Measurements of picosecond pulse shapes for the highly synchronous cw double mode-locked dye laser

Cross-correlation measurements of the cw double mode-locked dye laser are described for two different cases, showing that the two pulse trains are highly synchronized. A direct display of the pulse shape at the longer wavelength resulted for the first case, in which a short primary pulse was generated along with a much longer incompletely mode-locked secondary pulse. For the second case, both pulse trains were completely mode-locked and short. In each case, the jitter between the two pulse trains was less than 1.6 ps and there was zero delay between the two pulses.