In this work, we show how the combination of cascaded multi-value phase diffractive optical elements can form a multi-focal moiré zone plate with tunable optical power in each diffraction order. The rotationally tunable moiré zone plate is capable of generating an array of equal intensity focal spots with a precisely adjustable axial distance along the propagation direction. Numerical simulations as well as experimental results verify that multiple focal spots are generated, and the distance between the generated uniform foci can be adjusted by a mutual rotation of one multi-value phase diffractive element with respect to the other.
Five light sheets of equal intensity are generated within the tube of a flow driven Light Sheet Fluorescence Microscope (LSFM). In combination with a second multi-focal lens multiplane imaging on a single chip is provided.
Light sheet fluorescence microscope with single light sheet illumination enables rapid 3D imaging of living cells. In this paper we show the design, fabrication and characterization of a diffractive optical element producing several light sheets along a 45$^\circ$ inclined tube. The element, which is based on a multi-focal diffractive lens and a linear grating, generates five thin light sheets with equal intensities when combined with a refractive cylindrical lens. The generated uniform light sheets can be applied for the scanning of samples in tubes enabling flow-driven 3D imaging.
A method is proposed for creating a coaxial array of petal-like modes by using a multi focal composite spiral zone plate. The composite diffractive element superimposes two oppositely charged optical vortices to generate a desired number of equal intensity petal-like beams.
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