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Diffraction gratings are designed to separate specific wavelengths of light from broadband illumination sources such as incandescent lights or sunlight. When illuminated, diffraction gratings display the familiar color spectrum of a rainbow, acting like a prism to separate light into parts based on wavelength. Separating the incident light into specific wavelengths allows the subsequent selection of the wavelength(s) required for the application. Every modern spectrophotometer includes a diffraction grating and yet, despite being used commercially for over 60 years, practical and efficient characterization of diffraction gratings has been challenging. 

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