  We experimentally demonstrate an efficient broadband second harmonic
generation process with tunable mode-locked Ti: sapphire oscillator. We have
achieved a robust broadband and efficient flat conversion of more than 35nm
wavelength, by designing an adiabatic aperiodically poled potassium titanyl
phosphate (KTP) crystal. Moreover, we have shown that with such efficient flat
conversion, we can shape and control broadband second harmonic pulses. More
specifically, we assign spectral-phase of abs-value and {\pi}-step, which
allows wavelength tunable intense pump-probe and amplitude modulation of the
broadband second harmonic output. Such spectral phases serve as a proof of
concept for other pulse-shaping application for nonlinear spectroscopy and
imaging.
