1 May 1998 Hybrid wedge plate-grating interferometer for collimation testing
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A new type of collimation testing technique using a single wedge plate in conjunction with a dual-field grating has been described. Interference pattern produced by a wedge plate illuminated by the test beam is superposed on a grating to get moire fringes. By using two different types of dual-field gratings, two testing configurations are obtained. These dual-field moire patterns provide self-referencing and improved sensitivity in collimation testing. The principle of the proposed techniques and experimental results are presented.
J. S. Darlin, Mahendra P. Kothiyal, Rajpal S. Sirohi, "Hybrid wedge plate-grating interferometer for collimation testing," Optical Engineering 37(5), (1 May 1998). https://doi.org/10.1117/1.601672 . Submission:

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