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High energy ultrashort pulses can generate filaments during propagation, plasma channels which balance self-focusing to allow laser light propagation at a clamped diameter and intensities exceeding 10^13 W/cm^2 for many times the Rayleigh length. These filaments are attractive options for laser ablation at a distance but are limited in the total energy that can be delivered to a single point on target. In this work, temporally structuring femtosecond pulses into gigahertz bursts of spatially overlapped filaments lead to an increase in ablation. Material-interaction effects are compared between these nanosecond duration bursts of femtosecond pulses and traditional nanosecond pulses of similar total energy and duration in both aluminum and silicon targets.
Owen Thome,Martin Richardson,Haley Kerrigan, andDanielle Reyes
"Comparison of material interactions by nanosecond pulses and gigahertz bursts of filamenting femtosecond pulses", Proc. SPIE PC12939, High-Power Laser Ablation VIII, PC129391H (11 April 2024); https://doi.org/10.1117/12.3008155
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Owen Thome, Martin Richardson, Haley Kerrigan, Danielle Reyes, "Comparison of material interactions by nanosecond pulses and gigahertz bursts of filamenting femtosecond pulses," Proc. SPIE PC12939, High-Power Laser Ablation VIII, PC129391H (11 April 2024); https://doi.org/10.1117/12.3008155