Pulse contrast enhancement of high-energy pulses by use of a gas-filled hollow waveguide.

@article{Homoelle2002PulseCE,
  title={Pulse contrast enhancement of high-energy pulses by use of a gas-filled hollow waveguide.},
  author={Doug Christopher Homoelle and Alexander L Gaeta and Victor P. Yanovsky and Gerard Albert Mourou},
  journal={Optics letters},
  year={2002},
  volume={27 18},
  pages={
          1646-8
        }
}
Using nonlinear ellipse rotation in a gas-filled hollow waveguide, we have increased the pulse contrast of a microjoule femtosecond laser pulse by several orders of magnitude. This scheme offers a number of advantages over competing techniques, including a high degree of tunability that allows for a broad range of input pulse parameters, higher throughput, greater stability, and an output pulse with high spatial quality that is compressible to a quarter of the original temporal width. 
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