Optics and Optical Coatings
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Silicon is a monocrystal mainly used in semiconductors and does not absorb in the IR range from 1.2 µm to 6 µm.
Germanium as a monocrystal, which is mainly used in semiconductors, is non-absorbing in IR ranges from 2 µm to 20 µm.
Corner cubes have the property that light incident on the prism face is deflected 180 degrees regardless of its angle of incidence.

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The internal reflection type parabolic lens is an optical element that can collect light on the emitting end surface when incident light from different directions is reflected from the streamlined side surface.

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Dove prisms have the useful property of completely inverting an image by 180 degrees.