Building high-damage-threshold surfaces at 351 nm

Néauport, Jérôme; Duchesne, Jacky; Bouchut, Philippe; Lamaignère, Laurent; Bigarré, J.; Daurios, Nathalie

doi:10.1117/12.512956

Cited by 11 publications

(7 citation statements)

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“…Major progress have been made and laser damage densities of fused silica have been significantly decreased [2,3]. The elimination of most contaminants in polishing processes is the first step in this improvement [4].…”

Section: Introductionmentioning

confidence: 98%

Progress in the understanding of fracture related laser damage of fused silica

et al. 2007

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Numerous experimental and theoretical contributions in the past have stressed the detrimental effect of fractures in the generation of surface laser damage sites in fused silica illuminated at 351 nm. However, two very important steps lack for the moment on the way towards a scientific understanding of the role of fractures. 1. a physical model must be developed to predict damage events starting from real defect sites 2. a reproducible measurement must be obtained and compared with calculations.Here we present the theoretical work realized to reach the first goal. Contrary to previous discussions on fractures, the electromagnetic configuration is calculated in the case of a real material, with electronic surface states, bulk defects, and defects dynamics. Due to electromagnetic field enhancement in the fracture, surface defects absorb a sufficient part of laser energy, able to heat silica above the vaporization temperature. This is the initial event that triggers production of more excited states during the pulse, and steep increase of temperature and pressure fields. Comparisons with available experimental results are positive. Calculated fluences of damage initiation are very near those of measured events on engineered fractures, or on real defects in polished samples.

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Section: Introductionmentioning

confidence: 98%

Progress in the understanding of fracture related laser damage of fused silica

et al. 2007

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“…This is confirmed by a recently developed physical model [9] explaining how a clean fracture can trigger damage at the wavelength of 351 nm. Hence, efforts have been made to suppress SSD to improve optics lifetime [10,11].…”

Section: Introductionmentioning

confidence: 99%

Subsurface damage measurement of ground fused silica parts by HF etching techniques

et al. 2009

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Detection and measurement of subsurface damage of ground optical surfaces are of major concern in the assessment of high damage thresholds fused silica optics for high power laser applications. We herein detail a new principle of SSD measurement based on the utilization of HF acid etching. We also review and compare different subsurface damage (SSD) characterization techniques applied to ground and fine ground fused silica samples. We demonstrate good concordance between the different measurements.

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“…2. The energy density required to generate partial tension in the host crystal, which is due to the expansion of the inclusions content [12][13][14].…”

Section: Local Absorption Occurs At All Wavelengthsmentioning

confidence: 99%

Study of the Damage Threshold of Optical Surfaces of High-Power Energy Pulse Lasers with Changing Coefficient of Optical Surface Roughness, and the Damage Threshold is increased by Thermal Treatment of Optical Glass

Marouf¹

2020

J Phy Opt Sci

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This paper presents the measurement of the laser Threshold damage of an optical surface at different roughness coefficients. The study procedure is achieved through the manufacturing of two types of parallel-sided borosilicate plate (Glass Bk7, and SF13). The Laser used is ND: YAG pulsed laser and the longitudinal mode TEM00 laser pulses with pulse width τ =30ns and wave length λ=1.064μm, the laser beam is focused using F=30 mm lens. The concentrated laser beam is guided by a converging lens towards the optical surface of the parallel surface plate. Finally, we obtained a graph of roughness coefficient is drawn in relation the optical Threshold Damage of the optical surface, Before and after processing the optical surface. We were able to raise the threshold by about 15% after conducting thermal treatment of the optical surface

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Building high-damage-threshold surfaces at 351 nm

Cited by 11 publications

References 0 publications

Progress in the understanding of fracture related laser damage of fused silica

Progress in the understanding of fracture related laser damage of fused silica

Subsurface damage measurement of ground fused silica parts by HF etching techniques

Study of the Damage Threshold of Optical Surfaces of High-Power Energy Pulse Lasers with Changing Coefficient of Optical Surface Roughness, and the Damage Threshold is increased by Thermal Treatment of Optical Glass

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