Article

Four-dimensional investigation of the 2nd order volume autocorrelation technique

University of Crete Department of Physics P.O. Box 2208 71003 Heraklion, Crete Greece
Applied Physics B (Impact Factor: 1.78). 01/2009; 97(2):505-510. DOI: 10.1007/s00340-009-3559-z

ABSTRACT The 2nd order volume autocorrelation technique, widely utilized in directly measuring ultra-short light pulses durations,
is examined in detail via model calculations that include three-dimensional integration over a large ionization volume, temporal
delay and spatial displacement of the two beams of the autocorrelator at the focus. The effects of the inherent displacement
to the 2nd order autocorrelation technique are demonstrated for short and long pulses, elucidating the appropriate implementation
of the technique in tight focusing conditions. Based on the above investigations, ahigh accuracy 2nd order volume autocorrelation
measurement of the duration of the 5th harmonic of a 50fs long laser pulse, including the measurement of the carrier wavelength
oscillation, is presented.

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