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physical object > artifact > device > instrument > optical device > wavefront modifier > spectrograph dispersing element > diffraction grating > blazed grating
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blazed grating comparison table
Subject is a kind of has definition
diffraction gratingspectrograph dispersing elementAn optical device containing thousands of very fine parallel grooves which produce interference patterns in a way which separates out all the components of the light into a spectrum.
blazed gratingdiffraction gratingDiffraction grating so ruled that the reflected light is concentrated into only a few orders, or even a single order, of the spectrum.

Next diffraction gratingechelle    Updiffraction grating    Previous diffraction gratingobjective grating