The realization of a first-order interferometric autocorrelator in a nearly collinear geometry is reported as an
alternative method to measure the minimum pulse duration of femtosecond deep-UV laser pulses. The Fourier
limited duration of 257-nm femtosecond pulses is measured with high accuracy, and compared to what obtained by
spectrally measuring the bandwidth of the pulses. The agreement between the two methods is excellent, thus
indicating the interferometric autocorrelator as a useful tool to extract the chirp of femtosecond UV pulses when
used together with a second-order autocorrelator to measure the actual pulse duration.
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