Abstract
We build a frequency resolved optical gating (FROG) setup based on the second harmonic
generation (SHG) FROG to characterize the mid-infrared (MIR) few-cycle laser pulse in single shot
basis. Considering the extremely wide bandwidth, we use 20-µm-thick BBO crystal as the nonlinear
medium, and correct the spectral response with the frequency summing efficiency. Spatial splitting
is adopted to avoid additional material dispersion. In combination with a 4f imaging, this
configuration enables the setup to run in single shot. With the central wavelength of 1.8 µm, the
measured pulse has a duration of 9.3 fs, which corresponds to about 1.5 cycles.
© 2012 Chinese Optics Letters
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