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Phys Rev Lett. 2015 Aug 21;115(8):083901. doi: 10.1103/PhysRevLett.115.083901. Epub 2015 Aug 19.

Demonstration of a Circularly Polarized Plasma-Based Soft-X-Ray Laser.

Physical review letters

A Depresseux, E Oliva, J Gautier, F Tissandier, G Lambert, B Vodungbo, J-P Goddet, A Tafzi, J Nejdl, M Kozlova, G Maynard, H T Kim, K Ta Phuoc, A Rousse, P Zeitoun, S Sebban

Affiliations

  1. Laboratoire d'Optique Appliquée, ENSTA ParisTech, CNRS, École Polytechnique, Université Paris-Saclay, 828 boulevard des Maréchaux, 91762 Palaiseau, France.
  2. Laboratoire de Physique des Gaz et des Plasmas, CNRS Université Paris-Sud 11, 91405, Orsay, France.
  3. ELI Beamlines Project, Institute of Physics of the ASCR, Na Slovance 2, 182 21 Prague 8, Czech Republic.
  4. Advanced Photonics Research Institute, GIST, Gwangju 500-712, Korea.
  5. Center for Relativistic Laser Science, Institute for Basic Science (IBS), Gwangju 500-712, Korea.

PMID: 26340189 DOI: 10.1103/PhysRevLett.115.083901

Abstract

We report the first experimental demonstration of a laser-driven circularly polarized soft-x-ray laser chain. It has been achieved by seeding a 32.8 nm Kr ix plasma amplifier with a high-order harmonic beam, which has been circularly polarized using a four-reflector polarizer. Our measurements testify that the amplified radiation maintains the initial polarization of the seed pulse in good agreement with our Maxwell-Bloch modeling. The resulting fully circular soft-x-ray laser beam exhibits a Gaussian profile and yields about 10^{10} photons per shot, fulfilling the requirements for laboratory-scale photon-demanding application experiments.

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