Grating-assisted phase matching in extreme nonlinear optics

Oren Cohen*, Xiaoshi Zhang, Amy L. Lytle, Tenio Popmintchev, Margaret M. Murnane, Henry C. Kapteyn

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

60 Scopus citations


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 (<1010W/cm2) of quasi-cw counterpropagating fields are required for implementation.

Original languageEnglish
Article number053902
JournalPhysical Review Letters
Issue number5
StatePublished - 31 Jul 2007
Externally publishedYes


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