Abstract

In this lecture, principle of fundamentally breaking the diffraction barrier through reversible saturable optical (fluorescence) transitions (RESOLFT) is discussed. In these concepts, the diffraction barrier is broken by a saturated optical transition (depletion) between two states of a marker, whereby the transition is effected with an intensity distribution featuring one or more intensity minima (zero). The saturation level defines the size of the ultrasharp focal spot and/or the concomitantly enlarged bandwidth of the optical transfer function (OTF).

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