Abstract
We present the first direct measurement of the time evolution of the gain of a soft x-ray laser amplifier. The measurement is based on the injection of a seed pulse, obtained by high-order harmonic generation, into an x-ray laser medium. Strong amplification occurs when the seed pulse is synchronized with the gain period. By precisely varying the delay between the x-ray laser plasma creation and the seed pulse injection, the actual temporal evolution of the soft x-ray amplifier gain is obtained with a subpicosecond resolution.
| Original language | English |
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| Article number | 173902 |
| Journal | Physical Review Letters |
| Volume | 95 |
| Issue number | 17 |
| DOIs | |
| Publication status | Published - 21 Oct 2005 |