On the abnormal temperature dependent elastic properties of fused silica irradiated by ultrafast lasers

Vlugter, Pieter; Bellouard, Yves

doi:10.48550/arxiv.2202.01886

Cited by 1 publication

(1 citation statement)

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“…It was also found that the densification inside the laser affected zone (LAZ) is higher than the densification due to homogeneous modification, a densification exposure regime found at shorter pulse duration and lower pulse energy 28 . Using the same method proposed by 22 and used for a the first estimate of the pressure in between the beams, we estimated a pressure approaching 15 GPa, see Fig 6.This estimate is based on the assumption of an hydrostatic pressure and therefore, most likely underestimates what the real pressure was, as the loading case is present for a short duration and.…”

Section: Modification Along the Laser Affected Zonementioning

confidence: 99%

Femtosecond laser-shockwave induced densification in fused silica

Radhakrishnan¹,

Gateau²,

Vlugter³

et al. 2022

Preprint

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Tightly focused femtosecond laser-beam in the non-ablative regime can induce a shock-wave enough to reach locally pressures in the giga-Pascal range or more. In a single beam configuration, the location of the highest-pressure zone is nested within the laser-focus zone, making it difficult to differentiate the effect of the shock-wave pressure from photoinduced and plasma relaxation effect. To circumvent this difficulty, we consider two spatially separated focused beams that individually act as quasi-simultaneous pressure-wave emitters. The zone where both shock-waves interfere constructively forms a region of extreme pressure range, physically separated from the regions under direct laser exposure. Here, we present evidences of pressured-induced densification in fused silica in between the foci of the two beams, which can be exclusively attributed to the superposition of the pressure waves emitted by each focused laser-beam. Specifically, we show how the beams gap and pulses time-delay affect the structural properties of fused silica using Raman characterization, beam deflection technique, and selective etching techniques. The method is generic and can be implemented in a variety of transparent substrates for high-pressure physics studies and, unlike classical methods, such as the use of diamond anvils, offers a means to create arbitrary-shaped laser-induced high-pressure impacted zones by scanning the two beams across the specimen volume.

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Section: Modification Along the Laser Affected Zonementioning

confidence: 99%