Three techniques are demonstrated for measuring femtosecond pulses from the deep vacuum ultraviolet to the visible based on the ionization dynamics of optical-field-ionized plasmas. A probe pulse propagates through a plasma generated by an intense femtosecond KrF excimer laser pump pulse. Ionization-induced defocussing or collisional absorption yield a cross-correlation measurement of the probe pulse. Ionization-induced spectral blue shifting of the probe can give an upper limit for the probe pulse duration.
© 1995 Optical Society of America
S. P. Le Blanc, Z. Qi, and R. Sauerbrey, "Femtosecond vacuum-ultraviolet pulse measurement by field-ionization dynamics," Opt. Lett. 20, 312-314 (1995)