Journal
NATURE PHOTONICS
Volume 4, Issue 12, Pages 822-832Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nphoton.2010.256
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Funding
- National Science Foundation
- US Department of Energy (DOE)
- DOE National Nuclear Security Agency
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The frequency doubling of laser light was one of the first new phenomena observed following the invention of the laser over 50 years ago. Since then, the quest to extend nonlinear optical upconversion to ever-shorter wavelengths has been a grand challenge in laser science. Two decades of research into high-order harmonic generation has recently uncovered several feasible routes for generating bright coherent X-ray beams using small-scale femtosecond lasers. The physics of this technique combines the microscopic attosecond science of atoms driven by intense laser fields with the macroscopic extreme nonlinear optics of phase matching, thus essentially realizing a coherent, tabletop version of the Roentgen X-ray tube.
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