Abstract

We investigated the generation of high-order harmonics of a KrF excimer laser (80 mJ, 0.5 ps) in rare gases (He, Ne) and molecular gases (N2, O2). The highest-order harmonic, 7.1 nm, the 35th, was observed in He and Ne, and 8.6 nm, the 29th, in N2 and O2. Our experimental results suggest that the high-order harmonics are emitted from ionized atoms. The maximum photon energy of the high-order harmonics may be restricted by phase mismatching caused by free electrons.

© 1996 Optical Society of America

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