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Sensing Fabrication Errors in Diffraction Gratings using High Dynamic Range Imaging

Published

Author(s)

Sofia C. Corzo Garcia, Johannes A. Soons, Ulf Griesmann

Abstract

We describe the design of a simple instrument for the identification and characterization of fabrication errors in diffraction gratings. The instrument uses an uncooled charge-coupled device (CCD) camera and a high dynamic range imaging process to detect the light scattered off a grating under test in the focal plane of a lens. We demonstrate that the instrument can achieve a dynamic range around nine orders of magnitude and we show that we are able to identify small, periodic fabrication errors in two test gratings that could not be detected with microscopic techniques.
Citation
Optics Express
Volume
27
Issue
15

Keywords

Diffraction gratings, High dynamic range imaging, Fabrication errors
Created July 19, 2019, Updated July 23, 2019