1 December 2007 Application of Fresnel diffraction to nondestructive measurement of the refractive index of optical fibers
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Optical Engineering, 46(12), 128001 (2007). doi:10.1117/1.2819745
Abstract
A nondestructive technique, based on Fresnel diffraction from phase objects, is proposed for specifying the refractive indices of optical fibers without requiring index matching liquid. The method involves measurement of normalized intensity distribution on the Fresnel diffraction pattern of a monochromatic plane wave diffracted from a fiber, and evaluation of the fiber core refractive index from the intensity distribution by the least-square method. It is also shown that for the case of an unknown fiber core radius, by fitting a suitable theoretical intensity distribution on the corresponding experimental intensity distribution, the core radius and refractive index can be obtained with reasonable accuracy. Simulation and experimental studies show that the technique is reliable and quite sensitive to refractive index change.
Arash Sabatyan, Mohammad Taghi Tavassoly, "Application of Fresnel diffraction to nondestructive measurement of the refractive index of optical fibers," Optical Engineering 46(12), 128001 (1 December 2007). http://dx.doi.org/10.1117/1.2819745
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KEYWORDS
Near field diffraction

Refractive index

Chlorine

Optical fibers

Step index fibers

Charge-coupled devices

Diffraction

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