期刊
NATURE PHOTONICS
卷 8, 期 6, 页码 437-441出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/nphoton.2014.83
关键词
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资金
- Defense Advanced Research Projects Agency (DARPA) program in ultrafast laser science and engineering (PULSE) programme through a grant from Aviation and Missile Research, Development, and Engineering Center (AMRDEC)
- US Army Research Office [W911 NF-12-1-0456]
- National Science Foundation [106860]
- US Department of Energy
- National Science Council of Taiwan
- National Taiwan University [103R104021, 103R8700-2]
- Division Of Physics
- Direct For Mathematical & Physical Scien [1068604] Funding Source: National Science Foundation
The generation of high-order harmonics(1) and attosecond pulses(2) at ultrahigh repetition rates (> 1 MHz) promises to revolutionize ultrafast spectroscopy. Such vacuum ultraviolet (VUV) and soft X-ray sources could potentially be driven directly by plasmonic enhancement of laser pulses from a femtosecond oscillator(3,4), but recent experiments suggest that the VUV signal is actually dominated by incoherent atomic line emission(5,6). Here, we demonstrate a new regime of phase-matched below-threshold harmonic generation, for which the generation and phase matching is enabled only near resonance structures of the atomic target. The coherent VUV line emission exhibits low divergence and quadratic growth with increasing target density up to nearly 1,000 torr mm and can be controlled by the sub-cycle field of a few-cycle driving laser with an intensity of only similar to 1x10(13) Wcm(-2), which is achievable directly from few-cycle femtosecond oscillators with nanojoule energy(7).
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