Optic crystals
Encyclopedia
Optic crystals are crystals that can be used to direct a beam of light
Light
Light or visible light is electromagnetic radiation that is visible to the human eye, and is responsible for the sense of sight. Visible light has wavelength in a range from about 380 nanometres to about 740 nm, with a frequency range of about 405 THz to 790 THz...

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Optic crystals can work as directional guides to the light in photonic devices.

Opticmechanics deals with the grinding, polishing and refining of optic crystals.
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