Soft-x-ray harmonic comb from relativistic electron spikes

  title={Soft-x-ray harmonic comb from relativistic electron spikes},
  author={A. S. Pirozhkov and Masaki Kando and Timur Zh. Esirkepov and P. Gallegos and Hamad Ahmed and E. N. Ragozin and A. Ya. Faenov and Tatiana A Pikuz and Tetsuya Kawachi and Akito Sagisaka and James K. Koga and Mireille Coury and J. Green and P. S. Foster and Ceri M. Brenner and Brendan Dromey and Dan R. Symes and Michiyasu Mori and Keigo Kawase and Takashi Kameshima and Yuji Fukuda and Lili Chen and Izuru Daito and Koichi Ogura and Yukio Hayashi and Hideyuki Kotaki and H Kiriyama and Hajime Okada and Nobuyuki Nishimori and Takashi Imazono and Kiminori Kondo and T. Kimura and Toshiki Tajima and Hiroyuki Daido and P. P. Rajeev and Paul McKenna and Marco Borghesi and David Neely and Yoshimine Kato and Stepan Bulanov},
  journal={Physical Review Letters},
We demonstrate a new high-order harmonic generation mechanism reaching the "water window" spectral region in experiments with multiterawatt femtosecond lasers irradiating gas jets. A few hundred harmonic orders are resolved, giving mu J/sr pulses. Harmonics are collectively emitted by an oscillating electron spike formed at the joint of the boundaries of a cavity and bow wave created by a relativistically self-focusing laser in underdense plasma. The spike sharpness and stability are explained… Expand

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Soft-x-ray harmonic comb from relativistic electron spikes.
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