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DC Photoelectron Gun Parameters for Ultrafast Electron Microscopy

Published online by Cambridge University Press:  03 July 2009

Joel A. Berger ,
John T. Hogan ,
Michael J. Greco ,
W. Andreas Schroeder ,
Alan W. Nicholls  and
Nigel D. Browning
Joel A. Berger
Affiliation:
Department of Physics (M/C 273), University of Illinois at Chicago, 845 W. Taylor Street, Chicago, IL 60607-7059, USA
John T. Hogan
Affiliation:
Department of Physics (M/C 273), University of Illinois at Chicago, 845 W. Taylor Street, Chicago, IL 60607-7059, USA
Michael J. Greco
Affiliation:
Department of Physics (M/C 273), University of Illinois at Chicago, 845 W. Taylor Street, Chicago, IL 60607-7059, USA
W. Andreas Schroeder*
Affiliation:
Department of Physics (M/C 273), University of Illinois at Chicago, 845 W. Taylor Street, Chicago, IL 60607-7059, USA
Alan W. Nicholls
Affiliation:
Research Resources Center - East (M/C 337), University of Illinois at Chicago, 845 W. Taylor Street, Chicago, IL 60607-7058, USA
Nigel D. Browning
Affiliation:
Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA 94550, USA Department of Chemical Engineering and Materials Science, University of California, One Shields Avenue, Davis, CA 95616, USA
*
Corresponding author. E-mail: andreas@uic.edu
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Abstract

We present a characterization of the performance of an ultrashort laser pulse driven DC photoelectron gun based on the thermionic emission gun design of Togawa et al. [Togawa, K., Shintake, T., Inagaki, T., Onoe, K. & Tanaka, T. (2007). Phys Rev Spec Top-AC10, 020703]. The gun design intrinsically provides adequate optical access and accommodates the generation of ∼1 mm2 electron beams while contributing negligible divergent effects at the anode aperture. Both single-photon (with up to 20,000 electrons/pulse) and two-photon photoemission are observed from Ta and Cu(100) photocathodes driven by the harmonics (∼4 ps pulses at 261 nm and ∼200 fs pulses at 532 nm, respectively) of a high-power femtosecond Yb:KGW laser. The results, including the dependence of the photoemission efficiency on the polarization state of the drive laser radiation, are consistent with expectations. The implications of these observations and other physical limitations for the development of a dynamic transmission electron microscope with sub-1 nm·ps space-time resolution are discussed.

Keywords

ultrafastelectron microscopyphotoemissionemittance
Type
Special Section: Ultrafast Electron Microscopy
Information
Microscopy and Microanalysis , Volume 15 , Issue 4 , August 2009 , pp. 298 - 313
Copyright
Copyright © Microscopy Society of America 2009

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References

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