Request InfoGT Advanced Technologies, Advanced Materials GroupGT Crystal Systems is continuing the production of its ultrahigh-purity, low-absorption, superior-homogeneity sapphire called LAOS (Low Absorption Optical Sapphire). This sapphire material is grown in a unique process that provides the world’s highest-quality optical sapphire. LAOS excels in UV, VUV, AO and high-energy laser systems that cannot tolerate photon absorption. The material is available as stock windows and built to your unique specifications. 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