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    The names ruby and sapphire are not marketing driven; they are color terms that long predate the development of chemistry to the point where we could determine what gems were. Many famous historical "rubies" are not corundum but spinel; they were called rubies because "ruby" was the term for any red gemstone. "Moissanite" is purely marketing ...

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    4. Active Electro-Optical Component Technologies. As has been described in Chapters 2 and 3, current and emerging active electro-optical (EO) sensing systems are implemented in many different modalities.All require components such as lasers, detectors, optics, and processing techniques to generate photons, bounce them off targets, and transform detected photons into usable information.

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