FTI has extensive machining and glass forming equipment to manufacture a wide variety of optical rod and specialty tapers ideal for dental and industrial curing applications.
When single optical rods or “Multi element” rods are tapered, the resulting optical characteristic of the rod changes, maintaining the NA of the normal end, while increasing the light gathering ability at the tapered end. The amount of change is a ratio of the diameters. If a .25″ diameter rod has an NA of .5, and the rod is tapered to .125″ diameter, the NA change is 50% (.125/.250) at the small end, making the new NA 1.
Therefore, when light enters the small end of a taper, the emerging beam at the other end is somewhat collimated, when compared to the original range of entry angles.
Tapers are used in myriad of applications. When used in a fiberscope, the taper serves to increase the NA of the illumination fiber to better match the NA of the scope fiber, which is designed to emit in a wide pattern.
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