Bright quasi-phasematched soft x-ray harmonic radiation from Argon ions

Details Bright quasi-phasematched soft x-ray harmonic radiation from Argon ions Bright quasi-phasematched soft x-ray harmonic radiation from Argon ions

2007-02-14

arxiv.org/abs/physics/0702117v1

Physics

Plasma Physics

13 pages including 4 figures

Scientific paper

10.1103/PhysRevLett.99.143901

Selective enhancement (>10^3) of harmonics extending to the water window (~4nm) generated in an argon gas filled straight bore capillary waveguide is demonstrated. This enhancement is in good agreement with modeling which indicates that multimode quasi-phasematching (MMQPM) is achieved by rapid axial intensity modulations caused by beating between the fundamental and higher order capillary modes. Substantial pulse-energies (>10nJ per pulse per harmonic order) at wavelengths beyond the carbon K-edge (~4.37nm, ~284eV) up to ~360eV are observed from argon ions for the first time.

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