Adaptive optics for intra-volume engraving of glass with ultra-short laser pulses

Gaudfrin, Kevin; Díaz, Roberto Ruiz; Beaugrand, Guillaume; Bucourt, Samuel; Kling, Rainer

doi:10.2351/1.5138168

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Laser Damage Set-up1

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2023

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“…The bulk engraving method was similar to the process described in Ref. [27]. The laser beam was focused at several depths varying between 0 and 1 mm below the surface of the sample (Figure 5 in Appendix).…”

Section: Laser Damage Set-upmentioning

confidence: 99%

Estimation of laser-induced damage depth from surface image features

et al. 2023

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In laser damage experiments, damage initiation and growth are typically monitored by imaging the surface of the tested fused silica sample, ignoring their bulk morphology. The depth of a damage site in fused silica optics is considered to be proportional to its equivalent diameter. However, some damage sites experience phases with no diameter changes but growth in the bulk independently from their surface. A proportionality relationship with the damage diameter does not accurately describe the growth of such sites. In the following, an accurate estimator for damage depth is proposed, which is based on the hypothesis that the light intensity scattered by a damage site is proportional to its volume. Such an estimator, using the pixel intensity, describes the change of damage depth through successive laser irradiations, including phases in which depth and diameter variations are uncorrelated.

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Section: Laser Damage Set-upmentioning

confidence: 99%