Abstract

The optical absorption loss coefficient α of a compound glass from which a fiber is to be drawn is measured in a calorimeter. The experimental embodiment with a cylindrical sample is described. Using an electrically heated Pyrex rod, the dependence of the relaxation time τ₁ and the temperature T₁ on the length of the glass rod and on the thermal parameters of the glass and the surrounding gas is verified experimentally. Using laser heating, agreement is found for Pyrex, fused and synthetic silica, and alkali-germanosilicate glass rods. Synthetic silica behaves capriciously in helium only. The results are compared with the total loss of a silicone-clad fiber drawn with the same glass as a core material.

© 1981 Optical Society of America

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