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Stability of Repicated Gratings

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Stability of Repicated Gratings

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Gratings replicated onto substrates made of low thermal expansion materials behave as the substrate dictates: the resin and aluminum, which have much higher thermal expansion coefficients, are present in very thin layers compared with the substrate thickness and therefore do not expand and contract appreciably with temperature changes since they are fixed rigidly to the substrate.Instead of a special resin, the metallic coating on a reflection grating made with standard resin is often sufficient to protect the underlying resin from the effects of water vapor. A transmission grating that requires protection from environmental water vapor can be so protected by applying a dielectric coating (e.g., SiO) to its grooved surface.

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