Browsing by Author "Hilden, Panu"

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  • Extended depth of field of an imaging system with an annular aperture
    (2023-03-27) Hilden, Panu; Shevchenko, Andriy
     A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    A common drawback of high-resolution optical imaging systems is a short depth of field. In this work, we address this problem by considering a 4f -type imaging system with a ring-shaped aperture in the front focal plane of the second lens. The aperture makes the image consist of nearly non-diverging Bessel-like beams and considerably extends the depth of field. We consider both spatially coherent and incoherent systems and show that only incoherent light is able to form sharp and non-distorted images with extraordinarily long depth of field.