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Phys Rev Lett. 2007 Oct 5;99(14):143901. Epub 2007 Oct 1.

Bright quasi-phase-matched soft-X-ray harmonic radiation from argon ions.

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  • 1Department of Physics and Astronomy, Queens University Belfast, UK.


Selective enhancement (>10(3)) of harmonics extending to the water window (approximately 4 nm) 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-phase-matching is achieved by rapid axial intensity modulations caused by beating between the fundamental and higher-order capillary modes. Substantial pulse energies (>10 nJ per pulse per harmonic order) at wavelengths beyond the carbon K edge (approximately 4.37 nm, approximately 284 eV) up to approximately 360 eV are observed from argon ions for the first time.

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