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We present a phase mask that substantially reduces the influence of focus error of an optical system; while preserving light gathering power, and lateral resolution. Numerical simulations and first experimental results are shown.
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Jorge Ojeda-Castaneda, Albertina Castro, Javier Santamaria, "Phase mask for high focal depth," Proc. SPIE 3749, 18th Congress of the International Commission for Optics, (19 July 1999); https://doi.org/10.1117/12.355052