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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.
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Sauerbrey et al. (1995) studied this question.
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