Temperature dependence of UV-induced compaction in fused silica

Abstract
Different 1995 - 1996 grade experimental fused silica samples were evaluated for their resistance to UV-induced compaction at 193 nm under elevated sample temperature conditions. Stress induced birefringence was used as a sensitive compaction monitor. We found that compaction rate decreases with increasing sample temperature. Isochronal annealing experiments were performed on two different sets of pre-damaged fused silica samples. Annealing of compaction was observed at temperatures as low as 200 degree(s)C, and an activation energy of 0.1 eV was found.

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