Journal
PHYSICAL REVIEW A
Volume 79, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.79.063829
Keywords
argon; atom-photon collisions; laser beams; optical harmonic generation; optical phase matching
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Funding
- European Union [012843-2]
- Marie Curie actions EST MAXLAS
- IIF OHIO
- EIF Attotech
- Knut and Alice Wallenberg Foundation
- Swedish Science Council
- U.S. National Science Foundation [PHY-044923]
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We characterize and control the harmonic emission in the spectral and spatial domains in order to define in which conditions the harmonic radiation can be a high-quality seed for soft x-ray and x-ray free-electron lasers. The length of the gas cell, where harmonics are generated, was optimized and the energy per pulse was determined in absolute value with a calibrated x-ray photodiode. The beam spatial profile was measured and, in some conditions, a very collimated beam with a half-angle divergence below 1 mrad could be obtained. We also show that increasing the intensity of the fundamental laser field leads to a considerable broadening of the bandwidth of the harmonic radiation, allowing us to cover a large spectral range. This effect is due to fundamental reshaping leading to an efficient phase matching of both short- and long-trajectory contributions.
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