Densification of sol-gel silica glass by laser irradiation

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Abstract
The results of studies into the interaction between sol-gel prepared silica and 1O.6μm wavelength laser radiation are presented. Hardening of the silica has been measured up to the value for fused silica. The lower densification and upper damage (bloating) thresholds were measured as 4.3 ± 0.2 and 6.3 ± 0.3 J cm -2 of surface irradiated. A reflectivity refractometer has been developed to measure the refractive index of sol-gel surfaces and inconsistencies in the surface were detected resulting in variations in point-to-point measurements.

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