Journal
APPLIED OPTICS
Volume 45, Issue 1, Pages 144-150Publisher
OPTICAL SOC AMER
DOI: 10.1364/AO.45.000144
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The depth of focus of the Gaussian beam is extended by introducing a wavefront phase correction with properly designed diffractive optical elements. Results of the computer simulations show that, compared with other methods, the presented method demonstrates a reduced focal spot size and low sidelobes in a focal domain, within a considerable range of defocusing distances. Experimental results for the visible range diffractive optical element with a focus of 40 mm and a depth of focus that extends to 1 mm agree with the theory. (c) 2006 Optical Society of America.
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