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Attosecond synchronization of high-harmonic soft x-rays.

Y Mairesse1, A de Bohan, L J Frasinski

  • 1Commissariat à l'Energie Atomique, DRECAM/SPAM, Centre d'Etudes de Saclay, 91191 Gif-sur-Yvette, France.

Science (New York, N.Y.)
|December 4, 2003
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Summary

Researchers achieved 130 attosecond X-ray pulses by synchronizing high harmonics. Controlling electron dynamics improved pulse duration, enabling tracking of ultrafast electron processes.

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Area of Science:

  • * Ultrafast science and attosecond physics.
  • * High-intensity laser-matter interactions.

Background:

  • * Superposing high harmonics of intense laser pulses is a method for generating subfemtosecond light pulses.
  • * Simultaneous emission of harmonics is theoretically expected to yield shorter pulses with increased harmonic number.

Purpose of the Study:

  • * To investigate the synchronization of high harmonics on an attosecond timescale.
  • * To overcome limitations in achievable X-ray pulse duration.
  • * To explore methods for generating even shorter attosecond pulses.

Main Methods:

  • * Analysis of high harmonic emission from intense laser pulses.
  • * Control of underlying ultrafast electron dynamics.
  • * Characterization of attosecond X-ray pulse duration.

Main Results:

  • * High harmonics were found to be unsynchronized on an attosecond timescale, limiting pulse duration.
  • * Synchronization was significantly improved by controlling electron dynamics.
  • * Pulses of 130 attoseconds were successfully generated.

Conclusions:

  • * Controlling electron dynamics is crucial for achieving ultrashort X-ray pulses.
  • * 130 attosecond pulse duration was demonstrated, pushing the limits of attosecond science.
  • * Further reduction in pulse duration could enable real-time tracking of electron processes in matter.