期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 106, 期 26, 页码 10558-10563出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0904912106
关键词
attosecond imaging; ultrafast techniques
资金
- National Science Foundation
- Air Force Office of Scientific Research in the Gordon
- Betty Moore Center for Physical Biology at Caltech
Here, we describe the temporal lens'' concept that can be used for the focus and magnification of ultrashort electron packets in the time domain. The temporal lenses are created by appropriately synthesizing optical pulses that interact with electrons through the ponderomotive force. With such an arrangement, a temporal lens equation with a form identical to that of conventional light optics is derived. The analog of ray diagrams, but for electrons, are constructed to help the visualization of the process of compressing electron packets. It is shown that such temporal lenses not only compensate for electron pulse broadening due to velocity dispersion but also allow compression of the packets to durations much shorter than their initial widths. With these capabilities, ultrafast electron diffraction and microscopy can be extended to new domains, and, just as importantly, electron pulses can be delivered directly on an ultrafast techniques target specimen.
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