Active synchronization of two independent femtosecond and picosecond lasers and sum frequency generation of two laser pulses

The scheme for synchronizing Ti: sapphire femtosecond laser and Nd: YVO₄ picosecond laser is described. Sub-ps jitter is obtained, based on which broad-band femtosecond blue-light laser of 460 nm is generated through mixing two laser pulses in the BBO crystal. The technique not only shows a general way of synchronizing lasers of completely different wavelengths and pulse widths, but also demonstrates a new scheme for generating ultra-short laser with new wavelength through nonlinear frequency mixing.