Shortcut for X-ray pulses

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Abstract
The quest for ever-shorter laser pulses inevitably results in each pulse containing fewer and fewer oscillations of the laser field. Indeed, the shortest visible and infrared laser pulses are typically just a few femtoseconds (1015 seconds) in duration and contain only a few cycles of the laser field. However, there is a need for even shorter pulses to study fundamental physical, chemical and biological processes on shorter and shorter timescales. Moreover, many applications require photons with higher energies, so there is a corresponding need for ultrashort pulses at shorter wavelengths in the extreme ultraviolet and X-ray regions of the spectrum. Ferenc Krausz of the Technical University of Vienna and co-workers in Germany and Canada have now taken a major step in this direction (M Drescher et al. 2001 Science at press).

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