Interpulse coherence of picosecond pulses from semiconductor lasers

The interpulse coherence of picosecond pulses from semiconductor lasers has been studied using dynamic interferometric measurements of both first- and second-order correlation functions. The investigations were performed on solitary, injection locked, and external cavity operated buried optical guide lasers. The highest correlations were obtained using mode locking, while no average phase memory between pulses was observed for a solitary laser. Also, the performance of various stabilization schemes with respect to interpulse coherence is discussed.