Request InfoSpecial Optics Inc.Special Optics' in-line beam steerers are convenient devices that precisely change the angle or alignment of optical beams. Unlike Risley prisms, in-line beam steerers move a beam in a cartesian coordinate system rather than in a polar coordinate system. With a single adjustment, they deflect the beams horizontally or vertically, making them much easier to use, compared with the typical two-mirror setup. The in-line beam steerer is an adjustable wedge formed by a planoconcave and a planoconvex lens that are joined using a thin layer of index-matching fluid. 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