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Diffraction grating handbook
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Please review our Terms and Conditions of Use and check box below to share full-text version of article. Summary The diffraction grating is a component consisting of periodically repeating elementary structures. Related Information. Close Figure Viewer.
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Diffraction Grating Handbook by Palmer Christopher a
New Password. Since this condition can only exactly be achieved for one wavelength, it is specified for which blaze wavelength the grating is optimized or blazed.
The direction in which maximum efficiency is achieved is called the blaze angle and is the third crucial characteristic of a blazed grating directly depending on blaze wavelength and diffraction order. The grating lines possess a triangular, sawtooth-shaped cross section, forming a step structure. The blaze angle is optimized to maximize efficiency for the wavelength of the used light.
Commonly blazed gratings are manufactured in the so-called Littrow configuration. The Littrow configuration is a special geometry in which the blaze angle is chosen such that diffraction angle and incidence angle are identical. The beams are perpendicular to the step and therefore parallel to the step normal. Diffraction angles at the grating are not influenced by the step structure.
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They are determined by the line spacing and can be calculated according to the grating equation :. Blazed gratings can also be realized as transmission gratings. In this case the blaze angle is chosen such that the angle of the desired diffraction order coincides with the angle of the beam refracted at the grating material.
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