Efficient cascaded difference frequency conversion in periodically poled Ti:LiNbO3 waveguides using pulsed and cw pumping

Using an FM-mode-locked Ti:Er:LiNbO3 waveguide laser as the fundamental source, wavelength conversion by cascaded chi ((2)) : chi ((2))-difference frequency generation with a conversion efficiency of up to +3 (-4.6) dB was demonstrated at a pulse repetition rate of about 2 (10) GHz. In addition, multichannel conversion was demonstrated with a fully packaged wavelength converter using a continuous fundamental source.