Extended focus diffractive optical element for Gaussian laser beams.
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.
Golub
Michael A
MA
Holo-Or, Ltd., Kiryat Weizmann, P.O. Box 1051, Rehovot 76114, Israel.
Shurman
Valery
V
Grossinger
Israel
I