Sofia C. Corzo-Garcia,1 Muhammad Imran Afzal,2 Benjamin T. Kidder,3 Michelle A. Grigas,3 Ulf Griesmann1
1National Institute of Standards and Technology (United States) 2Gwangju Institute of Science and Technology (United States) 3The Univ. of Texas at Austin (United States)
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We report on recent progress in the development of our focal plane imaging system for the detection and characterization of small fabrication errors in diffraction gratings. The instrument uses a purpose-designed high dynamic range imaging method in conjunction with a low-cost digital camera to acquire images with a dynamic range that can now exceed eight orders of magnitude. The sensitivity and utility of the instrument is demonstrated with measurements of three different diffraction gratings. Avenues for further possible improvements of the instrument are discussed.
Sofia C. Corzo-Garcia,Muhammad Imran Afzal,Benjamin T. Kidder,Michelle A. Grigas, andUlf Griesmann
"A high dynamic range imaging method for the characterization of periodic errors in diffraction gratings", Proc. SPIE 10750, Reflection, Scattering, and Diffraction from Surfaces VI, 1075009 (4 September 2018); https://doi.org/10.1117/12.2321227
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Sofia C. Corzo-Garcia, Muhammad Imran Afzal, Benjamin T. Kidder, Michelle A. Grigas, Ulf Griesmann, "A high dynamic range imaging method for the characterization of periodic errors in diffraction gratings," Proc. SPIE 10750, Reflection, Scattering, and Diffraction from Surfaces VI, 1075009 (4 September 2018); https://doi.org/10.1117/12.2321227