Abstract
The intrinsic mid-infrared optical absorption of a ZrF(4)-BaF(2)-LaF(3)-AlF(3)-NaF (ZBLAN) glass has been determined by combining laser calorimetry and spark-source mass spectrographic analysis. The total optical absorption of four samples of varying purity was measured at 3.9 microm with laser calorimetry. The extrinsic contribution to the total absorption for each glass was calculated from the measured concentration of rare-earth impurity ions and known extinction coefficients. The intrinsic absorption of this glass at 3.9 microm determined from the difference between the total measured absorption and the calculated extrinsic absorption is 6.11 (+/-0.61) x 10(-4) cm(-1).
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