Critical problem of cadmium fluorochloride glass fiber drawing

Guoyin Zhang; Jia Jiang; Marcel Poulain; Jose Renato Delben; Angela A.S. Delben

doi:10.1117/12.323397

28 September 1998 Critical problem of cadmium fluorochloride glass fiber drawing

Guoyin Zhang, Jia Jiang, Marcel Poulain, Jose Renato Delben, Angela A.S. Delben

Proceedings Volume 3416, Infrared Glass Optical Fibers and Their Applications; (1998) https://doi.org/10.1117/12.323397
Event: Lasers and Materials in Industry and Opto-Contact Workshop, 1998, Quebec, Canada

Abstract

Cadmium fluorochloride glass (CdFCl) is considered as a more favorable host for Pr³⁺ ¹G₄-³H₅ transition than all-fluoride hosts, but it cannot be drawn easily into fibers. This critical problem is largely correlated with its special devitrification behavior and temperature dependence of viscosity. The high Avrami coefficients of crystallization obtained by isothermal method and by non-isothermal method suggest that nucleation rate increases during the crystallization. Meanwhile Avrami coefficients and activation energy values vary with the crystalline fraction. This corresponds to the formation of different phases during crystallization. The the ram XRD measurements performed from 210 to 320 degrees C confirm that chlorine-rich phases appear first at low temperature while the fluoride phases form lately. Comparison with fluorozirconate glass shows that CdFCl glass has a lower log (eta) - T slope. As a result the drawing temperature of the CdFCl glass is well above Tg, in the crystallization thermal range. These two factors explain the difficulties encountered in drawling CdFCl fibers from a preform. Drawing fibers directly from the melt should be an alternative method for CdFCl glasses.

Citation Download Citation

Guoyin Zhang, Jia Jiang, Marcel Poulain, Jose Renato Delben, and Angela A.S. Delben "Critical problem of cadmium fluorochloride glass fiber drawing", Proc. SPIE 3416, Infrared Glass Optical Fibers and Their Applications, (28 September 1998); https://doi.org/10.1117/12.323397

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