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A Novel Femtosecond-gated, High-resolution, Frequency-shifted Shearing Interferometry Technique for Probing Pre-plasma Expansion in Ultra-intense Laser Experiments
MICHIGAN UNIV ANN ARBOR
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Ultra-intense laser-matter interaction experiments greater than 1018 Wcm2 with dense targets are highly sensitive to the effect of laser noise in the form of pre-pulses preceding the main ultra-intense pulse. These system-dependent pre-pulses in the nanosecond andor picosecond regimes are often intense enough to modify the target significantly by ionizing and forming a plasma layer in front of the target before the arrival of the main pulse. Time resolved interferometry offers a robust way to characterize the expanding plasma during this period. We have developed a novel pump-probe interferometry system for an ultra-intense laser experiment that uses two short-pulse amplifiers synchronized by one ultra-fast seed oscillator to achieve 40-fs time resolution over hundreds of nanoseconds, using a variable delay line and other techniques.
APPROVED FOR PUBLIC RELEASE