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Review of Scientific Instruments / Volume 82 / Issue 12 / ARTICLES / Optics; Atoms and Molecules; Spectroscopy; Photon Detectors

Rev. Sci. Instrum. 82, 123105 (2011); http://dx.doi.org/10.1063/1.3665926 (9 pages)

Apparatus for laser-assisted electron scattering in femtosecond intense laser fields

Reika Kanya, Yuya Morimoto, and Kaoru Yamanouchi

Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

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(Received 2 October 2011; accepted 15 November 2011; published online 13 December 2011)

An apparatus for observation of laser-assisted electron scattering (LAES) in femtosecond intense laser fields was developed. The unique apparatus has three essential components, i.e., a photocathode-type ultrashort pulsed-electron gun, a toroidal-type electron energy analyzer enabling simultaneous detection of energy and angular distributions of scattered electrons with high efficiency, and a high repetition-rate data acquisition system combined with a high power 5 kHz Ti:sapphire laser system. These advantages make extremely weak femtosecond-LAES signals distinguishable from the huge elastic scattering signals. A precise method for securing a spatial overlap between three beams, that is, an atomic beam, an electron beam, and a laser beam, and synchronization between the electron and laser pulses is described. As a demonstration of this apparatus, an electron energy spectrum of the LAES signals with 1.4 × 1012 W/cm2, 795 nm, 50 fs laser pulses was observed, and the detection limit and further improvements of the apparatus are examined.

© 2011 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. APPARATUS
    1. Laser beam
    2. Sample gas beam
    3. Electron beam
    4. Electron energy analyzer and detector
  3. SUPPRESSION OF BACKGROUND NOISES
  4. SPATIOTEMPORAL OVERLAP BETWEEN THE THREE BEAMS
    1. Spatial overlap by laser and electron shadow graphs
    2. Temporal overlap by electron shadow graph
  5. DETECTION LIMIT AND FURTHER IMPROVEMENTS
  6. CONCLUSION

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KEYWORDS and PACS

Keywords

atom-electron collisions, data acquisition, electron guns, high-speed optical techniques, photocathodes

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3665926

PUBLICATION DATA

ISSN

0034-6748 (print)  
1089-7623 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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