High-order harmonic generation by subpicosecond KrF excimer laser pulses.
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 (N(2), O(2)). The highest-order harmonic, 7.1 nm, the 35th, was observed in He and Ne, and 8.6 nm, the 29th, in N(2) and O(2). 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.
Y
Y
Nagata
K
K
Midorikawa
M
M
Obara
K
K
Toyoda