Annual apodizers for low sensitivity to defocus and to spherical aberration

Optics Letters (Impact Factor: 3.29). 08/1986; 11(8):487-489. DOI: 10.1364/OL.11.000487


We propose a method for designing apodizers that increase the depth of focus and reduce the influence of spherical aberration. These two properties are explicitly manifested in computer-generated pictures and values of the Strehl ratio for variable spherical aberration.

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Available from: Jorge Ojeda-Castaneda, Apr 16, 2015
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    • "However, DOF is an important property in many optical systems, such as laser ablation, lithography, microscopy and optical data storage, with a requirement of large DOF. Many methods have been proposed for the purpose of increasing DOF, for example annular aperture [6] [7], shade mask [8] [9] [10] [11] [12], quasi-bifocus [13] [14], and image-processing [15] [16]. "
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    ABSTRACT: We propose a new parameter w for optimization of foci distribution of conventional fractal zone plates (FZPs) with a greater depth of focus (DOF) in imaging. Numerical simulations of DOF distribution on axis directions indicate that the values of DOF can be extended by a factor of 1.5 or more by a modified quasi-FZP. In experiments, we employ a simple object–lens–image-plane arrangement to pick up images at various positions within the DOF of a conventional FZP and a quasi-FZP, respectively. Experimental results show that the parameter w improves foci distribution of FZPs in good agreement with theoretical predictions.
    Optics & Laser Technology 10/2012; 44(7):2140–2144. DOI:10.1016/j.optlastec.2012.03.012 · 1.65 Impact Factor
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    ABSTRACT: Apodizers with relatively high transmittance over an annular region of the exit pupil can reduce the sensitivity to defocusing and to spherical aberration [Opt. Lett. 11, 487 (1986)]. Here, we analyze the imaging properties (pupil functions, point spread functions, optical transfer functions, and Strehl ratios) of the Bessel type of annular apodizers. We also show some computer-simulated images, obtained with and without this kind of annular apodizer.
    Applied Optics 07/1987; 26(14):2770-2. DOI:10.1364/AO.26.002770 · 1.78 Impact Factor
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