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Fiber laser — A fiber laser or fibre laser is a laser in which the active gain medium is an optical fiber doped with rare earth elements such as erbium, ytterbium, neodymium, dysprosium, praseodymium, and thulium. They are related to doped fiber amplifiers,… … Wikipedia
spectroscopy — spectroscopist /spek tros keuh pist/, n. /spek tros keuh pee, spek treuh skoh pee/, n. the science that deals with the use of the spectroscope and with spectrum analysis. [1865 70; SPECTRO + SCOPY] * * * Branch of analysis devoted to identifying… … Universalium
ARAD — (Heb. עֲרָד), an important biblical city in the eastern Negev which controlled the main road to Edom and Elath. Ancient Arad The Canaanite, the king of Arad, who dwelt in the South (Negev) prevented the Israelite tribes from penetrating into… … Encyclopedia of Judaism

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