A proposal for multi-tens of GW fully coherent femtosecond soft X-ray lasers

Abstract : X-ray free-electron lasers1, 2 delivering up to 1 × 1013 coherent photons in femtosecond pulses are bringing about a revolution in X-ray science3, 4, 5. However, some plasma-based soft X-ray lasers6 are attractive because they spontaneously emit an even higher number of photons (1 × 1015), but these are emitted in incoherent and long (hundreds of picoseconds) pulses7 as a consequence of the amplification of stochastic incoherent self-emission. Previous experimental attempts to seed such amplifiers with coherent femtosecond soft X-rays resulted in as yet unexplained weak amplification of the seed and strong amplification of incoherent spontaneous emission8. Using a time-dependent Maxwell–Bloch model describing the amplification of both coherent and incoherent soft X-rays in plasma, we explain the observed inefficiency and propose a new amplification scheme based on the seeding of stretched high harmonics using a transposition of chirped pulse amplification to soft X-rays. This scheme is able to deliver 5 × 1014 fully coherent soft X-ray photons in 200 fs pulses and with a peak power of 20 GW.
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https://hal.archives-ouvertes.fr/hal-01164099
Contributor : Victor Malka <>
Submitted on : Tuesday, June 16, 2015 - 11:05:09 AM
Last modification on : Friday, October 4, 2019 - 1:12:08 AM

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E. Oliva, M. Fajardo, L. Li, M. Pittman, T. T. T. Le, et al.. A proposal for multi-tens of GW fully coherent femtosecond soft X-ray lasers. Nature Photonics, Nature Publishing Group, 2012, 6 (11), pp.764-767. ⟨10.1038/nphoton.2012.246⟩. ⟨hal-01164099⟩

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