Correlation between laser-induced damage densities of fused silica and average incubation fluences at 1064 nm in the nanosecond regime

Abstract

Correlation between laser-induced damage densities of fused silica and average incubation fluences at 1064 nm in the nanosecond regime The chronology of the physical processes involved in the nanosecond laser damage of fused silica is investigated at 1064 nm. From experiments realized with multiple longitudinal mode pulses, the correspondence between ring pattern damage morphology and the corresponding intensity profile allows the distinction of two damage phases: an incubation phase followed by a damage expansion phase that leads to the final damage diameter. It allows us to determine both the incubation and the expansion fluences. These results are compared to damage density measurements for different laser configurations, different optics, and different environments. It was found that damage densities were as high as incubation fluences were low. This approach shows a deterministic part of laser damage in nanosecond regime and contributes to reinforce the statistical results by reducing their random nature and is more able to guide the physical interpretations of laser damage experiments.Published by AIP Publishing.[http://dx

Laser damage morphology in fused silica induced by simultaneous multi-wavelength irradiation with multiple longitudinal modes

“…Compared to the single longitudinal mode (SLM) pulses, the MLM laser pulses with temporal instabilities raise many issues about LID. In reported work, it exhibits strong differences of damage density [15,16] and morphology [17] at exit surface of silica between SLM and MLM regimes. The LID by MLM pulses at 1ω exhibits a clear systematic ring pattern due to the formation of an ionization front in surrounding air, which is not seen in SLM cases [17][18][19].…”

“…Moreover, in MLM regime, damage sites initiated at 3ω do not reveal such rings [20]. In terms of damage densities, at a given fluence of 1ω laser pulse, they are lower when produced with SLM pulses than those produced by MLM pulses [15]. However, an opposite behavior is observed at 3ω [16].…”

Transverse Ultrafast Laser Inscription in Bulk Silicon

“…These negative results lead us to add a third optimization in the temporal domain. In the nanosecond regime, several studies have shown that the temporal pulse shape strongly influences the initiation [45][46][47][48][49] and the morphology [50,51] of laser-produced modifications in fused silica. Recent results showed that the temporal pulse shape is also a key parameter in femtosecond-laser-silicon interaction as perfect Gaussian temporal profile is not suitable for breakdown initiation inside silicon [26].…”

A coupled model of electromagnetic and heat on nanosecond-laser ablation of impurity-containing aluminum alloy

“…30 Silica is used in optical elements because of its antireection properties in high-power laser systems, which can improve the LIDT of the optical components. 31,32 Studies have mostly been conned to the laser parameters, including the pulse duration, 33 laser uence, 34 and wavelength, 35 as well as to the lm processing parameters including the thickness and organic groups 36 that affect the growth of the silica thin lm, such as its morphology and growth rate. However, studies have not modeled the relation between electromagnetic radiation and heat in the silicon dioxide thin lms.…”