Abstract
We present an alignment technique that exploits angular correlations by employing a pair of masks, which encode in an angular format pseudo-random sequences. The angular correlator generates peaked irradiance distributions on-axis, provided that the elements of the pair are aligned. Otherwise, the on-axis irradiance distribution decreases to a minimum value. Since the proposed angular correlator is independent of the lateral magnification, it is useful for testing the performance of varifocal lenses. A merit function describes the tolerance to focus errors associated with the location of a small size detector. We use linearly polarized films for showing that the technique also works well with broad band light.
© 2017 Optical Society of America
Full Article | PDF ArticleMore Like This
Th. de Graauw and B. P. Th. Veltman
Appl. Opt. 9(12) 2658-2660 (1970)
Robert H. Katyl
Appl. Opt. 11(10) 2278-2285 (1972)
Stefan Bernet, Walter Harm, Alexander Jesacher, and Monika Ritsch-Marte
Opt. Express 19(25) 25113-25124 (2011)