期刊
CHEMICAL PHYSICS
卷 366, 期 1-3, 页码 9-14出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chemphys.2009.09.016
关键词
Attosecond pulses; High-harmonic generation; Ultrafast optics; Carrier-envelope phase
资金
- Air Force Office of Scientific Research [FA9550-04-1-0242]
- US Department of Energy [DE-AC02-05CH11231]
- Alexander von Humboldt-Foundation
- National Science Foundation Chemistry grant
- Morris Belkin Visiting Professorship at the Weizmann Institute of Science
- Direct For Mathematical & Physical Scien [0742662] Funding Source: National Science Foundation
- Division Of Chemistry [0742662] Funding Source: National Science Foundation
Combining results from several techniques of attosecond spectroscopy, we show that ionization gating of high-harmonic emission on the leading edge of the driving pulse produces isolated attosecond pulses with a contrast ratio (the energy in the main pulse normalized to the energy in adjacent satellite pulses) c = 3.3 +/- 0: 2. Half-cycle cutoff analysis confirms that harmonic generation proceeds in the ionization-gated regime. The attosecond pulse contrast is measured using the technique of carrier-envelope phase (CEP)-scanning, recently developed by our group, in which photoelectrons generated from Ne atoms by the harmonic pulse are streaked as a function of CEP. Streaking of photoelectrons as a function of attosecond time delay also confirms the isolated nature of the harmonic pulse, which is measured to have a duration of 430 +/- 15 as, limited by the bandwidth of the reflective X-ray optics employed. The combined measurements imply that the experimental advantages of the ionization gating technique-tunable X-ray emission, relaxed sensitivity to the CEP and scalability to longer driver pulses-are also conferred on isolated attosecond pulse production. Published by Elsevier B.V.
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