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METHOD AND APPARATUS FOR WAVEFRONT SENSING

United States Patent Application

20170038261
A1
View the Complete Application at the US Patent & Trademark Office
A method for performing optical wavefront sensing includes providing an amplitude transmission mask having a light input side, a light output side, and an optical transmission axis passing from the light input side to the light output side. The amplitude transmission mask is characterized by a checkerboard pattern having a square unit cell of size .LAMBDA.. The method also includes directing an incident light field having a wavelength .lamda. to be incident on the light input side and propagating the incident light field through the amplitude transmission mask. The method further includes producing a plurality of diffracted light fields on the light output side and detecting, at a detector disposed a distance L from the amplitude transmission mask, an interferogram associated with the plurality of diffracted light fields. The relation 0 < L < 1 8 .LAMBDA. 2 .lamda. or 1 4 .LAMBDA. 2 .lamda. ( 2 n - 1 ) < L < 1 4 .LAMBDA. 2 .lamda. ( 2 n + 1 ) ##EQU00001## is satisfied, where n is an integer greater than zero.
Bahk, Seung-Whan (Rochester, NY)
RAM Photonics, LLC (San Diego CA)
15/ 209,535
July 13, 2016
STATEMENT AS TO RIGHTS TO INVENTIONS MADE UNDER FEDERALLY SPONSORED RESEARCH AND DEVELOPMENT [0002] This invention was made with Government support under Contract No. DE-FC52-08NA28302 awarded by the United States Department of Energy. The Government has certain rights in the invention.