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

Furqan L. Chiragh; Oleg A. Konoplev; Alexey A. Vasilyev; Demetrios Poulios; Mark A. Stephen; Michael A. Krainak

doi:10.1117/12.2030364

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

Furqan L. Chiragh, Oleg A. Konoplev, Alexey A. Vasilyev, Demetrios Poulios, Mark A. Stephen, Michael A. Krainak

Author Affiliations +

Proceedings Volume 8885, Laser-Induced Damage in Optical Materials: 2013; 88850P (2013) https://doi.org/10.1117/12.2030364
Event: SPIE Laser Damage, 2013, Boulder, Colorado, United States

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, Oleg A. Konoplev, Alexey A. Vasilyev, Demetrios Poulios, Mark A. Stephen, and 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); https://doi.org/10.1117/12.2030364

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KEYWORDS

Silica

Laser induced damage

Laser damage threshold

Pulsed laser operation

Charge-coupled devices

Refractive index

Laser systems engineering

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