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APS » Journals » Phys. Rev. Lett. » Volume 99 » Issue 14
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Phys. Rev. Lett. 99, 143901 (2007) [4 pages]

Bright Quasi-Phase-Matched Soft-X-Ray Harmonic Radiation from Argon Ions

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M. Zepf1,*, B. Dromey1, M. Landreman2, P. Foster3, and S. M. Hooker2
1Department of Physics and Astronomy, Queens University Belfast, BT7 1NN, United Kingdom
2Clarendon Laboratory, Oxford University, OX1 3PU, United Kingdom
3Central Laser Facility, CCLRC Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, United Kindgom

Received 15 February 2007; published 1 October 2007

Selective enhancement (>103) of harmonics extending to the water window (∼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 (∼4.37  nm, ∼284  eV) up to ∼360  eV are observed from argon ions for the first time.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.143901
DOI:
10.1103/PhysRevLett.99.143901
PACS:
42.65.Ky, 32.80.Wr, 52.35.Mw

*m.zepf@qub. ac. uk

 
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