Abstract

A femtosecond broadband extreme-ultraviolet quasi-continuum was generated by an intense femtosecond Ti:sapphire laser by two nonlinear optical processes. The first process is the generation of the broadband harmonics by focusing the blueshifted laser pulse through a rare gas. The spectral blueshift is caused by self-phase modulation owing to ionization of the target gas. The second process is the generation of broadband even-order harmonics by the superposition of the second-harmonic electric field upon the fundamental.

© 1998 Optical Society of America

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