Normally, beam alignment in a FiberBench is effected using the FiberPorts. However, Tweakers offer an alternate means of x-y and w-u control of beam alignment. The X-Y Tweaker consists of a precision polished, AR coated plane-parallel plate mounted on a magnetic ball-and-socket, and is thus able to be rotated and tilted in nearly any orientation. The beam is consequently displaced parallel to itself as much as ±250 µm with hyperfine precision. Tilting beyond 30° can affect insertion loss because of AR coating angular dependence. The phi-rho Tweaker consists of two precision polished, AR coated wedges in a dual rotary mount that permits independent rotation of each wedge. Thus, the combined angular displacement of the pair can be controlled with hyperfine precision anywhere within a 0.5° cone. In addition to aligning a FiberBench or FiberTable, Tweakers are often used to steer a beam in free-space applications.
Aperture Plates
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Optics
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