Attosecond synchronization of high-harmonic soft x-rays.

  title={Attosecond synchronization of high-harmonic soft x-rays.},
  author={Yann Mairesse and Armelle de Bohan and Leszek J. Frasinski and Hamed Merdji and Laura Dinu and P. Monchicourt and Pierre Breger and M Kovacev and R Ta{\"i}eb and Bertrand Carr{\'e} and H. G. Muller and Pierre Agostini and Pascal Sali{\`e}res},
  volume={302 5650},
Subfemtosecond light pulses can be obtained by superposing several high harmonics of an intense laser pulse. Provided that the harmonics are emitted simultaneously, increasing their number should result in shorter pulses. However, we found that the high harmonics were not synchronized on an attosecond time scale, thus setting a lower limit to the achievable x-ray pulse duration. We showed that the synchronization could be improved considerably by controlling the underlying ultrafast electron… CONTINUE READING