FIELD: physics.
SUBSTANCE: when two diffraction optical elements are placed next and parallel to each other at a certain distance, the combination optically corresponds to a single diffraction optical element which acts as a lens, an axicon, a phase changer or a spiral retarder. If one of the diffraction optical elements rotates relative the other about a common central axis, the optical property of the device, for example, focal distance, refractive power, spiral index or phase shift, varies continuously.
EFFECT: high efficiency and compactness.
20 cl, 15 dwg
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