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The Blaze Arrow

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The Blaze Arrow

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Many Diffraction Grating are marked with an arrow to aid in their placement in optical systems. This Technical Note explains the meaning behind the arrow.A diffraction grating whose surface-relief groove profile is asymmetric will exhibit efficiency characteristics that depend on the orientation of the grating in the optical system, and such gratings are therefore called blazed gratings. When a blazed grating is oriented such that its efficiency in use is high, it is said to be used "on blaze". The proper orientation of a blazed grating is indicated by its blaze arrow.

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