Interferometric Studies of Fibers

Abstract

Interferometric determination of the principal refractive indices for light vibrating parallel and perpendicular to the fiber axis and the birefringence for Acrilan® have been carried out. Multiple-beam Fizeau fringes in transmission were used for fibers of irregular cross sections. A new method suitable for evaluating small birefringence in fibers was applied. Variation of refractive index with temperature was also determined. The fringes of equal chromatic order were applied for determining the birefringence of the fibers with diameters of 15-40 microns.

Determination of the Spectral Dispersion Curves of Highly Oriented Fibers Using Multiple-Beam Microinterferometry

“…Multiple-beam Fizeau fringes [4,5] is an accurate interferometric technique to measure the optical properties of fibers. This technique is extensively used to determine the mean refractive index n of fibers using the following equation [10]:…”

“…Barakat and El-Hennawi [5] describe an optical set-up for producing multiple-beam Fizeau fringes in transmission. The wedge interferometer consists of two circular optical flats of flatness AE0.01 mm, the inner surface of each flat is coated with highly reflecting, partially transmitting silver layer.…”

“…Multiple-beam technique is an accurate interferometric technique to measure the optical properties of fibers [4][5][6][7]. Using this interferometric technique, the highly oriented fibers give large optical path length differences.…”

Interferometric studies on the influence of temperature on the optical and dispersion parameters of GRIN optical fibre

“…It has a remarkable influence in producing a long-distance and low loss optical fibre. Barakat et al [2] applied multiple-beam interference fringes of the Fizeau type to obtain the values of the shape parameter a and the refractive index difference D. Several techniques have been used to determine the refractive index, dispersion and other parameters of fibres [3][4][5].…”

Limit Theorems for Decomposable Branching Processes With Final Types

“…MBFFs formed across a fibre material when immersed in a silvered liquid wedge illuminated by a parallel beam of monochromatic light have been used to measure the refractive index and birefringence of natural and synthetic fibres [3][4][5][6][7]. These fringes have also been used to examine the layer structure of graded index fibre [8].…”