Abstract
Ray-tracing algorithms have been developed to follow the propagation of a collimated beam of light traveling along and refracting out of a glass rod in a region of monotonically decreasing cross section. These algorithms have been used to study the formation and distribution of caustics as a function of the changing cross-section area. Axial profile data taken from the melt, or drawdown, zone of a solidified fiber-drawing sample provide the geometrical information needed to predict the loci of two major and two minor families of caustics. General principles for relating the observable far-field caustic patterns to the actual shapes of symmetric melt zones in glass samples are discussed.
Published Version
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