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The production of coherent soft x-rays via high harmonic generation (HHG) from Ar, N 2 and N 2 O in a gas-filled capillary waveguide is reported. Odd harmonics of the driving laser intensity are observed as a function of gas pressure up to energies of 50 eV. By employing a simple phase matching theory that incorporates the spatial and temporal dependences of ionization within the waveguide, good agreement with the HHG spectral envelope has been obtained, indicating phase matching is the dominant factor in shaping the spectral envelope of the harmonics.
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Stebbings et al. (2008) studied this question.
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