Parametric study of the growth of damage sites on the rear surface of fused silica windows

Raze, Gerard; Morchain, Jean-Marie; Loiseau, Marc; Lamaignère, Laurent; Josse, Michel A.; Bercegol, Herve

doi:10.1117/12.472435

Cited by 30 publications

(14 citation statements)

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“…Bold squares are very close to this line, meaning that the growth behavior can be described in average by a unique value at a given fluence. A growth threshold around 5 J/cm 2 is deduced from this experiment; it corresponds to the threshold previously reported by several authors [4][5][6][7][8][9][10][11][12][13][14][15][16]. Shot after shot, damage sites are bigger and bigger, but for a given laser energy deposition, the stresses developed by the pressure pulse remain equal for longer circumferential and radial cracks that are more numerous too.…”

Section: Resultsmentioning

confidence: 88%

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Damage growth in fused silica optics at 351 nm: refined modeling of large-beam experiments

et al. 2013

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Up to now, laser damage growth on the exit surface of fused silica optics has been mainly considered as exponential, the growth coefficient depending essentially on fluence. From experiments with large beams carried out at 351 nm under nanosecond pulses, a statistical analysis is conducted leading to a refined representation of the growth. The effect of several parameters has been taken into account to describe precisely the growth phenomenon. The two principal parameters proved to be the mean fluence and the size of the damage sites. Nevertheless, contributions of other parameters have been estimated too: the number of neighbors around the damage site, the shot number, etc. From experimental results, a model smoothed on a statistical approach is developed that permits the description of a complete sequence of growth. To evaluate the relevance of the modeling approach, the occluded area estimated from modeling is compared with the ones experimentally measured. For this purpose, numerical growth methods have been developed too. It is shown that the approach outlined is appropriate for a more precise description of the growth.

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Section: Resultsmentioning

confidence: 88%

“…Values of the coefficient C are reported in the insert for each size bin. The dashed line is the standard behavior from literature [4][5][6][7][8][9][10][11][12][13][14][15][16] Refined modeling of large-beam experiments 523…”

Section: Multiparameter Modelmentioning

confidence: 99%

Damage growth in fused silica optics at 351 nm: refined modeling of large-beam experiments

et al. 2013

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“…Thus, the effect of the beam size is of main concern. In the nanosecond regime, similar behavior in growth with small and large beams has been observed [20]. To investigate this field in the short pulse regime, a setup using a larger beam with a square top-hat spatial profile is under development.…”

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confidence: 99%

Laser damage growth with picosecond pulses

et al. 2016

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“…This is due to the fact that damage initiation can lead to catastrophic failure of the material due to the growth of the original damage site(s) with subsequent exposure to a relatively small number of laser pulses. Damage initiation sites are typically on the order of 10 µm in diameter, depending on the laser pulse length, but tend to grow exponentially under subsequent ns laser irradiation [1][2][3][4][5][6]. Microscopic examination of these sites reveals the formation of a damage crater containing modified material believed to be the result of exposure to high pressures and/or temperatures, as well as cleaved surfaces and cracks [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Imaging the early material response associated with exit surface damage in fused silica

2010

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The processes involved at the onset of damage initiation on the surface of fused silica have been a topic of extensive discussion and thought for more than four decades. Limited experimental results have helped develop models covering specific aspects of the process. In this work we present the results of an experimental study aiming at imaging the material response from the onset of the observation of material modification during exposure to the laser pulse through the time point at which material ejection begins. The system involves damage initiation using a 355 nm pulse, 7.8 ns FWHM in duration and imaging of the affected material volume with spatial resolution on the order of 1 µm using as strobe light a 150 ps laser pulse that is appropriately timed with respect to the pump pulse. The observations reveal that the onset of material modification is associated with regions of increased absorption, i.e., formation of an electronic excitation, leading to a reduction in the probe transmission to only a few percent within a time interval of about 1 ns. This area is subsequently rapidly expanding with a speed of about 1.2 µm/ns and is accompanied by the formation and propagation of radial cracks. These cracks appear to initiate about 2 ns after the start of the expansion of the modified region. The damage sites continue to grow for about 25 ns but the mechanism of expansion after the termination of the laser pulse is via formation and propagation of lateral cracks. During this time, the affected area of the surface appears to expand forming a bulge of about 40 µm in height. The first clear observation of material cluster ejection is noted at about 50 ns delay.

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Parametric study of the growth of damage sites on the rear surface of fused silica windows

Cited by 30 publications

References 0 publications

Damage growth in fused silica optics at 351 nm: refined modeling of large-beam experiments

Damage growth in fused silica optics at 351 nm: refined modeling of large-beam experiments

Laser damage growth with picosecond pulses

Imaging the early material response associated with exit surface damage in fused silica

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