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Abstract
Optimization of high-order harmonic generation has been studied with a 30 fs laser at an intensity of < 2x10 14 W/cm 2 in a quasi-static gas cell (≤ 10 mm) filled with argon (≤ 90 torr). The effect of propagation length and gas density on the conversion efficiency and spatial quality of high-order harmonics are investigated comprehensively. As a result of phase-matched propagation, both the spatial quality and conversion efficiency of the 29th harmonic are successfully optimized to Gaussian-like profile with a divergence of 4.5 mrad (full width at 1/e 2 maximum) and a saturated efficiency. A quasi-two-dimensional simulation confirms the phase-matching effect.
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