Ultrahigh nonlinear harmonics in gases

Summary form only given. The subpicosecond laser pulse is focused into a pulsed gas jet which has an atomic density of about 10/sup 17/ cm/sup -3/ in the interaction region. The VUV light generated in the nonlinear interaction with the atomic medium is analyzed along the laser axis by using a grating monochromator. The harmonic spectrum has a characteristic universal shape.<
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