Mitigation of growth of laser initiated surface damage in fused silica using a 4.6-um wavelength laser

Gabe Guss; Isaac Bass; Vaughn Draggoo; Richard Hackel; Steve Payne; Mark Lancaster; Paul Mak

doi:10.1117/12.696084

15 January 2007 Mitigation of growth of laser initiated surface damage in fused silica using a 4.6-micron wavelength laser

Gabe Guss, Isaac Bass, Vaughn Draggoo, Richard Hackel, Steve Payne, Mark Lancaster, Paul Mak

Author Affiliations +

Proceedings Volume 6403, Laser-Induced Damage in Optical Materials: 2006; 64030M (2007) https://doi.org/10.1117/12.696084
Event: Boulder Damage Symposium XXXVIII: Annual Symposium on Optical Materials for High Power Lasers, 2006, Boulder, Colorado, United States

Abstract

Surface damage caused by high fluence, 351 nm light to fused silica optics can adversely affect the performance of fusion class laser systems like that of the National Ignition Facility (NIF). It is typically initiated as a small pit and grows in both diameter and depth during normal operation with cracks that extend into the bulk. Mitigation of this growth has been previously reported using a 10.6 micron CO₂ laser. Here, we report growth mitigation with the 4.6 micron light from a frequency-doubled, 9.2 micron CO₂ laser. The motivation for using 4.6 microns is >25 times longer absorption length in fused silica at room temperature compared to that at 10.6 micron. Mitigation of subsurface cracks at 10.6 micron required ablation of material to the depth of the cracks. In contrast, it was possible to mitigate the subsurface cracks using 4.6 micron light without significant ablation of material. Damage sites as large as 500 microns in diameter with cracks extending to 200 microns in depth were successfully mitigated with 4.6 microns.

Citation Download Citation

Gabe Guss, Isaac Bass, Vaughn Draggoo, Richard Hackel, Steve Payne, Mark Lancaster, and Paul Mak "Mitigation of growth of laser initiated surface damage in fused silica using a 4.6-micron wavelength laser", Proc. SPIE 6403, Laser-Induced Damage in Optical Materials: 2006, 64030M (15 January 2007); https://doi.org/10.1117/12.696084

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