14 November 2013 Examination of multi-shot laser induced damage on uncoated fused silica substrates at the surface and in the bulk material using P-polarized 1 ns 1.5 kHz laser pulses at 1064 nm
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Abstract
In this paper, we present laser damage threshold testing performed on Un-Coated Fused Silica (SiO2) substrates after multiple laser pulse irradiation. We will outline our methods of testing and observation of laser damage. Using carefully prepared 1” optical flats with 0.25” thickness, we observe competition between laser damage on the surface and in the bulk of the optic. Damage in the bulk is observed at the level of approximately 40-50 J/cm2 when irradiated with 1,000- 3,000 shots per site. Damage appears initially on the back surface of the substrate (without visible damage to the front/focused surface) and propagates slowly in time through the bulk towards the front of the optic. We believe this is due to self-focusing of the laser beam in the bulk material. An understanding of surface damage threshold has important consequences for applications, such as LIDAR, laser machining, and the lifetime of optical components. This work was done within the laser mission testing for NASA’s Ice, Cloud, and land Elevation Satellite-II (ICESat-II) program at Goddard Space Flight Center in Greenbelt, MD.
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Furqan L. Chiragh, Furqan L. Chiragh, Oleg A. Konoplev, Oleg A. Konoplev, Alexey A. Vasilyev, Alexey A. Vasilyev, Demetrios Poulios, Demetrios Poulios, Mark A. Stephen, Mark A. Stephen, Michael A. Krainak, Michael A. Krainak, } "Examination of multi-shot laser induced damage on uncoated fused silica substrates at the surface and in the bulk material using P-polarized 1 ns 1.5 kHz laser pulses at 1064 nm", Proc. SPIE 8885, Laser-Induced Damage in Optical Materials: 2013, 88850P (14 November 2013); doi: 10.1117/12.2030364; https://doi.org/10.1117/12.2030364
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