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Optical Engineering

Hybrid wedge plate-grating interferometer for collimation testing
Author(s): J. S. Darlin; Mahendra P. Kothiyal; Rajpal S. Sirohi
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Paper Abstract

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.

Paper Details

Date Published: 1 May 1998
PDF: 6 pages
Opt. Eng. 37(5) doi: 10.1117/1.601672
Published in: Optical Engineering Volume 37, Issue 5
Show Author Affiliations
J. S. Darlin, Indian Institute of Technology (India)
Mahendra P. Kothiyal, Indian Institute of Technology (India)
Rajpal S. Sirohi, Indian Institute of Technology (India)


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