Impact of two CO_2 laser heatings for damage repairing on fused silica surface

• DOI: 10.1364/oe.18.026068
• Publication Date: 2010-11-30T20:48:25Z
• Authors: P. Cormont; L. Gallais; L. Lamaignère; J. L. Rullier; P. Combis; D. Hebert
• Keywords: [PHYS.PHYS.PHYS-OPTICS] Physics [physics]/Physics [physics]/Optics [physics.optics]; Equipment Failure Analysis; Heating; [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics]; Lasers, Gas; Welding; Equipment Design; 02 engineering and technology; Silicon Dioxide; 0210 nano-technology

CO(2) laser is an interesting tool to repair defects on silica optics. We studied UV nanosecond laser-induced damage in fused silica after CO(2) laser heating. The localization of damage sites and the laser damage threshold are closely related to stress area in silica induced by heating. By applying a suitable second laser heating, we managed to eliminate the debris issued from redeposited silica and to modify the stress area. As a consequence, a significant increase of laser resistance has been observed. This process offers the possibility to improve damage repairing sufficiently to extend the lifetime of the silica components.