Journal
OPTICS LETTERS
Volume 33, Issue 18, Pages 2128-2130Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.33.002128
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Funding
- National Science Foundation (NSF) Engineering Research Center for Extreme Ultraviolet Science and Technology [0310717]
- U.S. Department of Energy
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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 phase-matching 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 mu m. 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. (c) 2008 Optical Society of America
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