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Phys Rev Lett. 2007 Aug 3;99(5):053902. Epub 2007 Jul 31.

Grating-assisted phase matching in extreme nonlinear optics.

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  • 1Department of Physics and JILA, University of Colorado at Boulder and NIST, Boulder, Colorado 80309, USA.


We propose a new technique for phase matching high harmonic generation that can be used for generating bright, tabletop, tunable, and coherent x-ray sources at keV photon energies. A weak quasi-cw counterpropagating field induces a sinusoidal modulation in the phase of the emitted harmonics that can be used for correcting the large plasma-induced phase mismatch. We develop an analytical model that describes this grating-assisted x-ray phase matching and predicts that very modest intensities (<10(10) W/cm2) of quasi-cw counterpropagating fields are required for implementation.

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