Abstract

Laser light scattering from fused silica fibers, with radii in the hypermicrometer range (1–10 μm) has been studied. The vertical polarized component of the scattered radiation has been observed over an angular range from 2° to 135°, the angular resolution being 0°.3. The experiments were carried out using the discrete visible wavelength lines from a Kr+ ion laser. The experimentally observed total number of minima in the angular range between 0° and 90° has been compared with computations based on the model of an infinitely long circular cylinder. In this way it is possible to perform a fast and accurate (better than 1%) determination of fiber radii without the necessity of calibration, over a large range of physical acceptable refractive indices. Alternatively, measuring the near forwardscattering over a carefully predetermined collecting aperture suffices to estimate quickly the fiber radius to within 5.0% over the same refractive index range. When the refractive index is known beforehand, the accuracy of both methods can be improved to within 0.5% and 2%, respectively. When a full comparison with the theoretical angular scattering curves is performed, the fiber radius is obtained with an accuracy better than 0.1%, as well as the refractive index. The full curves are calculated by Dave’s computational procedure adapted for cylinders.

© 1979 Optical Society of America

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