Abstract
The temporal profile and phase of the fifth harmonic of a Ti:sapphire laser were fully characterized by two-photon ionization (TPI) frequency-resolved optical gating (FROG) technique for the first time. The fifth harmonic was found to have negative chirp and the pulse compression was demonstrated. The negative chirp is well explained by using a zero-range potential model. TPI FROG is scalable to XUV and soft x-ray regions by using currently available light sources, making it possible to measure the pulse duration and phase of VUV, XUV, and soft x-ray pulses.
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