摘要
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.
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.
基金
supported by the National Natural Science Foundation of China (Nos. 10734080, 60921004,60908008, and 61078037)
the National Basic Research Program of China (No. 2011CB808101)
