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 AmericaFull Article | PDF Article
M. E. Faldon, M. H. R. Hutchinson, J. P. Marangos, J. E. Muffett, R. A. Smith, J. W. G. Tisch, and C. G. Wahlstrom
J. Opt. Soc. Am. B 9(11) 2094-2099 (1992)
S. P. Le Blanc, R. Sauerbrey, S. C. Rae, and K. Burnett
J. Opt. Soc. Am. B 10(10) 1801-1809 (1993)
J. K. Crane, R. W. Falcone, M. D. Perry, and S. Herman
Opt. Lett. 17(18) 1256-1258 (1992)