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Characterization of Diffraction Grating Imaging Quality

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Characterization of Diffraction Grating Imaging Quality

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In Concave Diffraction Gratings, we formulated the optical imaging properties of a grating system in terms of wavefront aberrations. After arriving at a design, though, this approach is not ideal for observing the imaging properties of the system. Two tools of image analysis – spot diagrams and linespread functions.Raytracing (using the laws of geometrical optics) is superior to wavefront aberration analysis in the determination of image quality. Aberration analysis is an approximation to image analysis, since it involves expanding quantities in infinite power series and considering only a few terms. Raytracing, on the other hand, does not involve approximations, but shows (in the absence of the diffractive effects of physical optics) where each ray of light incident on the grating will diffract. It would be more exact to design grating systems with a raytracing procedure as well, though to do so would be computationally cumbersome.

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