Accurate and efficient synchronization of two pulsed radiation sources
(e.g. iwo mode locked lasers) is accomplished in stages. Rough
synchronization is accomplished by synchronizing (for example) the
fundamental repetition rate of the two lasers. Fine synchronization is
accomplished by synchronizing high harmonics of the two lasers. More
accurate synchronization may be accomplished by adding more stages, by
utilizing light out of a nonlinear laser in which the two beams are
crossed, or by utilizing heterodyne beats of the two laser beams. A dc
offset signal may added to the control signal generated by the
synchronization stages.
