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The purpose of these coatings is to reflect light. Again, depending on the requirements, there are quite a variety of possible designs. Designs based on metal layers are used in many applications. However, the reflectance is not very close to 100% and the coating will be damaged by intense radiation. For very high reflectance, dielectric materials must be used. To obtain wide-band reflectors, designs for different wavelength regions may be coated on top of each other.

The graphic below shows the performance of a 19-layer H(LH)^9 dielectric reflector.

Plot of reflector performance

Here are more examples of reflectors:
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