Relic Crystal-Lattice Effects on Raman Compression of Powerful X-Ray Pulses in Plasmas

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V. M. Malkin and N. J. Fisch
Department of Astrophysical Sciences, Princeton University, Princeton, New Jersey 08544, USA

Received 8 May 2007; published 12 November 2007

Powerfulx-ray pulses might be compressed to even greater powers bymeans of backward Raman amplification in ultradense plasmas produced byionizing condensed matter by the same pulses. The pulse durationscontemplated are shorter than the time for complete smoothing ofthe crystal lattice by thermal motion of ions. Although inhomogeneitiesare generally thought to be deleterious to the Raman amplification,the relic lattice might, in fact, be useful for theRaman amplification. The x-ray frequency band gaps can suppress parasiticRaman scattering of amplified pulses, while enhanced dispersion of thex-ray group velocity near the gaps can delay self-phase-modulation instability,thereby enabling further amplification of the x rays.

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.99.205001
DOI:	10.1103/PhysRevLett.99.205001
PACS:	52.38.-r; 41.60.Cr; 42.55.Vc; 42.65.Re 52.38.-r Laser–plasma interactions 41.60.Cr Free-electron lasers 42.55.Vc X- and -ray lasers 42.65.Re Ultrafast processes; optical pulse generation and pulse compression YEAR: 2007

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