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17 February 2011Autocorrelation of femtosecond VUV pulses using multiphoton ionization
We have developed an autocorrelator utilizing multiphoton ionization of rare gases as a nonlinear medium to evaluate
the pulse width of a femtosecond Ti:Sapphire laser at 882 nm. The autocorrelation width of 171 fs (FWHM) was
evaluated by the autocorrelator utilizing nine-photon ionization of Ar. By using the ninth-order correlation factor of 1.06,
the actual pulse width of 161 fs (FWHM) was determined, which was consistent to that of 165 fs (FWHM) measured
with a two-photon autocorrelator. The autocorrelation measurement utilizing the multiphoton ionization of Ar should be
applied to vacuum ultraviolet (VUV) ultrashort pulses at 126 nm, since neutral Ar atoms will be ionized by two-photon
absorption. This method has a potential to become a versatile autocorrelator that characterizes femtosecond laser pulse
widths in the wide spectral range between IR and VUV.
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Masanori Kaku, Wataru Nagaya, Hironari Zushi, Masahito Katto, Shoichi Kubodera, "Autocorrelation of femtosecond VUV pulses using multiphoton ionization," Proc. SPIE 7915, High Energy/Average Power Lasers and Intense Beam Applications V, 79150G (17 February 2011);