Abstract
Propagation effects in the high-order harmonic generation of high-intensity subpicosecond KrF laser radiation (6 × 10 15 W/cm 2) in carbon vapor and low charged carbon plasma are studied. An anomalous behaviour of the fifth harmonic is observed. The continuous growth of its intensity with the plasma length is explained by defocusing of laser radiation and noncollinear phase-matched difference-frequency mixing.
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