期刊
NATURE PHOTONICS
卷 6, 期 5, 页码 304-307出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHOTON.2012.76
关键词
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资金
- LDRD at the Los Alamos National Laboratory [20110341ER]
- Munich Center for Advanced Photonics
- Association EURATOM-Max-Planck-Institute for Plasma Physics
Half-cycle picosecond pulses have been produced from thin photoconductors when applying an electric field across the surface and switching on conduction using a short laser pulse. The transverse current in the wafer plane then emits half-cycle pulses in a normal direction, and pulses of 500 fs duration and 1 x 10(6) Vm(-1) peak electric field have been observed. Here, we show that single half-cycle pulses with a duration of 50 as and up to 1 x 10(13) Vm(-1) can be produced when irradiating a double foil target with intense few-cycle laser pulses. Focused onto an ultrathin foil, all electrons are blown out, forming a uniform sheet of relativistic electrons. A second layer, placed some distance behind, reflects the drive beam but lets electrons pass straight through. Under oblique incidence, beam reflection provides the transverse current, which emits intense half-cycle pulses. Such a pulse may completely ionize even heavier atoms. With these developments, new types of attosecond pump-probe experiments will become possible.
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