Depth of Focus Enhancement and Twisted Beams Using Radial Harmonic Pupil Filters

It is well known that when a plane wave crosses a simple spherical lens, it is focused at the lens's front focus. When one measures the intensity profile along the optical axis, one sees a bell-like curve around the focus, i.e., a strong intensity peak in the focal point that falls off rapidly as we move away from it on either side. The goal we address is avoiding this typical behavior of the light.

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