20 September 2004 Measurements of laser impulse coupling at 130 fs
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Proceedings Volume 5448, High-Power Laser Ablation V; (2004) https://doi.org/10.1117/12.568419
Event: High-Power Laser Ablation, 2004, Taos, New Mexico, United States
Abstract
For the first time, we have measured the momentum coupling coefficient and plasma expansion velocity (specific impulse) in the femtosecond region, over a laser intensity range from ablation threshold to thirty times threshold. These measurements extend the laser pulsewidth three orders of magnitude relative to previous reports. We studied several pure metals and three organic compounds as targets. The organic compounds were exothermic polymers specifically developed for the micro-laser plasma thruster, and two of these used "tuned absorbers" rather than carbon particles for the laser absorption function. The metals ranged from Li to W in atomic weight. We measured time of flight profiles for ions and found dramatic two-temperature distributions for some conditions. Specific impulse reached record values for this type of measurement and ablation efficiency was near 100%.
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Claude R. Phipps, James R. Luke, David J. Funk, David S. Moore, J. Glownia, Thomas Lippert, "Measurements of laser impulse coupling at 130 fs", Proc. SPIE 5448, High-Power Laser Ablation V, (20 September 2004); doi: 10.1117/12.568419; https://doi.org/10.1117/12.568419
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