 citations
"Quasi-achromatic Fresnel zone lens ..." refers background 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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144 citations
"Quasi-achromatic Fresnel zone lens ..." refers background in this paper
...65 times the diffraction-limited value [5]....
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...Therefore, axicons are normally used together with a lens [5,7]....
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127 citations
70 citations
"Quasi-achromatic Fresnel zone lens ..." refers background in this paper
...A binary fraxicon (BF) with a period of Λ can generate a ring pattern [6,9]....
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