High repetition rate by multiple colliding pulse mode-locked operation of a semiconductor laser

Abstract

The multiple colliding pulse operation where 2, 3 or 4 ultrashort pulses are present simultaneously within a laser resonator is discussed both experimentally and theoretically. In 4 pulse operation, pulse widths of 1.3 ps at repetition rates of 240 GHz have been observed from a 600 /spl mu/m long laser.