Femtosecond high-intensity laser-plasma harmonics, using practical double-plasma-mirror pulse cleaner

Physics – Plasma Physics

Scientific paper

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Scientific paper

We describe high-contrast laser-plasma harmonic generation from 50fs pulses at intensities of a few times 10^19 W cm-2, using a practical double plasma-mirror built into a f=10m null telescope. The plasma mirrors are situated near the far-field at the middle of the telescope, and can be configured to optimize the reflection efficiency and pulse contrast. The final focal spot contains more than 50% of the original pulse energy, is highly reproducible and nearly diffraction-limited. The pulse's leading edge is steepened and pulse contrast better than 10^10 is obtained. The harmonics produced contain regular fine structure which do not appear to originate in any preformed plasma.

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