Extended phase matching of high harmonics driven by mid-infrared light

Tenio Popmintchev*, Ming Chang Chen, Oren Cohen, Michael E. Grisham, Jorge J. Rocca, Margaret M. Murnane, Henry C. Kapteyn

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

174 Scopus citations


We demonstrate that phase-matched frequency upconversion of ultrafast laser light can be extended to shorter wavelengths by using longer driving laser wavelengths. Experimentally, we show that the phasematching cutoff for harmonic generation in argon increases from 45 to 100 eV when the driving laser wavelength is increased from 0.8 to 1.3 μm. Phase matching is also obtained at higher pressures using a longer-wavelength driving laser, mitigating the unfavorable scaling of the single-atom response. Theoretical calculations suggest that phase-matched high harmonic frequency upconversion driven by mid-infrared pulses could be extended to extremely high photon energies.

Original languageEnglish
Pages (from-to)2128-2130
Number of pages3
JournalOptics Letters
Issue number18
StatePublished - 15 Sep 2008
Externally publishedYes


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