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Handling Diffraction Grating

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Handling Diffraction Grating

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A diffraction grating is a first surface optic, so its surface cannot be touched or otherwise come in contact with another object without damaging it and perhaps affecting its performance. Damage can take the form of contamination (as in the adherence of finger oils) or distortion of the microscopic groove profile in the region of contact. This Technical Note describes the reasons why a grating must be handled carefully and provides guidelines for doing so.Never touch the grooved surface of a diffraction grating. Contact with the ruled area of a grating will damage its groove structure. Handle a grating by holding it by its edges. If possible, use powder free gloves while handling gratings.Never allow any mount or cover to come in contact with the grooved surface of a diffraction grating. A grating that will be shipped should have its surface protected with a specially-designed cover that does not touch the surface itself. Gratings that are not in use, either in the laboratory or on the manufacturing floor, should be kept in a closed box when not covered.Do not talk or breathe over the grooved surface of a diffraction grating. Wear a nose and face mask when it is required that you talk over the surface of a grating.

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