Research Papers in Physics and Astronomy


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Published by American Physical Society. Physical Review Letters 75, 2324 (1995). Copyright © 1995 American Physical Society. Permission to use.


Using temporally and spectrally resolved diagnostics, we show that the pulse duration of laser-produced soft x rays emitted from solid targets can be controlled, permitting a reduction to as short as a few picoseconds. To enable this control, only a single parameter must be adjusted, namely, the intensity of the high-contrast ultrashort laser pulse (400 fs). These results are found to be in qualitative agreement with a simple model of radiation from a collisionally dominated atomic system.

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